Delayed striate cortical activation during spatial attention.
Neuron
; 35(3): 575-87, 2002 Aug 01.
Article
em En
| MEDLINE
| ID: mdl-12165478
ABSTRACT
Recordings of event-related potentials (ERPs) and event-related magnetic fields (ERMFs) were combined with functional magnetic resonance imaging (fMRI) to study visual cortical activity in humans during spatial attention. While subjects attended selectively to stimulus arrays in one visual field, fMRI revealed stimulus-related activations in the contralateral primary visual cortex and in multiple extrastriate areas. ERP and ERMF recordings showed that attention did not affect the initial evoked response at 60-90 ms poststimulus that was localized to primary cortex, but a similarly localized late response at 140-250 ms was enhanced to attended stimuli. These findings provide evidence that the primary visual cortex participates in the selective processing of attended stimuli by means of delayed feedback from higher visual-cortical areas.
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Base de dados:
MEDLINE
Assunto principal:
Tempo de Reação
/
Atenção
/
Percepção Espacial
/
Córtex Visual
/
Vias Visuais
/
Campos Visuais
/
Potenciais Evocados Visuais
Limite:
Adult
/
Female
/
Humans
/
Male
Idioma:
En
Revista:
Neuron
Assunto da revista:
NEUROLOGIA
Ano de publicação:
2002
Tipo de documento:
Article
País de afiliação:
Alemanha