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Titolo:
ELECTROPHYSIOLOGICAL CORRELATES OF HIERARCHICAL STIMULUS-PROCESSING -DISSOCIATION BETWEEN ONSET AND LATER STAGES OF GLOBAL AND LOCAL TARGET PROCESSING
Autore:
HEINZE HJ; MUNTE TF;
Indirizzi:
MED SCH HANNOVER,DEPT NEUROL,KONSTANTY GUTSCHOW STR 8 W-3000 HANNOVER61 GERMANY
Titolo Testata:
Neuropsychologia
fascicolo: 8, volume: 31, anno: 1993,
pagine: 841 - 852
SICI:
0028-3932(1993)31:8<841:ECOHS->2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
EVENT-RELATED POTENTIALS; TEMPORAL-PARIETAL JUNCTION; INDEX FOCUSED ATTENTION; HEMISPHERIC-SPECIALIZATION; SELECTIVE ATTENTION; BRAIN POTENTIALS; INFORMATION; PRECEDENCE; PERCEPTION; INTERFERENCE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Social Sciences Citation Index
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
36
Recensione:
Indirizzi per estratti:
Citazione:
H.J. Heinze e T.F. Munte, "ELECTROPHYSIOLOGICAL CORRELATES OF HIERARCHICAL STIMULUS-PROCESSING -DISSOCIATION BETWEEN ONSET AND LATER STAGES OF GLOBAL AND LOCAL TARGET PROCESSING", Neuropsychologia, 31(8), 1993, pp. 841-852

Abstract

In the discussion of whether the processing of hierarchically structured stimuli proceeds from the more global to the more local level or vice versa, it is frequently assumed that the relative speed of global/local target identification (response time (RT) advantage) and the direction of interference from local/global distractors reflect the orderof processing. Studies both in brain-injured patients and in normals,however, have demonstrated that RT advantage and interference are dissociable, leading to the conclusion that they do not provide a valid index of the order of global/local processing. The aim of the present event-related brain potential (ERP) study was to assess electrophysiological correlates of global/local processing and to determine how the relative speed of responding to global and local targets is related to these ERP measurements. In a divided-attention paradigm, subjects wereasked to respond to hierarchically structured letter stimuli that contained a target letter either at the global or at the local level. Thebehavioral results confirmed a dissociation between RT advantage and interference. ERP analysis revealed an early posterior negative component (denoted as N250) as a sign of early global/local target perception. It was found that RT advantage is not a valid measure of the onset nor of the time course of this component. Furthermore, the N250 components to global and local targets exhibited a different time course anda different topographical distribution, suggesting that they are determined by separate processing structures. Together, the behavioral andelectrophysiological results support the view that global and local target perception may be mediated by separate brain systems acting, at least initially, in parallel.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 20/09/20 alle ore 19:28:10