title: Processing of complex sounds in the human auditory cortex as revealed by magnetic brain responses.
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.
authors: Department of Psychology, University of Helsinki, Finland.
authors: K
authors: K
authors: Alho
authors: M
authors: M
authors: Tervaniemi
authors: M
authors: M
authors: Huotilainen
authors: J
authors: J
authors: Lavikainen
authors: H
authors: H
authors: Tiitinen
authors: R J
authors: RJ
authors: Ilmoniemi
authors: J
authors: J
authors: Knuutila
authors: R
authors: R
authors: Näätänen
mesh_terms: D000328:Adult; D001303:Auditory Cortex / Q000502:physiology*; D001307:Auditory Perception / Q000502:physiology*; D005260:Female; D007839:Functional Laterality; D006801:Humans; D015225:Magnetoencephalography; D008297:Male