The neural structures expressing perceptual hysteresis in visual letter recognition.

Détails

ID Serval
serval:BIB_7E6CC979C776
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
The neural structures expressing perceptual hysteresis in visual letter recognition.
Périodique
Neuron
Auteur(s)
Kleinschmidt A., Büchel C., Hutton C., Friston K.J., Frackowiak R.S.
ISSN
0896-6273 (Print)
ISSN-L
0896-6273
Statut éditorial
Publié
Date de publication
2002
Volume
34
Numéro
4
Pages
659-666
Langue
anglais
Notes
Publication types: Journal Article ; Research Support, Non-U.S. Gov'tPublication Status: ppublish
Résumé
Perception can change nonlinearly with stimulus contrast, and perceptual threshold may depend on the direction of contrast change. Such hysteresis effects in neurometric functions provide a signature of perceptual awareness. We recorded brain activity with functional neuroimaging in observers exposed to gradual contrast changes of initially hidden visual stimuli. Lateral occipital, frontal, and parietal regions all displayed both transient activations and hysteresis that correlated with change and maintenance of a percept, respectively. Medial temporal activity did not follow perception but increased during hysteresis and showed transient deactivations during perceptual transitions. These findings identify a set of brain regions sensitive to visual awareness and suggest that medial temporal structures may provide backward signals that account for neural and, thereby, perceptual hysteresis.
Mots-clé
Adult, Attention/physiology, Brain Mapping, Cerebral Cortex/anatomy & histology, Cerebral Cortex/physiology, Cognition/physiology, Contrast Sensitivity/physiology, Female, Functional Laterality/physiology, Humans, Illusions/physiology, Magnetic Resonance Imaging, Male, Neural Pathways/anatomy & histology, Neural Pathways/physiology, Pattern Recognition, Visual/physiology, Photic Stimulation, Psychomotor Performance/physiology, Reading, Sensory Deprivation/physiology, Verbal Behavior/physiology
Pubmed
Web of science
Open Access
Oui
Création de la notice
12/09/2011 17:30
Dernière modification de la notice
20/08/2019 14:39
Données d'usage