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Titolo:
Differential activation in somatosensory cortex for different discrimination tasks
Autore:
Braun, C; Schweizer, R; Elbert, T; Birbaumer, N; Taub, E;
Indirizzi:
Univ Tubingen, Inst Med Psychol & Behav Neurobiol, D-72074 Tubingen, Germany Univ Tubingen Tubingen Germany D-72074 robiol, D-72074 Tubingen, Germany Univ Konstanz, Dept Psychol, D-78457 Constance, Germany Univ Konstanz Constance Germany D-78457 chol, D-78457 Constance, Germany Univ Alabama, Dept Psychol, Birmingham, AL 35294 USA Univ Alabama Birmingham AL USA 35294 pt Psychol, Birmingham, AL 35294 USA Birmingham Vet Affairs Med Ctr, Birmingham, AL 35233 USA Birmingham Vet Affairs Med Ctr Birmingham AL USA 35233 gham, AL 35233 USA
Titolo Testata:
JOURNAL OF NEUROSCIENCE
fascicolo: 1, volume: 20, anno: 2000,
pagine: 446 - 450
SICI:
0270-6474(20000101)20:1<446:DAISCF>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
ADULT OWL MONKEYS; CORTICAL REPRESENTATION; BRAILLE READERS; AREA 3B; REORGANIZATION; PLASTICITY; AMPUTATION; HUMANS; HAND; EEG;
Keywords:
cortical reorganization; plasticity; learning; somatosensory evoked potentials; dipole source analysis; tactile sensation threshold; human;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
23
Recensione:
Indirizzi per estratti:
Indirizzo: Braun, C MEG Ctr, Otfried Muller Str 7, D-72076 Tubingen, Germany MEG Ctr Otfried Muller Str 7 Tubingen Germany D-72076 n, Germany
Citazione:
C. Braun et al., "Differential activation in somatosensory cortex for different discrimination tasks", J NEUROSC, 20(1), 2000, pp. 446-450

Abstract

Maps of the body surface in somatosensory cortex have been shown to be highly plastic, altering their configuration in response to changes in use of body parts. The current study investigated alterations in the functional organization of the human somatosensory cortex resulting from massed practice. Over a period of 4 weeks, subjects were given synchronous tactile stimulation of thumb (D1) and little finger (D5) for 1 hr/d. They had to identify the orientation of the stimuli. Neuroelectric source localization based on high-resolution EEG revealed that, when subjects received passive tactile stimulation of D1 or D5, the representations of the fingers in primary somatosensory cortex were closer together after training than before. There was also an apparently correlative tendency to anomalously mislocalize near-threshold tactile stimuli equally to the distant finger costimulated during training rather than preferentially to the finger nearest to the finger stimulated in a post-training test. However, when the stimulus discrimination had to be made, neuroelectric source imaging revealed that the digital representations of D1 and D5 were further apart after training than before. Thus,the same series of prolonged repetitive stimulations produced two different opposite effects on the spatial relationship of the cortical representations of the digits, suggesting that differential activation in the same region of somatosensory cortex is specific to different tasks.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/03/20 alle ore 10:08:52