Neural correlates of visual-motion perception as object- or self-motion.

Détails

ID Serval
serval:BIB_518EB4712EA1
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Neural correlates of visual-motion perception as object- or self-motion.
Périodique
Neuroimage
Auteur⸱e⸱s
Kleinschmidt A., Thilo K.V., Büchel C., Gresty M.A., Bronstein A.M., Frackowiak R.S.
ISSN
1053-8119 (Print)
ISSN-L
1053-8119
Statut éditorial
Publié
Date de publication
2002
Volume
16
Numéro
4
Pages
873-882
Langue
anglais
Notes
Publication types: Journal Article ; Research Support, Non-U.S. Gov'tPublication Status: ppublish
Résumé
Both self-motion and objects moving in our visual field generate visual motion by displacing images on the retina. Resolving this ambiguity may seem effortless but large-field visual-motion stimuli can yield perceptual rivalry between the real percept of object-motion and the illusory percept of self-motion (vection). We used functional magnetic resonance imaging to record brain activity in human observers exposed to constant-velocity roll-motion. This stimulus induced responses in areas reaching from calcarine to parieto-occipital and to ventral and lateral temporo-occipital cortex and the anterior insula. During vection, early motion-sensitive visual areas and vestibular parieto-insular cortex deactivated, whereas higher-order parieto- and temporo-occipital areas known to respond to optical flow retained identical activity levels. Within this sustained response, these latter areas displayed transient activations in response to each perceptual switch as identified in event-related analyses. Our results thus show that these areas are responsive to the type of visual motion stimulus and highly sensitive to its perceptual bistability. The only region to be more active during perceived self-motion was in, or close to, the cerebellar nodulus. This activation may correspond to the gain increase of torsional optokinetic nystagmus during vection and/or to changes in sensory processing related to the rotational percept. In conclusion, we identified neural correlates of perceiving self-motion from vision alone, i.e., in the absence of confirmatory vestibular or proprioceptive input. These functional properties preserve the organism's ability to move accurately in its environment by relying on visual cues under conditions when the other spatial senses fail to provide such information.
Mots-clé
Adult, Brain/physiology, Brain Mapping, Female, Humans, Magnetic Resonance Imaging, Male, Middle Aged, Motion Perception/physiology, Photic Stimulation, Self Concept, Vestibular Nuclei/physiology, Visual Pathways/physiology
Pubmed
Web of science
Création de la notice
12/09/2011 18:28
Dernière modification de la notice
20/08/2019 15:07
Données d'usage