The speed of visual cognition
Details
Serval ID
serval:BIB_7778805E6BDD
Type
Article: article from journal or magazin.
Publication sub-type
Review (review): journal as complete as possible of one specific subject, written based on exhaustive analyses from published work.
Collection
Publications
Institution
Title
The speed of visual cognition
Journal
Supplements to Clinical Neurophysiology
ISSN
1567-424X
Publication state
Published
Issued date
2004
Volume
57
Pages
617-27
Notes
Journal Article
Research Support, Non-U.S. Gov't
Review
Research Support, Non-U.S. Gov't
Review
Abstract
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.
Keywords
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
Create date
21/01/2008 11:23
Last modification date
20/08/2019 15:34