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Titolo:
THE EMERGENCE OF THE CAPACITY TO NAME LEFT VISUAL-FIELD STIMULI IN A CALLOSOTOMY PATIENT - IMPLICATIONS FOR FUNCTIONAL PLASTICITY
Autore:
BAYNES K; WESSINGER CM; FENDRICH R; GAZZANIGA MS;
Indirizzi:
UNIV CALIF DAVIS,CTR NEUROSCI DAVIS CA 95616
Titolo Testata:
Neuropsychologia
fascicolo: 10, volume: 33, anno: 1995,
pagine: 1225 - 1242
SICI:
0028-3932(1995)33:10<1225:TEOTCT>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
RIGHT-HEMISPHERE LANGUAGE; SPLIT-BRAIN; FOREBRAIN COMMISSUROTOMY; CALLOSAL SECTION; CORPUS-CALLOSUM; SPEECH; ORGANIZATION; MECHANISMS; BISECTION; PRAXIS;
Keywords:
RIGHT HEMISPHERE LANGUAGE; HEMISPHERIC DIFFERENCES; LATERALITY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
42
Recensione:
Indirizzi per estratti:
Citazione:
K. Baynes et al., "THE EMERGENCE OF THE CAPACITY TO NAME LEFT VISUAL-FIELD STIMULI IN A CALLOSOTOMY PATIENT - IMPLICATIONS FOR FUNCTIONAL PLASTICITY", Neuropsychologia, 33(10), 1995, pp. 1225-1242

Abstract

Callosotomized patient J.W. has a well-documented history of right hemisphere language abilities, including an auditory and visual lexical-semantic system with limited phonology and syntax. However, J.W. has not previously exhibited the ability to name stimuli presented to the left visual field (LVF). We report the emergence of this ability. Experiments were conducted in which pictures and text were presented to thesubject's LVF using retinal stabilization techniques to ensure lateralization. J.W. was able to correctly name approximately one-quarter ofthese stimuli under a variety of presentation conditions. The newly developed ability to respond verbally to complex LVF stimuli can be theresult of (1) enhanced inter-hemispheric transfer of information via sub-cortical pathways, (2) sophisticated cross cueing strategies, or (3) control of motor speech in the right hemisphere. Although it appears that the first two mechanisms make a contribution to J.W.'s LVF naming performance, accuracy for unpredictable stimulus sets and the errorpatterns require acknowledgement that control of motor speech is now available to the right hemisphere.

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Documento generato il 07/04/20 alle ore 23:18:53