Unmasking the contribution of low-level features to the guidance of attention.
Neuropsychologia
; 50(14): 3478-87, 2012 Dec.
Article
em En
| MEDLINE
| ID: mdl-23044277
ABSTRACT
The role of low-level stimulus-driven control in the guidance of overt visual attention has been difficult to establish because low- and high-level visual content are spatially correlated within natural visual stimuli. Here we show that impairment of parietal cortical areas, either permanently by a lesion or reversibly by repetitive transcranial magnetic stimulation (rTMS), leads to fixation of locations with higher values of low-level features as compared to control subjects or in a no-rTMS condition. Moreover, this unmasking of stimulus-driven control crucially depends on the intrahemispheric balance between top-down and bottom-up cortical areas. This result suggests that although in normal behavior high-level features might exert a strong influence, low-level features do contribute to guide visual selection during the exploration of complex natural stimuli.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Reconhecimento Visual de Modelos
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Transtornos da Percepção
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Mascaramento Perceptivo
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Atenção
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Percepção Espacial
Tipo de estudo:
Guideline
Limite:
Adult
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Aged
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Female
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Humans
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Male
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Middle aged
Idioma:
En
Ano de publicação:
2012
Tipo de documento:
Article