title: Spatial bias induced by a non-conflictual task reveals the nature of space perception.
abstract: The aim of the present study was to show that space perception depends on sensori-motor experience. We induced spatial biases by a non-conflictual lateralized sensori-motor task on twenty seven right-handed healthy volunteers (left-to-right readers). After a pre-test and before a post-test, which assessed visuo-motor and perceptual subjective midpoint in line bisection, participants performed a short lateralized pointing task (towards the left or right hemispace). Results indicated that this lateralized pointing task induced deviations towards the stimulated hemispace in both the visuo-motor and the perceptual estimations of the subjective line centre. These spatial biases varied as a function of pointing direction (left or right pointing), spatial location and line lengths. These findings suggest that a preceding non-conflictual lateralized sensori-motor experience influences subsequent space perception. Accordingly, ecological sensori-motor experience could be involved in asymmetric perception exhibited by normal individuals and neglect patients.
authors.affiliation: Laboratoire de Psychologie et NeuroCognition, CNRS-UMR 5105, Grenoble, France. eve.dupierrix@upmf-grenoble.fr
authors.forename: Eve
authors.initials: E
authors.lastname: Dupierrix
authors.forename: David
authors.initials: D
authors.lastname: Alleysson
authors.forename: Théophile
authors.initials: T
authors.lastname: Ohlmann
authors.forename: Sylvie
authors.initials: S
authors.lastname: Chokron
mesh_terms: D000328:Adult; D000704:Analysis of Variance; D015982:Bias; D005260:Female; D007839:Functional Laterality; D006801:Humans; D008297:Male; D019368:Nature; D010775:Photic Stimulation / Q000379:methods; D011597:Psychomotor Performance; D013028:Space Perception / Q000502:physiology*; D013997:Time Factors