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| Research article summary (published 29 Jun 2003): |
Auditory-motor interaction revealed by fMRI: speech, music, and working memory in area Spt.
Full Abstract
The concept of auditory-motor interaction pervades speech science research, yet the cortical systems supporting this interface have not been elucidated. Drawing on experimental designs used in recent work in sensory-motor integration in the cortical visual system, we used fMRI in an effort to identify human auditory regions with both sensory and motor response properties, analogous to single-unit responses in known visuomotor integration areas. The sensory phase of the task involved listening to speech (nonsense sentences) or music (novel piano melodies); the "motor" phase of the task involved covert rehearsal/humming of the auditory stimuli. A small set of areas in the superior temporal and temporal-parietal cortex responded both during the listening phase and the rehearsal/humming phase. A left lateralized region in the posterior Sylvian fissure at the parietal-temporal boundary, area Spt, showed particularly robust responses to both phases of the task. Frontal areas also showed combined auditory + rehearsal responsivity consistent with the claim that the posterior activations are part of a larger auditory-motor integration circuit. We hypothesize that this circuit plays an important role in speech development as part of the network that enables acoustic-phonetic input to guide the acquisition of language-specific articulatory-phonetic gestures; this circuit may play a role in analogous musical abilities. In the adult, this system continues to support aspects of speech production, and, we suggest, supports verbal working memory.
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Author information
Author/s: Hickok, Gregory (G); Buchsbaum, Bradley (B); Humphries, Colin (C); Muftuler, Tugan (T);
Affiliation: University of California, Irvine, CA 92697, USA. gshickok@uci.edu
Grants: R01 DC03681 (Agency:United States NIDCD)
Journal and publication information
Publication Type: Comparative Study; Journal Article; Research Support, U.S. Gov't, P.H.S.
Journal: Journal of cognitive neuroscience (J Cogn Neurosci), published in United States. (Language: eng)
Reference: 2003-Jul; vol 15 (issue 5) : pp 673-82
Dates: Created 2003/09/10; Completed 2003/10/14; Revised 2007/11/14;
PMID: 12965041, status: MEDLINE (last retrieval date: 11/6/2008)
Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.
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