Processing of complex sounds in the human auditory cortex as revealed by magnetic brain responses

Author(s): Tervaniemi, M., Huotilainen, M., Lavikainen, J., Tiitinen, H., Ilmoniemi, R. J., Knuutila, J., Naatanen, R.

Journal/Book: Psychophysiology. 1996; 33: 1010 Vermont Ave NW, Suite 1100, Washington, DC 20005. Soc Psychophysiol Res. 369-375.

Abstract: Processing of simple and complex sounds in the human brain was compared by recording extracranial magnetic mismatch responses (MMNm; the magnetic counterpart of the mismatch negativity, or MMN) to frequency changes in these sounds. Generator sources, modeled as equivalent current dipoles (ECDs), of MMNm responses to a change in one frequency element of complex sounds (a chord and a serial tone pattern) were located in supratemporal auditory cortex, on average, 10 mm medially to the source of an MMNm elicited by an identical frequency change in a simple tone. These results suggest that at least partially different supratemporal neuron populations are involved in processing changes in simple and complex sounds and that sensory-memory representations for these sounds may be located in different fields of the auditory cortex.

Note: Article K Alho, Helsinki Univ, Dept Psychol, Cognit Psychophysiol Res Unit, POB 11, FIN-00014 Helsinki, Finland

Keyword(s): complex sounds; magnetoencephalography; mismatch negativity; auditory cortex; EVENT-RELATED POTENTIALS; MISMATCH NEGATIVITY; SENSORY MEMORY; TONOTOPIC ORGANIZATION; SELECTIVE ATTENTION; STIMULI; FIELDS; LOCALIZATION; INFORMATION; PATTERNS

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