Reversal negativity and bistable stimuli: Attention, awareness, or something else?
Brain Cogn
; 74(1): 24-34, 2010 Oct.
Article
em En
| MEDLINE
| ID: mdl-20598419
ABSTRACT
Ambiguous (or bistable) figures are visual stimuli that have two mutually exclusive perceptual interpretations that spontaneously alternate with each other. Perceptual reversals, as compared with non-reversals, typically elicit a negative difference called reversal negativity (RN), peaking around 250 ms from stimulus onset. The cognitive interpretation of RN remains unclear it may reflect either bottom-up processes, attentional processes that select between the alternative views of the stimulus, or it may reflect the change in the contents of subjective awareness. In the present study, event-related potentials in response to endogenous unilateral and bilateral reversals of two Necker lattices were compared with exogenously induced reversals of unambiguous lattices. The RN neither resembled the attention-related N2pc response, nor did it correlate with the content of subjective visual awareness. Thus, we conclude that RN is a non-attentional ERP correlate of the changes in the perceptual configuration of the presented object.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Ilusões Ópticas
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Atenção
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Conscientização
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Percepção Visual
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Córtex Cerebral
Limite:
Adult
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Female
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Humans
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Male
Idioma:
En
Ano de publicação:
2010
Tipo de documento:
Article