Gamma flicker triggers attentional selection without awareness.
Proc Natl Acad Sci U S A
; 106(5): 1666-71, 2009 Feb 03.
Article
em En
| MEDLINE
| ID: mdl-19124766
ABSTRACT
Gamma band modulations in neural activity have been proposed to mediate attentional processes. To support a causal link between gamma activity and attentional selection, we attempt to evoke gamma oscillations by a 50-Hz subliminal flicker. We find that a subliminal 50-Hz flicker at a target location, before target presentation, speeds up and enhances target detection and discrimination. This effect is specific to the middle of the gamma range because it is not evident at <35-Hz flicker. It requires 300 ms to build up, dissipates within 250 ms of flicker offset, and shows a tendency to invert after 500 ms. The results are discussed in relation to a role for gamma band neural synchrony in the allocation of visual attention.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Conscientização
/
Fusão Flicker
Limite:
Humans
Idioma:
En
Ano de publicação:
2009
Tipo de documento:
Article