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Titolo:
SENSORY MAPPING IN A CONGENITALLY DEAF SUBJECT - MEG AND FMRI STUDIESOF CROSS-MODAL NON-PLASTICITY
Autore:
HICKOK G; POEPPEL D; CLARK K; BUXTON RB; ROWLEY HA; ROBERTS TPL;
Indirizzi:
UNIV CALIF SAN FRANCISCO,BIOMAGNET IMAGING LAB,513 PARNASSUS AVE SAN FRANCISCO CA 94143 UNIV CALIF SAN FRANCISCO,BIOMAGNET IMAGING LAB SAN FRANCISCO CA 94143 UNIV CALIF IRVINE,DEPT COGNIT SCI IRVINE CA 92697 SALK INST BIOL STUDIES LA JOLLA CA 92037 UNIV CALIF SAN DIEGO,DEPT RADIOL SAN DIEGO CA 92103
Titolo Testata:
Human brain mapping
fascicolo: 6, volume: 5, anno: 1997,
pagine: 437 - 444
SICI:
1065-9471(1997)5:6<437:SMIACD>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
EVENT-RELATED POTENTIALS; HIGH METABOLIC-ACTIVITY; HUMAN AUDITORY-CORTEX; BLIND HUMAN-SUBJECTS; VISUAL-CORTEX; BRAIN POTENTIALS; OCCIPITAL CORTEX; CEREBRAL-CORTEX; EARLY-ONSET; ACTIVATION;
Keywords:
FUNCTIONAL IMAGING; REORGANIZATION; AUDITORY; DEAFNESS; COGNITIVE NEUROSCIENCE;
Tipo documento:
Letter
Natura:
Periodico
Citazioni:
31
Recensione:
Indirizzi per estratti:
Citazione:
G. Hickok et al., "SENSORY MAPPING IN A CONGENITALLY DEAF SUBJECT - MEG AND FMRI STUDIESOF CROSS-MODAL NON-PLASTICITY", Human brain mapping, 5(6), 1997, pp. 437-444

Abstract

It has been proposed that the auditory cortex of deaf subjects may provide an example of cross-modal compensatory plasticity. We investigated whether sensory stimulation could elicit responses from auditory areas of a congenitally deaf subject. Neuromagnetic fields were recordedusing a 37-channel biomagnetometer under conditions of: 1) visual stimulation; 2) somatosensory stimulation; and 3) a simple motor task. Visual items were reversing checkerboards and single light spots, presented in various portions of the visual field; somatosensory stimuli were pneumatic taps delivered to individual digit-segments and the lip; the motor task was self-paced finger tapping. In addition, functional magnetic resonance imaging was used to observe the activation elicited by full-field checkerboard and sign language stimuli. No responses to passively presented visual or somatosensory stimuli were observed in the auditory cortex. In contrast, somatosensory, motor, and visual cortices revealed evoked magnetic responses comparable to those from control subjects, indicating canonical anatomic and physiological organization in these areas. These data suggest that primary projection areas do not reveal obvious plastic effects. We suggest that in the human auditory cortex compensatory plasticity emerges primarily as a property of non-primary areas and is best observed under attentionally demandingconditions. (C) 1997 Wiley-Liss, Inc.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/04/20 alle ore 02:43:17