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Titolo:
SPATIAL CUEING, SENSORY GATING AND SELECTIVE RESPONSE PREPARATION - AN ERP STUDY ON VISUOSPATIAL ORIENTING
Autore:
EIMER M;
Indirizzi:
UNIV MUNICH,INST PSYCHOL,LEOPOLDSTR 13 W-8000 MUNICH 40 GERMANY
Titolo Testata:
Electroencephalography and clinical neurophysiology
fascicolo: 5, volume: 88, anno: 1993,
pagine: 408 - 420
SICI:
0013-4694(1993)88:5<408:SCSGAS>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
EVENT-RELATED POTENTIALS; BILATERAL STIMULUS ARRAYS; INDEX FOCUSED ATTENTION; BRAIN POTENTIALS; SENSITIVITY; LOCATION;
Keywords:
EVENT-RELATED POTENTIALS; VISUOSPATIAL ATTENTION; CONTINGENT NEGATIVE VARIATION (CNV); LATERALIZED READINESS POTENTIAL (LRP);
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
30
Recensione:
Indirizzi per estratti:
Citazione:
M. Eimer, "SPATIAL CUEING, SENSORY GATING AND SELECTIVE RESPONSE PREPARATION - AN ERP STUDY ON VISUOSPATIAL ORIENTING", Electroencephalography and clinical neurophysiology, 88(5), 1993, pp. 408-420

Abstract

Event-related brain potentials (ERPs) were recorded in a visuo-spatial attention task where the position of an imperative stimulus was indicated either validly or invalidly by a central arrow (trial-by-trial cueing). Subjects had to perform choice RT tasks with the response being dependent either on the identity of the target stimulus or on its position. When target identity was relevant for response selection, validly cued stimuli elicited amplitude enhancements of the early, sensory-evoked P1 and N1 components at lateral posterior sites. The N1 validity effect was limited to scalp sites ipsilateral to the visual field of stimulus presentation. Although these effects were found only when the sensory discrimination task was considerably difficult, they are inline with models assuming that modulations of sensory-perceptual processing (''sensory gating'') are induced by spatial cueing. However, when target location was response-relevant, N1 amplitude enhancements were consistently elicited by invalidly cued letters. CNV and LRP measures indicated that the arrow elicited response-related processing in the cue-target interval. Such processes occurred even when the cue contained no information about an upcoming response. Two consecutive lateralization phases were distinguishable in the LRP, with experimentally induced response assignments becoming effective only during the second phase.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 22/09/20 alle ore 14:09:16