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Discrimination of speech-like contrasts in the auditory thalamus and cortex

J. Acoust. Soc. Am. Volume 96, Issue 5, pp. 2758-2768 (November 1994)

Issue Date: November 1994
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Nina Kraus
Northwestern University, Department of Communication Sciences and Disorders, Department of Neurobiology and Physiology, Department of Otolaryngology, Head and Neck Surgery, Evanston, Illinois 60208

Therese McGee, Thomas Carrell, Cynthia King, Thomas Littman, and Trent Nicol
Northwestern University, Department of Communication Sciences and Disorders, Evanston, Illinois 60208
The neurophysiologic discrimination of acoustic contrasts was investigated as reflected by the mismatch negativity (MMN) response. Evoked responses were recorded from guinea pig thalamus (medial geniculate nucleus) and epidural surface in response to synthesized speech contrasts /ga/–/da/ and /ba/–/wa/. From the caudomedial portion of the medial geniculate nucleus, /ba/–/wa/ elicited a strong mismatch response, whereas /ga/–/da/ did not. Neither stimulus contrast elicited an MMN from the ventral, or primary, portion of medial geniculate. Both stimulus contrasts elicited an MMN from the midline surface. Neither contrast elicited an MMN from the surface over the temporal lobe. Results indicate a hierarchy of processing of the spectrotemporal changes which characterize formant transitions. Also, results indicate that the nonprimary portions of the auditory pathway contribute substantially to the MMN.
History: Received 14 February 1994; accepted 1 July 1994
Permalink: http://dx.doi.org/10.1121/1.411282

KEYWORDS and PACS

Keywords
PACS
  • 43.64.Sj
    Acoustics Physiological acoustics Neural responses to speech
  • YEAR: 1994

PUBLICATION DATA

ISSN:
0001-4966 (print)  
Publisher:
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