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Titolo:
Preserved adjustment but impaired awareness in a sensory-motor conflict following prefrontal lesions
Autore:
Slachevsky, A; Pillon, B; Fourneret, P; Pradat-Diehl, P; Jeannerod, M; Dubois, B;
Indirizzi:
Hop La Salpetriere, Fererat Neurol, F-75651 Paris 13, France Hop La Salpetriere Paris France 13 erat Neurol, F-75651 Paris 13, France INSERM, EPI 0007, Paris, France INSERM Paris FranceINSERM, EPI 0007, Paris, France Inst Cognit Sci, Lyon, France Inst Cognit Sci Lyon FranceInst Cognit Sci, Lyon, France
Titolo Testata:
JOURNAL OF COGNITIVE NEUROSCIENCE
fascicolo: 3, volume: 13, anno: 2001,
pagine: 332 - 340
SICI:
0898-929X(20010401)13:3<332:PABIAI>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
SELF-CONSCIOUSNESS; FRONTAL LOBES; CORTEX DAMAGE; BEHAVIOR; HUMANS; MEMORY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
31
Recensione:
Indirizzi per estratti:
Indirizzo: Slachevsky, A Hop La Salpetriere, Fererat Neurol, 4 Blvd Hop, F-75651 Paris 13, France Hop La Salpetriere 4 Blvd Hop Paris France 13 is 13, France
Citazione:
A. Slachevsky et al., "Preserved adjustment but impaired awareness in a sensory-motor conflict following prefrontal lesions", J COGN NEUR, 13(3), 2001, pp. 332-340

Abstract

Control of action occurs at different stages of the executive process, in particular at those of sensory-motor integration and conscious monitoring. The aim of this study was to determine the implication of the prefrontal cortex in the control of action. For that purpose, we compared the performance of 15 patients with frontal lobe lesions and 15 matched controls on an experimental paradigm generating a conflict between the action planned and the sensory-motor feedback. Subjects had to trace a sagittal line with a stylus on a graphic tablet. The hand was hidden by a mirror on which the tracedline, processed by a computer, was projected. Without informing the subjects, the line traced was modified by introducing a bias to the right, which increased progressively from 2 to 42. To succeed the task, subjects had to modify their motor program and deviate their hand in the opposite direction. The sensory-motor adjustment to the bias was evaluated by the surface between the line traced and the ideal line to compensate for the deviation. The awareness of the conflict was measured by the angle of the bias at which subjects expressed the feeling that the line they traced was not the same as the line they saw. The deviation was similarly compensated for by patients and controls until 24 degrees. Then 14 controls but only 3 patients were aware of a conflict. After that, the variability of performance increased significantly for the unaware patients. These results suggest that the prefrontal cortex is required at the level of conscious monitoring of actions, but nor at the level of sensory-motor integration.

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Documento generato il 28/03/20 alle ore 13:50:33