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Combined mapping of human auditory EEG and MEG responses.

Authors
  • Huotilainen, M
  • Winkler, I
  • Alho, K
  • Escera, C
  • Virtanen, J
  • Ilmoniemi, R J
  • Jääskeläinen, I P
  • Pekkonen, E
  • Näätänen, R
Type
Published Article
Journal
Electroencephalography and Clinical Neurophysiology
Publisher
Elsevier
Publication Date
Jul 01, 1998
Volume
108
Issue
4
Pages
370–379
Identifiers
PMID: 9714379
Source
Medline
License
Unknown

Abstract

Auditory electric and magnetic P50(m), N1(m) and MMN(m) responses to standard, deviant and novel sounds were studied by recording brain electrical activity with 25 EEG electrodes simultaneously with the corresponding magnetic signals measured with 122 MEG gradiometer coils. The sources of these responses were located on the basis of the MEG responses; all were found to be in the supratemporal plane. The goal of the present paper was to investigate to what degree the source locations and orientations determined from the magnetic data account for the measured EEG signals. It was found that the electric P50, N1 and MMN responses can to a considerable degree be explained by the sources of the corresponding magnetic responses. In addition, source-current components not detectable by MEG were shown to contribute to the measured EEG signals.

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