Two modulatory effects of attention that mediate object categorization in human cortex.

Détails

ID Serval
serval:BIB_CE72D5C8870A
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Two modulatory effects of attention that mediate object categorization in human cortex.
Périodique
Science
Auteur(s)
Rees G., Frackowiak R., Frith C.
ISSN
0036-8075 (Print)
ISSN-L
0036-8075
Statut éditorial
Publié
Date de publication
1997
Volume
275
Numéro
5301
Pages
835-838
Langue
anglais
Notes
Publication types: Journal Article ; Research Support, Non-U.S. Gov'tPublication Status: ppublish
Résumé
Attentional modulation of cortical activity was examined by varying the rate of visual stimuli in object categorization tasks according to single and conjoined features. Activation of dorsolateral frontal cortex was independent of the stimulus presentation rate and elicited by the participant's attention to conjoined compared with single features. Several cortical regions showed attentionally modulated activity. In inferior temporal cortex, modulation was due to an additional bias signal underlying normal rate-correlated activity. In two other regions (premotor cortex and cerebellum), attention modified the correlation of activity and the stimulus presentation rate. Attentional effects in the human cortex are expressed by at least two physiologically distinct mechanisms acting on spatially distributed areas.
Mots-clé
Adult, Aged, Attention, Brain Mapping, Cerebellum/blood supply, Cerebellum/physiology, Cerebral Cortex/blood supply, Cerebral Cortex/physiology, Frontal Lobe/blood supply, Frontal Lobe/physiology, Humans, Male, Middle Aged, Motor Cortex/blood supply, Motor Cortex/physiology, Neurons/physiology, Regional Blood Flow, Temporal Lobe/blood supply, Temporal Lobe/physiology, Tomography, Emission-Computed, Visual Perception/physiology
Pubmed
Web of science
Création de la notice
16/09/2011 17:53
Dernière modification de la notice
20/08/2019 16:49
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