Repetition Learning of Vibrotactile Temporal Sequences: An fMRI Study in Blind and Sighted Individuals
Identifieur interne : 002994 ( Main/Exploration ); précédent : 002993; suivant : 002995Repetition Learning of Vibrotactile Temporal Sequences: An fMRI Study in Blind and Sighted Individuals
Auteurs : Harold Burton [États-Unis] ; Alvin Agato [États-Unis] ; Robert J. Sinclair [États-Unis]Source :
- Brain research [ 0006-8993 ] ; 2011.
Abstract
The present fMRI study examined cortical activity to repeated vibrotactile sequences in 11 early blind and 11 sighted participants. All participants performed with >90% accuracy and showed practice induced improvement with faster reaction times in identifying matched and unmatched vibrotactile sequences. In blind only, occipital/temporal and parietal/somatosensory cortices showed practice induced reductions in positive BOLD amplitudes that possibly reflected repetition induced learning effects. The significant findings in occipital cortex of blind indicated that perceptual processing of tactile inputs in visually deprived cortex is dynamic as response amplitudes changed with practice. Thus, stimulus processing became more efficient. It was hypothesized that the changes in occipital cortex of blind reflected life-long skill in processing somatosensory inputs. Both groups showed activity reductions with practice in mid/posterior ventrolateral prefrontal cortex. These activity reductions suggested common stimulus-response learning associations for vibrotactile sequences in mid/posterior ventrolateral prefrontal cortex.
Url:
DOI: 10.1016/j.brainres.2011.11.039
PubMed: 22154406
PubMed Central: 3249477
Affiliations:
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Sinclair</name><affiliation wicri:level="2"><nlm:aff id="A3">Department of Biology, Washington University, Danforth Campus, St. Louis, MO 63110</nlm:aff><country xml:lang="fr">États-Unis</country><placeName><region type="state">Missouri (État)</region></placeName><wicri:cityArea>Department of Biology, Washington University, Danforth Campus, St. Louis</wicri:cityArea></affiliation></author></analytic><series><title level="j">Brain research</title><idno type="ISSN">0006-8993</idno><idno type="eISSN">1872-6240</idno><imprint><date when="2011">2011</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><p id="P1">The present fMRI study examined cortical activity to repeated vibrotactile sequences in 11 early blind and 11 sighted participants. All participants performed with >90% accuracy and showed practice induced improvement with faster reaction times in identifying matched and unmatched vibrotactile sequences. In blind only, occipital/temporal and parietal/somatosensory cortices showed practice induced reductions in positive BOLD amplitudes that possibly reflected repetition induced learning effects. The significant findings in occipital cortex of blind indicated that perceptual processing of tactile inputs in visually deprived cortex is dynamic as response amplitudes changed with practice. Thus, stimulus processing became more efficient. It was hypothesized that the changes in occipital cortex of blind reflected life-long skill in processing somatosensory inputs. Both groups showed activity reductions with practice in mid/posterior ventrolateral prefrontal cortex. 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