Lateralization of speech processing in the brain as indicated by mismatch negativity and dichotic listening

Author(s): Kujala, T., Lyytinen, H., Kujala, J., Ilmoniemi, R. J., Naatanen, R.

Journal/Book: Brain Cognition. 2000; 43: 525 B St, Ste 1900, San Diego, CA 92101-4495, USA. Academic Press Inc. 392-398.

Abstract: The goal of the present study was to evaluate the differences between dichotic listening and mismatch negativity as measures of speech lateralization in the human brain. For this purpose, we recorded the magnetic equivalent of the mismatch negativity, elicited by consonant-vowel syllable change, and tested the same subjects in the dichotic listening procedure. The results showed th:lt both methods indicated left-hemisphere dominance in speech processing. However, the mismatch negativity, as compared to the right-ear advantage, suggested slightly stronger left-hemisphere dominance in speech processing. No clear correlation was found between the laterality indexes of mismatch negativity and right-car advantage calculated from dichotic listening results. The possible explanation for this finding would be that these two measures reflect different stares of speech processing in the human brain.

Note: Article Shtyrov Y, Univ Helsinki, Dept Psychol, Cognit Brain Res Unit, Fabianinkatu 28, SF-00100 Helsinki, FINLAND

Keyword(s): HEMISPHERIC LATERALIZATION; ASYMMETRIES; PERCEPTION; SPECIALIZATION; ATTENTION

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