The speed of visual cognition

Détails

ID Serval
serval:BIB_7778805E6BDD
Type
Article: article d'un périodique ou d'un magazine.
Sous-type
Synthèse (review): revue aussi complète que possible des connaissances sur un sujet, rédigée à partir de l'analyse exhaustive des travaux publiés.
Collection
Publications
Titre
The speed of visual cognition
Périodique
Supplements to Clinical Neurophysiology
Auteur(s)
Michel  C. M., Seeck  M., Murray  M. M.
ISSN
1567-424X
Statut éditorial
Publié
Date de publication
2004
Volume
57
Pages
617-27
Notes
Journal Article
Research Support, Non-U.S. Gov't
Review
Résumé
Intracranial electrophysiological recordings in primates showed repeatedly that neurons in several cortical areas are activated very early after visual stimulus presentation, practically at the same time (or even before) the activation of primary sensory neurons. Even neurons at the highest hierarchical levels of the visual system are activated in less than 100 ms. These findings challenge the classical interpretation of human evoked potential (EP) data that assume that the first, "exogenous", EP components from 50 to 150 ms reflect the initial volley of sensory activation in the striate and extrastriate visual cortex and are not yet influenced by cognitive task demands. Indeed, several recent EP studies using analysis methods that go beyond the classical approach of defining "components" at certain scalp positions indicate that highly complex stimulus features can influence EP responses within the first 100 ms. This indicates that sophisticated cognitive processing is much faster than previously thought and opens new perspectives with respect to the role of both, bottom-up as well as top-down mechanisms in visual processing.
Mots-clé
Acoustic Stimulation/methods Animals Brain Mapping Cognition/*physiology Electroencephalography/methods Evoked Potentials, Auditory/physiology Evoked Potentials, Visual/physiology Humans Linguistics Photic Stimulation/methods Reaction Time/*physiology Time Factors Visual Pathways/*physiology Visual Perception/*physiology
Pubmed
Création de la notice
21/01/2008 11:23
Dernière modification de la notice
03/03/2018 18:27
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