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Titolo:
Time-related changes in task performance after lesions restricted to the frontal cortex
Autore:
Koski, L; Petrides, M;
Indirizzi:
Univ Calif Los Angeles, Sch Med, Ahmanson Lovelace Brain Mapping Ctr, Los Angeles, CA 90095 USA Univ Calif Los Angeles Los Angeles CA USA 90095 Los Angeles, CA 90095 USA McGill Univ, Montreal Neurol Inst, Cognit Neurosci Unit, Montreal, PQ, Canada McGill Univ Montreal PQ Canada ognit Neurosci Unit, Montreal, PQ, Canada
Titolo Testata:
NEUROPSYCHOLOGIA
fascicolo: 3, volume: 39, anno: 2001,
pagine: 268 - 281
SICI:
0028-3932(2001)39:3<268:TCITPA>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
POSITRON EMISSION TOMOGRAPHY; SUSTAINED ATTENTION; DIRECTED ATTENTION; FUNCTIONAL-ANATOMY; RIGHT-HEMISPHERE; HUMAN BRAIN; VIGILANCE; NETWORK; LOCALIZATION; ACTIVATION;
Keywords:
time-related changes; task performance; lesions; frontal cortex;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Social & Behavioral Sciences
Life Sciences
Citazioni:
29
Recensione:
Indirizzi per estratti:
Indirizzo: Koski, L Univ Calif Los Angeles, Sch Med, Ahmanson Lovelace Brain Mapping Ctr, 660 Charles E Young Dr S, Los Angeles, CA 90095 USA Univ Calif Los Angeles 660 Charles E Young Dr S Los Angeles CA USA 90095
Citazione:
L. Koski e M. Petrides, "Time-related changes in task performance after lesions restricted to the frontal cortex", NEUROPSYCHO, 39(3), 2001, pp. 268-281

Abstract

Behavioural studies in patients and functional neuroimaging studies in normal subjects suggest that the right frontal cortex plays an important role in sustaining attention to a task. However, the contribution of different regions of the frontal lobe to performance changes has not been clearly established. First, the assessment of sustained attention has not been carried out in patients with lesions that are restricted to cortical regions of thefrontal lobe. Second, although sustained attention is often measured by performance on a task requiring effortful attention, it may be more meaningful to measure changes in performance as a function of time-on-task. Two studies were carried out in five groups of subjects: patients with left or right frontal cortical resections, patients with left or right anterior temporal lobe resections, and normal controls. In the first experiment, a brief (4-min) selective attention task was performed. The right frontal group, unlike the other groups, did not show improved reaction times after the first minute on the task. The second experiment involved a long (30-min) shifting attention task. Both the left and right frontal groups were slower than control groups: however, reaction times in the right frontal group increased with time spent on the task. We conclude that the: right frontal cortex plays an essential role in modulating arousal during performance of a task and may also underlie aspects of learning during the early stages of task performance. (C) 2001 Elsevier Science Ltd. All rights reserved.

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Documento generato il 19/01/20 alle ore 14:41:52