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  • 1.
    Aarnio, Mikko
    et al.
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för kirurgiska vetenskaper, Anestesiologi och intensivvård.
    Appel, Lieuwe
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för kirurgiska vetenskaper, Radiologi.
    Fredriksson, Mats
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi. Karolinska Inst, Dept Neurosci, Stockholm, Sweden.
    Gordh, Torsten
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för kirurgiska vetenskaper, Anestesiologi och intensivvård.
    Wolf, Olof
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för kirurgiska vetenskaper, Ortopedi.
    Sörensen, Jens
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för kirurgiska vetenskaper, Radiologi.
    Eriksson, Måns
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Statistiska institutionen.
    Peterson, Magnus
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för folkhälso- och vårdvetenskap, Allmänmedicin och preventivmedicin.
    Linnman, Clas
    Harvard Med Sch, Boston Childrens Hosp, Dept Anesthesiol, Boston, MA USA.
    Visualization of painful inflammation in patients with pain after traumatic ankle sprain using [(11)C]-D-deprenyl PET/CT.2017Ingår i: Scandinavian Journal of Pain, ISSN 1877-8860, E-ISSN 1877-8879, Vol. 17, nr 1, s. 418-424Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    BACKGROUND AND AIMS: Positron emission tomography (PET) with the radioligand [(11)C]-D-deprenyl has shown increased signal at location of pain in patients with rheumatoid arthritis and chronic whiplash injury. The binding site of [(11)C]-D-deprenyl in peripheral tissues is suggested to be mitochondrial monoamine oxidase in cells engaged in post-traumatic inflammation and tissue repair processes. The association between [(11)C]-D-deprenyl uptake and the transition from acute to chronic pain remain unknown. Further imaging studies of musculoskeletal pain at the molecular level would benefit from establishing a clinical model in a common and well-defined injury in otherwise healthy and drug-naïve subjects. The aim of this study was to investigate if [(11)C]-D-deprenyl uptake would be acutely elevated in unilateral ankle sprain and if tracer uptake would be reduced as a function of healing, and correlated with pain localizations and pain experience.

    METHODS: Eight otherwise healthy patients with unilateral ankle sprain were recruited at the emergency department. All underwent [(11)C]-D-deprenyl PET/CT in the acute phase, at one month and 6-14 months after injury.

    RESULTS: Acute [(11)C]-D-deprenyl uptake at the injury site was a factor of 10.7 (range 2.9-37.3) higher than the intact ankle. During healing, [(11)C]-D-deprenyl uptake decreased, but did not normalize until after 11 months. Patients experiencing persistent pain had prolonged [(11)C]-D-deprenyl uptake in painful locations.

    CONCLUSIONS AND IMPLICATIONS: The data provide further support that [(11)C]-D-deprenyl PET can visualize, quantify and follow processes in peripheral tissue that may relate to soft tissue injuries, inflammation and associated nociceptive signaling. Such an objective correlate would represent a progress in pain research, as well as in clinical pain diagnostics and management.

  • 2.
    Aarnio, Mikko
    et al.
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för kirurgiska vetenskaper, Anestesiologi och intensivvård.
    Fredrikson, Mats
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi.
    Lampa, Erik
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska och farmaceutiska vetenskapsområdet, centrumbildningar mm, Uppsala kliniska forskningscentrum (UCR).
    Sörensen, Jens
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för kirurgiska vetenskaper, Radiologi. PET Centre, Department of Medical Imaging, Uppsala University Hospital, Sweden.
    Gordh, Torsten
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för kirurgiska vetenskaper, Anestesiologi och intensivvård.
    Linnman, Clas
    Department of Physical Medicine and Rehabilitation, Spaulding Rehabilitation Hospital, Harvard Medical School, Boston, United States.
    Whiplash injuries associated with experienced pain and disability can be visualized with [11C]-D-deprenyl positron emission tomography and computed tomography2022Ingår i: Pain, ISSN 0304-3959, E-ISSN 1872-6623, Vol. 163, nr 3, s. 489-495Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Knowledge of etiological mechanisms underlying whiplash-associated disorders is incomplete. Localisation and quantification of peripheral musculoskeletal injury and inflammation in whiplash-associated disorders would facilitate diagnosis, strengthen patients' subjective pain reports, and aid clinical decisions, all of which could lead to improved treatment. In this longitudinal observational study, we evaluated combined [11C]-D-deprenyl positron emission tomography and computed tomography after acute whiplash injury and at 6-month follow-up. Sixteen adult patients (mean age 33 years) with whiplash injury grade II were recruited at the emergency department. [11C]-D-deprenyl positron emission tomography and computed tomography, subjective pain levels, self-rated neck disability, and active cervical range of motion were recorded within 7 days after injury and again at 6-month follow-up. Imaging results showed possible tissue injuries after acute whiplash with an altered [11C]-D-deprenyl uptake in the cervical bone structures and facet joints, associated with subjective pain locale and levels, as well as self-rated disability. At follow-up, some patients had recovered and some showed persistent symptoms and reductions in [11C]-D-deprenyl uptake correlated to reductions in pain levels. These findings help identify affected peripheral structures in whiplash injury and strengthen the idea that positron emission tomography and computed tomography detectable organic lesions in peripheral tissue are relevant for the development of persistent pain and disability in whiplash injury.

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  • 3.
    Aarnio, Mikko
    et al.
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för kirurgiska vetenskaper.
    Linnman, Clas
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi.
    Fredrikson, Mats
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi.
    Lampa, Erik
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska och farmaceutiska vetenskapsområdet, centrumbildningar mm, Uppsala kliniska forskningscentrum (UCR).
    Sörensen, Jens
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för kirurgiska vetenskaper, Radiologi. Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för radiologi, onkologi och strålningsvetenskap, Enheten för nuklearmedicin och PET.
    Gordh, Torsten
    Whiplash injuries associated with experienced pain and disability can be visualized with [11C]-D-deprenyl PET/CTManuskript (preprint) (Övrigt vetenskapligt)
    Abstract [en]

    The understanding of etiological mechanisms of whiplash associated disorder is still inadequate. Objective visualization and quantification of peripheral musculoskeletal injury and possible painful inflammation in whiplash associated disorder would facilitate diagnosis, strengthen patients’ subjective pain reports and aid clinical decisions eventually leading to better treatments. In the current study, we further evaluated the potential to use [11C]D-deprenyl PET/CT to visualize inflammation after whiplash injury. Sixteen patients with whiplash injury grade II were recruited at the emergency department and underwent [11C]D-deprenyl PET/CT in the acute phase and at 6 months after injury. Subjective pain levels, self rated neck disability and active cervical range of motion were recorded at each imaging session. Results showed that the molecular aspects of inflammation and possible tissue injuries after acute whiplash injury could be visualized, objectively quantified and followed over time with [11C]-D-deprenyl PET/CT. An altered [11C]D-deprenyl uptake in the cervical bone structures and facet joints was associated with subjective pain levels and self rated disability during both imaging occasions. These findings may contribute to a better understanding of affected peripheral structures in whiplash injury and strengthens the idea that PET/CT detectable organic lesions in peripheral tissue may be relevant for the development of persistent pain and disability in whiplash injury.

    Perspective: This article presents a novel way of objectively visualizing possible structural damage and inflammation that cause pain and disability in whiplash injury. This PET method can bring an advance in pain research and eventually would facilitate the clinical management of patients in pain.

  • 4.
    Abou-Soultan, Diana
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi.
    Att kartlägga högskolestudenters psykiska ohälsa: Enkätanonymitetens effekt på svarsfrekvenser samt sambandet mellan stimatiserade erfarenheter och psykisk hälsa2020Självständigt arbete på avancerad nivå (yrkesexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Tiden för högskolestudier är en avgörande period i många unga människors liv då den utgör en övergång från tonåren till vuxenlivet, och det är under dessa år som många typer av psykisk ohälsa har sin debut. Syftet med denna studie var att utvärdera en pilotenkät som var grunden för en ny forskningsinfrastruktur med syfte att kartlägga och förebygga psykisk ohälsa hos studenter med befintlig ohälsa eller som är i riskgrupp att utveckla psykisk ohälsa, samt behandla psykisk ohälsa via digitala insatser på universitet och högskolor. För att kunna ge behandling där behov identifierats kommer framtida enkäter behöva vara av konfidentiell art. Därför syftade denna studie att undersöka hur olika grader av integritetsintrång påverkar benägenheten hos studenter med stigmatiserande erfarenheter att svara på en enkät om psykisk ohälsa. Studien ämnade också undersöka om det finns ett samband mellan stigmatiserande erfarenheter och psykisk ohälsa i form at substansbruk, våld, suicidalitet och sexuell lägging. Resultaten visar att integritetsintrång inte har någon effekt på studenters benägenhet att svara på frågor av känslig natur. Vidare visar resultaten att det finns ett samband mellan stigmatiserande erfarenheter i form av substansbruk, suicidalitet, våld samt sexuell läggning och psykisk ohälsa i form av överlag upplevd psykisk ohälsa och/eller depression eller ångest under livstiden och de senaste 12 månaderna. 

  • 5.
    Abrahamsson, Niclas
    et al.
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för medicinska vetenskaper.
    Ahlund, Lovisa
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi.
    Ahrin, Elsa
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi.
    Alfonsson, Sven
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för kvinnors och barns hälsa, Forskargrupper (Inst. för kvinnor och barns hälsa), Klinisk psykologi i hälso- och sjukvård.
    Video-based CBT-E improves eating patterns in obese patients with eating disorder: A single case multiple baseline study2018Ingår i: Journal of Behavior Therapy and Experimental Psychiatry, ISSN 0005-7916, E-ISSN 1873-7943, Vol. 61, s. 104-112Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    BACKGROUND AND OBJECTIVES:

    Cognitive Behavioral Therapy (CBT) is effective for treating eating disorders but it may be difficult to reach patients living far from urban centers. Mobile video-based psychotherapy may potentially improve service reach but has not yet been evaluated. The purpose of this study was to investigate the effects of mobile video-based CBT for eating disorder and to explore the feasibility to use this technology in clinical care.

    METHODS:

    A controlled single case multiple baseline design was used which allowed for statistical analyses with randomization tests and non-overlap of all pairs (NAP). Five patients in the first stage of eating disorder treatment were included and the main outcome variable was daily meal frequency. Secondary outcome variables included eating disorder symptoms, psychological distress and treatment satisfaction.

    RESULTS:

    The treatment resulted in a significant (p < .01) increase in daily meal frequency with medium to large effect sizes (combined NAP = .89). Four participants reported reliable improvements in eating disorder symptoms and three reported improvements in mood. The participants reported high satisfaction with the treatment and with the mobile video-application despite some technical problems.

    LIMITATIONS:

    Self-reported data on eating behavior is prone to be biased and the results of single case studies may have limited generalizability.

    CONCLUSION:

    CBT can be delivered effectively via a mobile video application and, despite some technological issues, can be well received by patients. All participants in this study had previous low access to mental health services and reported high satisfaction with the treatment format.

  • 6.
    Abu-Quota, Nedal
    et al.
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi.
    Silfverhammar, Eva
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi.
    Effekt av musik på bedömningar av attraktivitet2021Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Musik väcker olika emotioner inom oss som bidrar till arousal. Tidigare studier har fått blandade resultat när de försökt visa att arousal från musik leder till att vi finner varandra mer attraktiva. Denna studie ämnar visa att musiken påverkar vid bedömningen av andras attraktion. Ett kvasi-experiment genomfördes med oberoende variablerna musik och kön med vardera två lägen samt den beroende variabeln attraktion. Deltagarna i experimentgruppen fick svara på en enkät och skatta 15 bilder på motsatt kön samtidigt som de lyssnade på en låt från topplistan. Låten valdes utifrån arousal och valence enligt Circumplex-modellen som systematiserar emotioner (Russel, 1980). Kontrollgruppen svarade på samma enkät men utan musik. Resultatet visar på en icke signifikant huvudeffekt av musik, en icke signifikant interaktionseffekt av kön och musik. Studien visade ingen signifikant effekt av musikalisk erfarenhet på skattad attraktivitet.

  • 7. Achard, B.
    et al.
    von Hofsten, Claes
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi.
    Development of the infant's ability to retrieve food through a slit2002Ingår i: Infant and Child Development, ISSN 1522-7227, E-ISSN 1522-7219, Vol. 11, nr 1, s. 43-56Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The main purpose of the present study is to explore infants' ability to comprehend task manipulation, and whether they can feed themselves with a spoon when food has to be retrieved through a slit in a lid placed over a plate. To access the food, the infant has to align the bowl of the spoon with the slit. The orientation of the slit is manipulated, and certain orientations require more elaborate modifications of the feeding action than others. The infants are observed at monthly intervals, from 12 to 17 months of age. The presence of the lid affects the behaviour of the infants at all ages. Some behaviours become more immature. The infants grasp the spoon with more primitive grasp configurations, they grasp the spoon less consistently at the top of the handle, and they orient the spoon less consistently, with its bowl facing upwards. These differences decrease with age. The infants also make attempts to adjust to the constraints of the task, mainly by inclining the spoon more vertically, and rotating the hand in such a way as to align the spoon with the orientation of the slit. These adjustments improve with age.

  • 8. Achard, Benedicte
    et al.
    von Hofsten, Claes
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi.
    Development of the Infant’sAbility to Retrieve Food Througha Slit2002Ingår i: Infant and Child Development, ISSN 1522-7227, E-ISSN 1522-7219, Vol. 11, s. 43-56Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The main purpose of the present study is to explore infants’ability to comprehend task manipulation, and whether they canfeed themselves with a spoon when food has to be retrievedthrough a slit in a lid placed over a plate. To access the food, theinfant has to align the bowl of the spoon with the slit. Theorientation of the slit is manipulated, and certain orientationsrequire more elaborate modifications of the feeding action thanothers. The infants are observed at monthly intervals, from 12 to17 months of age. The presence of the lid affects the behaviourof the infants at all ages. Some behaviours become more immature.The infants grasp the spoon with more primitive graspconfigurations, they grasp the spoon less consistently at the topof the handle, and they orient the spoon less consistently, withits bowl facing upwards. These differences decrease with age.The infants also make attempts to adjust to the constraints of thetask, mainly by inclining the spoon more vertically, and rotatingthe hand in such a way as to align the spoon with the orientationof the slit. These adjustments improve with age.

  • 9.
    Achermann, Sheila
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi.
    Prediction in Typical and Atypical Development2020Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
    Abstract [en]

    Forming predictions about what is going to happen next is a crucial ability that develops early in life. Theory and some empirical evidence suggest that predictive abilities may be impaired in Autism Spectrum Disorder (ASD). The overarching aim of this thesis is to investigate early measures of prediction in relation to concurrent and later outcomes in typical and atypical development, with a particular focus on ASD and related behavioral problems.

    In Study I, we used motion capture technology to examine prospective motor control and its relationship to executive functions in typically developing 18-month-olds. Our findings showed that motor control is associated with executive functioning in infancy.

    Study II investigated motor control in infants at low and elevated likelihood for ASD and examined how these measures relate to later development. We found group differences as well as similarities in motor control in 10-months-olds with and without a familial history of ASD. Early motor measures were related to general developmental level, but not ASD symptomatology in toddlerhood.

    Using eye tracking, Study III examined how infants with later ASD and neurotypical infants form predictions about visual object motion. Our findings indicated that infants with later ASD were able to form predictions about object motion and adapt to simple changes in motion patterns, and that their performance did not differ from the performance of neurotypical infants.

    In Study IV, we surveyed parents about their experiences during participation in an infant sibling study of ASD as a first step to understanding the benefits and risks associated with this type of research. Parents were generally positive about their experiences both from their own perspective as well as, the child’s perspective.

    This thesis illustrates the potential of using advanced technology, such as motion tracking and eye tracking, to study and compare prediction in typical and atypical development. It points to the important role of prediction and motor control for child development, but fails to find a specific link to ASD.

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  • 10.
    Achermann, Sheila
    et al.
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi.
    Bolte, Sven
    Karolinska Inst & Reg Stockholm, Dept Womens & Childrens Hlth, Ctr Psychiat Res, Karolinska Inst KIND,Ctr Neurodev Disorders, Stockholm, Sweden;Curtin Univ, Sch Occupat Therapy Social Work & Speech Pathol, Essential Partner Autism CRC, Curtin Autism Res Grp, Perth, WA, Australia.
    Falck-Ytter, Terje
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi. Uppsala universitet, Kollegiet för avancerade studier (SCAS). Karolinska Inst & Reg Stockholm, Dept Womens & Childrens Hlth, Ctr Psychiat Res, Karolinska Inst KIND,Ctr Neurodev Disorders, Stockholm, Sweden.
    Parents' experiences from participating in an infant sibling study of autism spectrum disorder2020Ingår i: Research in Autism Spectrum Disorders, ISSN 1750-9467, E-ISSN 1878-0237, Vol. 69, artikel-id 101454Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Background:

    Prospective longitudinal studies of infant siblings of children with autism spectrum disorder (ASD) play an important role in advancing our knowledge about early developmental pathways in ASD. Despite this clear benefit, currently little is known about potential risks or disadvantages for participating families. As a first step in addressing this issue, we asked parents about their experiences from participating in an infant sibling study.

    Method:

    Eighty-eight families responded to a questionnaire examining parents' experiences from participating in an infant sibling study. The questions assessed parents' satisfaction with the study, the child's perceived satisfaction, and the parents' motivation for participating. The study included parents of two groups, (1) infants with an older sibling diagnosed with ASD (HR, high risk, n = 43) and (2) infants with no familial history of ASD (LR, low risk, n = 21).

    Results:

    The results indicated that parents are generally positive about study participation and few disadvantages were reported. This pattern was mirrored when splitting parents' responses into the two groups. There was no indication for group differences between parents of infants at high risk and low risk for ASD.

    Conclusion:

    Our findings present a first step into understanding parents' experiences from participating in an infant sibling study. Most parents were satisfied with participation in the study and only few disadvantages were reported. Our results have implications for ethical discussions about benefits and risks regarding infant sibling studies in various fields.

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  • 11.
    Achermann, Sheila
    et al.
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi.
    Falck-Ytter, Terje
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi. Uppsala universitet, Kollegiet för avancerade studier (SCAS). Center of Neurodevelopmental Disorders (KIND), Centre for Psychiatry Research, Department of Women’s and Children’s Health, Karolinska Institutet, Stockholm, Sweden.
    Bölte, Sven
    Nyström, Pär
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi.
    Updating Expectations about Unexpected Object Motion in Infants Later Diagnosed with Autism Spectrum Disorder2021Ingår i: Journal of autism and developmental disorders, ISSN 0162-3257, E-ISSN 1573-3432, Vol. 51, nr 11, s. 4186-4198Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In typical development, infants form predictions about future events based on incoming sensory information, which is essential for perception and goal-directed action. It has been suggested that individuals with autism spectrum disorder (ASD) make predictions differently compared to neurotypical individuals. We investigated how infants who later received an ASD diagnosis and neurotypical infants react to temporarily occluded moving objects that violate initial expectations about object motion. Our results indicate that infants regardless of clinical outcome react similarly to unexpected object motion patterns, both in terms of gaze shift latencies and pupillary responses. These findings indicate that the ability to update representations about such regularities in light of new information may not differ between typically developing infants and those with later ASD.

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  • 12.
    Achermann, Sheila
    et al.
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi.
    Nyström, Pär
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi.
    Bölte, Sven
    Karolinska Institutet, Sweden; Stockholm County Council, Sweden; Curtin University, Australia.
    Falck-Ytter, Terje
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi. Uppsala universitet, Kollegiet för avancerade studier (SCAS). Karolinska Institutet, Sweden; Stockholm County Council, Sweden.
    Motor atypicalities in infancy are associated with general developmental level at 2 years, but not autistic symptoms2020Ingår i: Autism, ISSN 1362-3613, E-ISSN 1461-7005, Vol. 24, nr 7, s. 1650-1663Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Atypical motor development has frequently been reported in infants at elevated likelihood for autism spectrum disorder. However, no previous study has used detailed motion capture technology to compare infant siblings of children with autism spectrum disorder and infant siblings with no familial history of autism spectrum disorder. We investigated reaching movements during an interceptive action task in 10-month-old infants using kinematic data with high spatiotemporal resolution. The results indicated that several measures were different in infants at elevated likelihood. However, longitudinal analyses revealed that while specific infant motor measures (e.g. number of movement units) were related to broad measures of general developmental level in toddlerhood, the associations with later autism spectrum disorder symptomatology were not significant. These findings confirm that some aspects of motor functioning are atypical in infants at elevated likelihood for autism spectrum disorder, but provide no support for the view that these issues are specifically linked to autism spectrum disorder symptoms, but may rather reflect neurodevelopment more generally.Lay abstractAtypicalities in motor functioning are often observed in later born infant siblings of children with autism spectrum disorder. The goal of our study was to investigate motor functioning in infants with and without familial history of autism spectrum disorder. Specifically, we investigated how infants catch a ball that is rolling toward them following a non-straight path, a task that requires both efficient planning and execution. Their performance was measured using detailed three-dimensional motion capture technology. We found that several early motor functioning measures were different in infants with an older autistic sibling compared to controls. However, these early motor measures were not related to autistic symptoms at the age of 2 years. Instead, we found that some of the early motor measures were related to their subsequent non-social, general development. The findings of our study help us understand motor functioning early in life and how motor functioning is related to other aspects of development.

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  • 13.
    Achermann, Sheila
    et al.
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi.
    Nyström, Pär
    Bölte, Sven
    Falck-Ytter, Terje
    Motor Atypicalities in Infancy are Associated with General Developmental Level at Two Years, but Not Autistic SymptomsIngår i: Artikel i tidskrift (Refereegranskat)
  • 14.
    Achermann, Sheila
    et al.
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi.
    Nyström, Pär
    Gredebäck, Gustaf
    Bölte, Sven
    Falck-Ytter, Terje
    Characterizing Motor Functioning in Infants at Risk for Autism Spectrum Disorder Using Motion Capture Technology2018Konferensbidrag (Refereegranskat)
  • 15.
    Adam, Maurits
    et al.
    Univ Potsdam, Dept Psychol, Karl Liebknecht Str 24-25, D-14476 Potsdam, Germany..
    Reitenbach, Ivanina
    Euro FH Univ Appl Sci, Dept Psychol, Hamburg, Germany..
    Papenmeier, Frank
    Univ Tubingen, Dept Psychol, Tubingen, Germany..
    Gredebäck, Gustaf
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi.
    Elsner, Claudia
    Max Planck Inst Human Dev, Max Planck Res Grp Naturalist Social Cognit, Berlin, Germany..
    Elsner, Birgit
    Univ Potsdam, Dept Psychol, Karl Liebknecht Str 24-25, D-14476 Potsdam, Germany..
    Goal saliency boosts infants' action prediction for human manual actions, but not for mechanical claws2016Ingår i: Infant Behavior and Development, ISSN 0163-6383, E-ISSN 1879-0453, Vol. 44, s. 29-37Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Previous research indicates that infants' prediction of the goals of observed actions is influenced by own experience with the type of agent performing the action (i.e., human hand vs. non-human agent) as well as by action-relevant features of goal objects (e.g., object size). The present study investigated the combined effects of these factors on 12-month-olds' action prediction. Infants' (N=49) goal-directed gaze shifts were recorded as they observed 14 trials in which either a human hand or a mechanical claw reached for a small goal area (low-saliency goal) or a large goal area (high-saliency goal). Only infants who had observed the human hand reaching for a high-saliency goal fixated the goal object ahead of time, and they rapidly learned to predict the action goal across trials. By contrast, infants in all other conditions did not track the observed action in a predictive manner, and their gaze shifts to the action goal did not change systematically across trials. Thus, high-saliency goals seem to boost infants' predictive gaze shifts during the observation of human manual actions, but not of actions performed by a mechanical device. This supports the assumption that infants' action predictions are based on interactive effects of action-relevant object features (e.g., size) and own action experience.

  • 16.
    af Wåhlberg, Anders
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi.
    Sammanfattning av resultaten från projektet Sparsam körning: longitudinella effekter av utbildning och information via displayenhet.2004Rapport (Övrigt vetenskapligt)
  • 17.
    af Geijerstam, Åsa
    et al.
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Språkvetenskapliga fakulteten, Institutionen för lingvistik och filologi.
    Björk, Oscar
    Engblom, Charlotte
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Fakulteten för utbildningsvetenskaper, Institutionen för pedagogik, didaktik och utbildningssociologi.
    Wiksten Folkeryd, Jenny
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Fakulteten för utbildningsvetenskaper, Institutionen för pedagogik, didaktik och utbildningssociologi.
    Hort, Sofia
    Liberg, Caroline
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Fakulteten för utbildningsvetenskaper, Institutionen för pedagogik, didaktik och utbildningssociologi.
    Norrman, Kimberly
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Fakulteten för utbildningsvetenskaper, Institutionen för pedagogik, didaktik och utbildningssociologi.
    Westman, Maria
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Fakulteten för utbildningsvetenskaper, Institutionen för pedagogik, didaktik och utbildningssociologi.
    Rasmusson, Maria
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi.
    Praktiknära skolforskning: resultat och erfarenheter från nio forskningsprojekt2024Rapport (Övrigt vetenskapligt)
  • 18. af Wahlberg, A. E.
    et al.
    Poom, Leo
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi.
    An Empirical Test of Nonresponse Bias in Internet Surveys2015Ingår i: Basic and Applied Social Psychology, ISSN 0197-3533, E-ISSN 1532-4834, Vol. 37, nr 6, s. 336-347Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In surveys, nonresponse is considered a source of possible bias, which increases with the size of the nonresponding group. Nonresponse bias was investigated in 3 samples of offending drivers who were required to respond to an online questionnaire before taking a driver improvement course, creating an initial 100% response rate. The next 2 questionnaire waves were voluntary, and response rates were much lower. Results (means, internal consistency, correlations, etc.) in the first wave were compared between those who responded twice or thrice and those who responded only to the first wave. No substantial differences were found. Compared to common method variance, the effects of nonresponse are very small.

  • 19.
    af Wåhlberg, A. E.
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi.
    Att mäta effekter av utbildning i sparsam körning2002Ingår i: Transportforum 2002, Väg- och transportforskningsinstitutet , 2002Konferensbidrag (Övrigt vetenskapligt)
  • 20.
    af, Wåhlberg. A. E.
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi.
    Fuel efficient driving training - state of the art and quantification of effects2002Ingår i: Proceedings of Soric'02, Center for Transport and Road Studies, University of Bahrain, Kingdom of Bahrain , 2002Konferensbidrag (Refereegranskat)
  • 21.
    af Wåhlberg, A. E.
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi.
    On the validity of self-reported traffic accident data2002Ingår i: E140 Proceedings of Soric'02, Center for Transport and Road Studies, University of Bahrain, Kingdom of Bahrain , 2002Konferensbidrag (Refereegranskat)
  • 22.
    af Wåhlberg, A.E.
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi.
    How managers can influence professional drivers' accident rate2007Övrigt (Övrigt vetenskapligt)
  • 23.
    af Wåhlberg, A.E.
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi.
    Making bad look good: The scientific claims of Interactive Driving Systems2007Övrigt (Övrigt vetenskapligt)
  • 24.
    af Wåhlberg, AE
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi.
    Trafiksäkerhetseffekter av ökad storlek på lastbilar.2007Rapport (Övrigt vetenskapligt)
  • 25.
    af Wåhlberg, A.E.
    et al.
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi.
    Göthe, Johan
    Fuel wasting behaviors of truck drivers2007Ingår i: Industrial Psychology Research Trends, New York: Nova Science Publishers , 2007, s. 73-87Kapitel i bok, del av antologi (Övrigt vetenskapligt)
  • 26.
    af Wåhlberg, AE
    et al.
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi.
    Melin, Lennart
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi.
    Driver celeration behavior in training and regular driving.2007Ingår i: Driver Behaviour and Training, Volume III, 2007Konferensbidrag (Övrigt vetenskapligt)
  • 27.
    af Wåhlberg, A.E.
    et al.
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi.
    Melin, Lennart
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi.
    Driver celeration behavior in training and regular driving2008Ingår i: Driver Behaviour and Training, Volume III:  Third International Conference on Driver Behaviour and Training. Dublin 12-13 November, 2007., Aldershot: Ashgate , 2008, s. 189-199Konferensbidrag (Övrigt vetenskapligt)
  • 28.
    af Wåhlberg, Anders
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi.
    Changes in Driver Celeration Behavior over Time: do Drivers Learn from Collisions?2012Ingår i: Transportation Research Part F: Traffic Psychology and Behaviour, ISSN 1369-8478, E-ISSN 1873-5517, Vol. 15, nr 5, s. 471-479Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Although it is well known that drivers’ accident risk changes with experience, it has never been specified exactly how this comes about in terms of changes of behaviour, or what features of their experiences are important for this change. One possibility is that drivers learn from their collision involvement, and change their behaviour after such events, as some studies indicate. However, relative accident involvement tends to be very stable over time, which indicates the opposite. Repeated measurements of celeration (speed change) behaviour of bus drivers were compared between two groups; drivers without accidents within the measurement period (about 3 years), and drivers with at least one crash. For the crash group, there was a steady decline in their celeration values over time, but this was not related to their crashes. A similar reduction was also present for the non-crash sample. The results would seem to be in agreement with the theory of accident proneness; there exist stability in driver behaviour over time, despite accident involvement. However, this stability is relative within the sample, and not absolute. The reduction in celeration values for both groups over time would seem to indicate that drivers learn from their experiences in general, but not specifically from accidents. The present study seems to indicate that daily experience of driving situations is the strongest factor for changes in driving behaviour.

  • 29.
    af Wåhlberg, Anders
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi.
    Characteristics of low speed accidents with buses in public transport. Part II.2004Ingår i: Accident Analysis and Prevention, Vol. 36, s. 63-71Artikel i tidskrift (Refereegranskat)
  • 30.
    af Wåhlberg, Anders
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi.
    Differential accident involvement of bus drivers2005Ingår i: Driver Behaviour and Training: Volume II / [ed] Lisa Dorn, Aldershot: Ashgate , 2005, s. 383-391Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    The relations between 552 bus drivers' low-speed traffic incidents (without consideration of culpability) and their age, exposure (hours of work) and experience (years as a bus driver) were calculated using bus company data from the Swedish city of Uppsala for the years 1999-2003. It was found that risk decreases with age and experience, with experience as the strongest factor, carrying the effect. Exposure (hours worked) had a curvilinear association to accidents. Also, the use of accidents per work hour yielded more easily interpreted results than the absolute number, indicating the importance of taking exposure into account when predicting accidents. These results are mainly in agreement with previous studies on other road user groups. However, two different ways of calculating age effects (individual and group level) gave somewhat different results, indicating that a fairly popular method of calculating risk indexes may be faulty. Furthermore, time for holding a car driver's license did not influence bus accident liability, despite being strongly correlated with age, indicating that bus driving is separate from car driving experience. Also, the extremely small amount of variance accounted for by experience and age point to the importance of other factors, although there seem to be a strong effect during the first years of driving, which thereafter levels off.

  • 31.
    af Wåhlberg, Anders
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi.
    Driver Behaviour and Accident Research Methodology: Unresolved Problems2009Bok (Övrigt vetenskapligt)
  • 32.
    af Wåhlberg, Anders
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi.
    Driver celeration behavior and accidents - an analysis2008Ingår i: Theoretical Issues in Ergonomics Science, ISSN 1463-922X, E-ISSN 1464-536X, Vol. 9, s. 383-403Artikel i tidskrift (Refereegranskat)
  • 33.
    af Wåhlberg, Anders
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi.
    Driver celeration behavior and the prediction of traffic accidents2006Ingår i: International Journal of Occupational Safety and Ergonomics, ISSN 1080-3548, E-ISSN 2376-9130, Vol. 12, nr 3, s. 281-296Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A study was undertaken to investigate whether driver celeration (overall mean speed change) behavior can predict traffic accident involvement. Also, to test whether acceleration, deceleration or the combined celeration measure was the better predictor. Bus driver celeration behavior was measured repeatedly in real traffic, driving en route, and correlated with accidents for which the drivers were deemed at least partly responsible. Correlations around. 20 were found in several samples between celeration behavior and culpable accidents for a 2-year period. The results show that although celeration behavior is only semi-stable over time, it predicts with some accuracy individual accident involvement over 2 years. The predictive power of acceleration and deceleration was slightly lower than the combined measure, in accordance with theory. The correlations found were strong enough to warrant the use of celeration behavior as a predictive variable for transportation companies in their safety work.

  • 34.
    af Wåhlberg, Anders
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi.
    Driver research myths2010Ingår i: Fourth International Conference on Driver Behaviour and Training / [ed] Lisa Dorn, Aldershot: Ashgate , 2010, s. 3-6Konferensbidrag (Övrigt vetenskapligt)
  • 35.
    af Wåhlberg, Anders
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi.
    Fuel-efficient driving research: an area in need of exploration2007Ingår i: Industrial Psychology Research Trends, New York: Nova Science Publishers , 2007, s. 5-8Kapitel i bok, del av antologi (Övrigt vetenskapligt)
  • 36.
    af Wåhlberg, Anders
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi.
    Hourly changes in accident risk for bus drivers2009Ingår i: Journal of Risk Research, ISSN 1366-9877, E-ISSN 1466-4461, Vol. 12, nr 2, s. 187-197Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Traffic accident risk has in some studies been found to change with the time of day, after controlling for exposure, probably due to diurnal changes in the human body, which changes alertness. However, exposure data are not always of good quality, and culpability for accidents is not always taken into account. The change in culpable accident risk over the day for bus drivers was therefore investigated, with single accidents analysed separately, using induced exposure (non-culpable bus accidents) as well as general traffic density and number of buses on the road as controlling factors. It was found that the risk distribution was fairly similar to some previous results before controlling for exposure, but dissimilar to other, probably indicating that bus drivers have a somewhat different risk profile, but also that previous studies may not have controlled for exposure in a reliable way. When exposure was held constant, the risk distribution was different from all other studies. The three different exposure measures correlated strongly between themselves, and each would seem to be adequate for a basic control. However, although general traffic density was most strongly correlated with culpable bus accidents, the induced exposure parameter added some explained variance. Single accidents had a very different risk distribution as compared to other culpable accidents when exposure had been held constant. A number of unexpected effects were also noted, mainly that single accidents were associated most strongly with general traffic density.

  • 37.
    af Wåhlberg, Anders
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi.
    Memory effects in self-reports of crashes2012Ingår i: Driver Behaviour and Training, Volume V / [ed] L. Dorn, 2012, Vol. V, s. 283-288Konferensbidrag (Refereegranskat)
  • 38.
    af Wåhlberg, Anders
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi.
    Re-education of young driving offenders: Effects on recorded offences and self-reported collisions2011Ingår i: Transportation Research Part F: Traffic Psychology and Behaviour, ISSN 1369-8478, E-ISSN 1873-5517, Vol. 14, nr 4, s. 291-299Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    New ways of educating offending drivers are being introduced, notably e-learning. This type of education has rarely been tested for its safety effects before. An e-learning course for offending young drivers was therefore evaluated as to its effects upon offence and self-reported collision rates. Significant reductions in number of offences and penalty points were found for an e-learning group, while this was not the case for drivers who had been fined only, or had taken a more traditional solely class-room based educational scheme. The e-learners also reported a larger reduction in collision involvement than a random control group, although a regression to the mean effect could not be ruled out. The results seem to indicate a positive effect of the e-learning course for young driving offenders. This conclusion, however, is to be interpreted in relation to the weak association between penalty points and collisions, and the low validity of self-reported collision involvement data. The present results lend further support to the use of e-learning driver improvement courses, although the most important type of data, recorded collisions, is still missing.

  • 39.
    af Wåhlberg, Anders
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi.
    Short-term effects of training in economical driving; passenger comfort and driver acceleration behavior2006Ingår i: International Journal of Industrial Ergonomics, Vol. 36, s. 151-163Artikel i tidskrift (Refereegranskat)
  • 40.
    af Wåhlberg, Anders
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi.
    Social desirability effects in driver behavior inventories2010Ingår i: Journal of Safety Research, ISSN 0022-4375, E-ISSN 1879-1247, Vol. 41, nr 2, s. 99-106Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Problem: The use of lie scales to control for common method variance in driver behavior inventories has been very limited. Given that such questionnaires often use self-reported safety variables as criteria, and have social implications, the risk of artefactual associations is high. Method: A questionnaire containing scales from several well known driver inventories that have been claimed to predict traffic accident involvement was distributed three times to a group of young drivers in a driver education program, as well as a random group twice. The Driver Impression Management scale (DIM) was used to control for socially desirable responding. Results: For all behavior scales, the correlation with the DIM scale was substantial. If a scale correlated with self-reported crashes, the amount of predictive power was more than halved when social desirability was controlled for. Results were similar for both samples and all waves. The predictive power of the behavior scales was not increased when values were averaged over questionnaire waves, as should have been the case if the measurement and predictive power were valid. Results were similar for self-reported penalty points. The present results indicate that even the most well-known and accepted psychometric scales used in driver research are susceptible to social desirability bias. Discussion: As social desirability is only one of a number of common method variance mechanisms that can create artefactual associations, and the great popularity of the self-report methodology, the problem for traffic research is grave. Impact on industry: Organizations that fund traffic safety research need to re-evaluate their policies regarding what methods are acceptable. The use of self-reported independent and dependent variables can lead to directly misleading results, with negative effects on traffic safety.

  • 41.
    af Wåhlberg, Anders
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi.
    Some methodological deficiencies in studies on traffic accident predictors2003Ingår i: Accident Analysis and Prevention, Vol. 35, s. 473-486Artikel i tidskrift (Refereegranskat)
  • 42.
    af Wåhlberg, Anders
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi.
    Speed choice versus celeration behavior as traffic accident predictor.2006Ingår i: Journal of Safety Research, Vol. 37, s. 43-51Artikel i tidskrift (Refereegranskat)
  • 43.
    af Wåhlberg, Anders
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi.
    Stability and correlates of driver acceleration behaviour2003Ingår i: Driver Behaviour and Training. First International Conference on Driver Behaviour and Training. Stratford-upon-Avon 11-12 November, 2003., 2003, s. 45-54Konferensbidrag (Övrigt vetenskapligt)
  • 44.
    af Wåhlberg, Anders
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi.
    The Prediction of Traffic Accident Involvement from Driving Behavior2006Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
    Abstract [en]

    The aim of the studies was to predict individual traffic accident involvement by the quantification of driving style in terms of speed changes, using bus drivers as subjects. An accident database was constructed from the archives of the bus company whose drivers were used as subjects. The dependent variable was also discussed regarding whether responsibility for crashes should be included, and what time period to use for optimal prediction. A new theory was constructed about how accidents are caused by driver behavior, more specifically the control movements of the driver, i.e. all actions taken which influence the relative motion of the vehicle in a level plane when v>0. This theory states that all traffic safety related behavior can be measured as celerations (change of speed of the vehicle in any direction of a level plane) and summed. This theoretical total sum is a measure of a person's liability to cause accidents over the same time period within a homogenous traffic environment and a similarly homogenous driving population. Empirically, the theory predicts a positive correlation between mean driver celeration behavior and accident record. The theory was tested in three empirical studies. The first tested equipment and methods, the second studied the question whether driver celeration behavior is stable over time. Celeration behavior turned out to be rather variable between days, and repeated measurements were therefore needed to stabilize the measure. In the third study, a much larger amount of data brought out correlations of sizes sufficient to lend some credibility to the theory. However, the predictive power did not extend beyond two years of time. The reported results would seem to imply that the celeration variable can predict accident involvement (at least for bus drivers), and is practical to use, as it is easily and objectively measured and semi-stable over time.

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  • 45.
    af Wåhlberg, Anders
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi.
    The relation of acceleration force to traffic accident frequency: A pilot study2000Ingår i: Transportation Research Part F: Traffic Psychology and Behaviour, Vol. 3, s. 29-38Artikel i tidskrift (Refereegranskat)
  • 46.
    af Wåhlberg, Anders
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi.
    The relation of non-culpable traffic incidents to bus drivers' celeration behavior2008Ingår i: Journal of Safety Research, ISSN 0022-4375, E-ISSN 1879-1247, Vol. 39, nr 1, s. 41-46Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Problem: The driver celeration behavior theory predicts that celerations are associated with incidents for which the driver has some responsibility in causing, but not other incidents. Method: The hypothesis was tested in 25 samples of repeated measurements of bus drivers' celeration behavior against their incidents for two years. Results: The results confirmed the prediction; in 18 samples, the correlation for culpable incidents only was higher than for all incidents, despite the higher means of the latter. Non-culpable incidents had correlations close to zero with celeration. Discussion: It was pointed out that most individual crash prediction studies have not made this differentiation, and thus probably yielded underestimates of the associations sought, although the effect is not strong, due to non-culpable accident involvements being few (less than a third of the total). The methods for correct identification of culpable incident involvements were discussed.

  • 47.
    af Wåhlberg, Anders
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi.
    The stability of driver acceleration behavior, and a replication of its relation to bus accidents2004Ingår i: Accident Analysis and Prevention, Vol. 36, s. 83-92Artikel i tidskrift (Refereegranskat)
  • 48.
    af Wåhlberg, Anders
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi.
    The stability of driver acceleration behavior, and a replication of its relation to bus accidents2004Ingår i: Accident Analysis and Prevention, Vol. 36, s. 83-92Artikel i tidskrift (Refereegranskat)
  • 49.
    af Wåhlberg, Anders
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi.
    Trafiksäkerhetseffekter av ökad storlek på lastbilar2007Rapport (Övrigt vetenskapligt)
  • 50.
    af Wåhlberg, Anders E.
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi.
    Long-term effects of training in economical driving: Fuel consumption, accidents, driver acceleration behavior and technical feedback2007Ingår i: International Journal of Industrial Ergonomics, ISSN 0169-8141, E-ISSN 1872-8219, Vol. 37, nr 4, s. 333-343Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The effects of training in fuel-efficient driving for bus drivers in a city environment were evaluated. Three dependent variables, hypothetically associated with such training, were used; fuel and accident data from the bus company, and driver acceleration behavior from five buses, over time periods of several years. Effects of temperature and number of passengers on fuel consumption were held constant. Fuelling and acceleration data yielded fairly similar results. It was found that, although the effects on these variables during training were very strong (as found in a previous study), these did not transfer well into the drivers' working situation. Overall, the effect was about two percent fuel consumption reduction as a mean over 12 months after training. No effect was found for accidents, although a two percent reduction would not have been detectable. In a second phase of the study, 28 buses were equipped with Econen feedback equipment, which give an indication on how much fuel is used concurrently, resulting in a further reduction of consumption of about two percent.

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