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Titolo:
Divided visuo-spatial attention systems with total and anterior callosotomy
Autore:
Arguin, M; Lassonde, M; Quattrini, A; Del Pesce, M; Foschi, N; Papo, I;
Indirizzi:
Univ Montreal, Dept Psychol, Grp Rech Neuropsychol Expt, Montreal, PQ H3C 3J7, Canada Univ Montreal Montreal PQ Canada H3C 3J7 pt, Montreal, PQ H3C 3J7, Canada Univ Montreal, Inst Geriatrie, Ctr Rech, Montreal, PQ H3C 3J7, Canada UnivMontreal Montreal PQ Canada H3C 3J7 ch, Montreal, PQ H3C 3J7, Canada Osped Reg Torrette, Ctr Epilessia, Ancona, Italy Osped Reg Torrette Ancona Italy Torrette, Ctr Epilessia, Ancona, Italy
Titolo Testata:
NEUROPSYCHOLOGIA
fascicolo: 3, volume: 38, anno: 2000,
pagine: 283 - 291
SICI:
0028-3932(2000)38:3<283:DVASWT>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
SPLIT-BRAIN PATIENTS; DISCONNECTED CEREBRAL HEMISPHERES; SELECTIVE ATTENTION; CORPUS-CALLOSUM; SEARCH; ORGANIZATION; ALLOCATION; NETWORKS; ONSETS; PET;
Keywords:
split-brains; vision; reaction time;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Social & Behavioral Sciences
Life Sciences
Citazioni:
34
Recensione:
Indirizzi per estratti:
Indirizzo: Arguin, M Univ Montreal, Dept Psychol, Grp Rech Neuropsychol Expt, CP 6128,Succ Ctr Ville, Montreal, PQ H3C 3J7, Canada Univ Montreal CP 6128,Succ Ctr Ville Montreal PQ Canada H3C 3J7
Citazione:
M. Arguin et al., "Divided visuo-spatial attention systems with total and anterior callosotomy", NEUROPSYCHO, 38(3), 2000, pp. 283-291

Abstract

The role of the corpus callosum in the inter-hemispheric integration of the visuo-spatial attention system, was investigated in patients with a totalcallosotomy or with an anterior callosal section. Subjects produced simplereaction times (RTs) to visual targets shown to the left or right visual hemifield. Preceding the target by an interval of 500 ms, arrow cues predicting the target location were shown left and right of the point of ocular fixation. For a majority of total and anterior callosotomy patients, results with valid focused cues (both arrows pointing to the target location) and with divided-attention cues (arrows pointing away from fixation) did not differ and both conditions produced shorter RTs than with neutral cues (equal signs). In contrast, neurologically intact subjects showed equal RTs with divided-attention and neutral cues, whereas valid focused cues produced reduced RTs relative to neutral cues. These results indicate that most split-brains, in contrast to normal observers, are capable of directing their attention to left and right visual field locations simultaneously, and thereforethat each cerebral hemisphere controls its own visuo-spatial attention mechanism. (C) 1999 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 19/01/20 alle ore 00:48:33