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Titolo:
ATTENTION AND OCULOMOTOR CONTROL - A HIGH-DENSITY ERP STUDY OF THE GAP EFFECT
Autore:
CSIBRA G; JOHNSON MH; TUCKER LA;
Indirizzi:
MRC,COGNIT DEV UNIT,4 TAVITON ST LONDON WC1H 0BT ENGLAND
Titolo Testata:
Neuropsychologia
fascicolo: 6, volume: 35, anno: 1997,
pagine: 855 - 865
SICI:
0028-3932(1997)35:6<855:AAOC-A>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
SUPERIOR COLLICULUS; ELECTRODE LATERALITY; CORTICAL POTENTIALS; SACCADIC LATENCY; WARNING SIGNALS; EARLY SELECTION; FIXATION POINT; OFFSET; INSTRUCTIONS; DIRECTION;
Keywords:
ERP; GAP EFFECT; SACCADE PLANNING; COVERT ATTENTION; PRE-SACCADIC POTENTIALS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
39
Recensione:
Indirizzi per estratti:
Citazione:
G. Csibra et al., "ATTENTION AND OCULOMOTOR CONTROL - A HIGH-DENSITY ERP STUDY OF THE GAP EFFECT", Neuropsychologia, 35(6), 1997, pp. 855-865

Abstract

In a gap paradigm, healthy adult subjects performed visually triggered saccades to peripheral targets either with the fixation stimulus remaining on (overlap trials) or going off before target onset (gap trials). All subjects showed faster reaction times in the gap trials (the gap effect). High density scalp event-related potentials were recorded time-locked to both the target stimuli and the eve movement onset. We observed three neural correlates of the gap effect: (i) a prefrontal positivity that precedes the target presentation which may reflect specific preparatory processes, (ii) an enhancement of the early cortical visual responses (P1) to the peripheral target in the gap trials, and (iii) a prolongation of parietal activity in the overlap trials relative to the gap trials prior to the saccade execution. These results suggest that several factors contribute to the gap effect, each having its own neural basis. (C) 1997 Elsevier Science Ltd.

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Documento generato il 02/07/20 alle ore 19:06:48