title: Reduced sensitivity to minimum-jerk biological motion in autism spectrum conditions.
abstract: We compared psychophysical thresholds for biological and non-biological motion detection in adults with autism spectrum conditions (ASCs) and controls. Participants watched animations of a biological stimulus (a moving hand) or a non-biological stimulus (a falling tennis ball). The velocity profile of the movement was varied between 100% natural motion (minimum-jerk (MJ) for the hand; gravitational (G) for the ball) and 100% constant velocity (CV). Participants were asked to judge which animation was 'less natural' in a two-interval forced-choice paradigm and thresholds were estimated adaptively. There was a significant interaction between group and condition. Thresholds in the MJ condition were lower than in the G condition for the NC group whereas there was no difference between the thresholds in the two conditions for the ASC group. Thus, unlike the controls, the ASC group did not show an increased sensitivity for perturbation to biological over non-biological velocity profiles.
authors.affiliation: UCL Institute of Cognitive Neuroscience, 17 Queen Square, London WC1N3AR, UK.
authors.forename: Jennifer
authors.initials: J
authors.lastname: Cook
authors.forename: Ayse Pinar
authors.initials: AP
authors.lastname: Saygin
authors.forename: Rachel
authors.initials: R
authors.lastname: Swain
authors.forename: Sarah-Jayne
authors.initials: SJ
authors.lastname: Blakemore
mesh_terms: D000328:Adult; D001321:Autistic Disorder / Q000150:complications*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009039:Motion Perception / Q000502:physiology*; D009068:Movement / Q000502:physiology*; D019370:Observation; D010468:Perceptual Disorders / Q000209:etiology*; D010775:Photic Stimulation / Q000379:methods; D011597:Psychomotor Performance / Q000502:physiology*; D011601:Psychophysics; D012684:Sensory Thresholds / Q000502:physiology; D055815:Young Adult