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Titolo:
SHIFTS OF VISUAL-SPATIAL ATTENTION MODULATE A STEADY-STATE VISUAL-EVOKED POTENTIAL
Autore:
BELMONTE M;
Indirizzi:
88 CRESCENT PL 2 YONKERS NY 10704
Titolo Testata:
Cognitive brain research
fascicolo: 4, volume: 6, anno: 1998,
pagine: 295 - 307
SICI:
0926-6410(1998)6:4<295:SOVAMA>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
EVENT-RELATED POTENTIALS; BILATERAL STIMULUS ARRAYS; INDEX FOCUSED ATTENTION; SELECTIVE ATTENTION; BRAIN POTENTIALS; ELECTROPHYSIOLOGICAL EVIDENCE; ERP; ALLOCATION; NEGLECT; EEG;
Keywords:
SHIFT; VISUAL SPATIAL ATTENTION; STEADY-STATE EVOKED POTENTIAL;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
48
Recensione:
Indirizzi per estratti:
Citazione:
M. Belmonte, "SHIFTS OF VISUAL-SPATIAL ATTENTION MODULATE A STEADY-STATE VISUAL-EVOKED POTENTIAL", Cognitive brain research, 6(4), 1998, pp. 295-307

Abstract

Although the effects of static allocations of visual spatial attention have been investigated using event-related potentials, most studies of shifts in visual spatial attention have been limited to behaviouralmeasures. This study applied electroencephalographic measures to shifts in visual spatial attention in an effort to elucidate the time courses of such shifts. Using a custom-developed steady-state evoked potential analysis system, we analysed amplitude changes in EEG responses to rapid, periodic visual stimulation during a behavioural task that required rapid, repetitive shifts in visual spatial attention. Both stimulus-evoked oscillations (that is, those signals whose phases matched the phase of the steady-state stimulus) and ongoing, background (non-phase-locked) oscillations were measured. This analysis revealed a transient increase in phase-locked amplitude, in the interval 0-300-ms post-stimulus, contralateral to the visual hemifield in which an attendedtarget appeared. The magnitude of this increase varied with the length of the interval since the previous shift. In addition, by about 600-ms post-stimulus, phase-locked amplitude increased in the hemisphere contralateral to the newly-attended visual hemifield and decreased in the ipsilateral hemisphere. In the case of long inter-target intervals,phase-locked amplitude increased in the right hemisphere regardless of the laterality of the target. Non-phase-locked amplitude exhibited acomplementary pattern of modulation: it decreased contralaterally to the newly-attended visual hemifield and increased ipsilaterally. Thesecomponents may be electrophysiological concomitants of both transientand long-lasting alterations in neural function that implement shiftsin visual spatial attention. In particular, we suggest that they may reflect orienting to a target stimulus, and reorienting to a cued location. (C) 1998 Elsevier Science B.V.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/10/20 alle ore 08:19:04