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Titolo:
Visual search and visual working memory in patients with chronic focal cortical lesions
Autore:
Greenlee, MW; Berg, H; Stuhr, V; Mergner, T;
Indirizzi:
Univ Hosp Freiburg, Dept Neurol, D-79106 Freiburg, Germany Univ Hosp Freiburg Freiburg Germany D-79106 l, D-79106 Freiburg, Germany Univ Freiburg, Dept Biophys, Brain Res Grp, D-79102 Freiburg, Germany UnivFreiburg Freiburg Germany D-79102 es Grp, D-79102 Freiburg, Germany Univ Oldenburg, Dept Psychol, D-26111 Oldenburg, Germany Univ Oldenburg Oldenburg Germany D-26111 hol, D-26111 Oldenburg, Germany
Titolo Testata:
VISION RESEARCH
fascicolo: 27, volume: 40, anno: 2000,
pagine: 3759 - 3773
SICI:
0042-6989(2000)40:27<3759:VSAVWM>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
SHORT-TERM-MEMORY; INFERIOR TEMPORAL CORTEX; PRIMATE PREFRONTAL CORTEX; INFEROTEMPORAL CORTEX; RHESUS-MONKEY; POSTERIOR PARIETAL; GUIDED SACCADES; BRAIN-DAMAGE; NEURONAL-ACTIVITY; CEREBRAL-LESIONS;
Keywords:
working memory; visual search; eye movements; brain lesions;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
66
Recensione:
Indirizzi per estratti:
Indirizzo: Greenlee, MW Univ Hosp Freiburg, Dept Neurol, Breisacherstr 64, D-79106 Freiburg, Germany Univ Hosp Freiburg Breisacherstr 64 Freiburg Germany D-79106
Citazione:
M.W. Greenlee et al., "Visual search and visual working memory in patients with chronic focal cortical lesions", VISION RES, 40(27), 2000, pp. 3759-3773

Abstract

Visually guided behavior is known to involve temporo-parietal, inferotemporal, and prefrontal cortex and each of these areas appears to contribute tovisual working memory. We explored the extent to which chronic lesions in one of these cortical areas affect visually guided oculomotor performance. We also explore whether possible impairments become more pronounced with increasing memory road. With this aim we recorded saccadic eye movements in 19 patients with a chronic focal postsurgical lesion in either temporo-parietal, inferior temporal or prefrontal cortex. Their results are compared to those of 19 age-matched volunteers. The subjects performed three different visual search tasks with increasing memory load: Instructed search, cue-guided search and memory-guided search. In addition, the latter task was performed with a short (1 s) and a long (6 s) delay. All tasks required the subjects to make a saccade to a single target presented together with one or three distracters. The results indicate that patients with inferotemporal lesions make the most task-related errors. Saccadic reaction times (SRTs) weresignificantly prolonged in patients with temporo-parietal and prefrontal lesions, but were unaffected in the patients with lesions in the inferotemporal cortex. The spatial accuracy of saccades was lowest in patients with temporo-parietal lesions. An increase in memory load led to more errors, to longer reaction times and to lower saccadic precision. However, the effect was similar across the three patient groups and the controls. An error analysis indicated that both patients and controls tended to weight global (luminance contrast and form) features higher than local features (line-segment orientation) when making difficult perceptual decisions. (C) 2000 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/09/20 alle ore 19:54:49