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Titolo:
The attentional effects of peripheral cueing as revealed by two event-related potential studies
Autore:
Fu, SM; Fan, SL; Chen, L; Zhuo, Y;
Indirizzi:
Univ Sci & Technol China, Beijing Lab Cognit Sci, Beijing 100039, Peoples R China Univ Sci & Technol China Beijing Peoples R China 100039 Peoples R China
Titolo Testata:
CLINICAL NEUROPHYSIOLOGY
fascicolo: 1, volume: 112, anno: 2001,
pagine: 172 - 185
SICI:
1388-2457(200101)112:1<172:TAEOPC>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
PRIMARY VISUAL-CORTEX; SPATIAL SELECTIVE ATTENTION; BILATERAL STIMULUS ARRAYS; INDEX FOCUSED ATTENTION; BRAIN POTENTIALS; ELECTROPHYSIOLOGICAL EVIDENCE; VISUOSPATIAL ATTENTION; EVOKED-POTENTIALS; NEURAL MECHANISMS; FUNCTIONAL MRI;
Keywords:
visual spatial attention; event-related potentials; peripheral cue; central cue; sustained attention; striate cortex;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
69
Recensione:
Indirizzi per estratti:
Indirizzo: Fu, SM Univ Oxford, Dept Expt Psychol, S Parks Rd, Oxford OX1 3UD, EnglandUniv Oxford S Parks Rd Oxford England OX1 3UD ord OX1 3UD, England
Citazione:
S.M. Fu et al., "The attentional effects of peripheral cueing as revealed by two event-related potential studies", CLIN NEU, 112(1), 2001, pp. 172-185

Abstract

Objective: The mechanism of visual spatial attention elicited by peripheral cueing was investigated in two studies. Method: Event-related potentials (ERPs) were recorded when the subjects were performing a spatial frequency discrimination task and a location discrimination task. Stimuli were randomly hashed in the left or right visual field. Prior to each stimulus a peripheral cue was presented with a validity of 75%. Results: The subjects responded faster to valid trials than to invalid trials. The earliest visual ERP component, C1, was not modulated by the cue validity, suggesting that visual spatial attention elicited by peripheral cueing does not involve striate cortex. Valid trials elicited larger contralateral P1 but a smaller contralateral N1 than invalid trials. The early onsets of these attentional effects show that spatial attention affects stimulusprocessing at early sensory/perceptual stages. The latencies of contralateral pi and contralateral N1 were shorter for invalid trials, however. The ipsilateral N1 was enhanced by valid trials in the spatial frequency discrimination task but was not in the location discrimination task, whereas the contralateral N1 was larger for invalid trials than for valid trials in bothtasks. Conclusion: The results indicate that involuntary allocation of attention involves different mechanisms from voluntary allocation of attention. (C) 2001 Elsevier Science Ireland Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 20/01/20 alle ore 16:10:09