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Memory-related processing of complex sound patterns in human auditory cortex: a MEG study
K Alho1, M Huotilainen, H Tiitinen
1Department of Psychology, University of Helsinki, Finland.
Neuroreport
|April 1, 1993
Abstract:
Responses of the human brain to a complex sound pattern were recorded with a 24 channel magnetometer. The sound pattern consisted of 9 successive 50 ms segments, each with a different frequency. An infrequent change in the frequency of one of the segments elicited a magnetic mismatch response (MMNm) which peaked at about 200 ms after the deviant segment onset and resembled the electrical mismatch negativity (MMN). The equivalent current dipole which best explained the MMNm was located in the supratemporal auditory cortex, suggesting that a memory trace for the sound pattern was stored in that region.