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Journal of Neuroscience, Vol 15, 2748-2755, Copyright © 1995 by Society for Neuroscience
Magnetic and electric brain activity evoked by the processing of tone and vowel stimuli
C Eulitz, E Diesch, C Pantev, S Hampson and T Elbert
Institute for Experimental Audiology, University of Munster, Germany.
Sustained magnetic and electric brain waves may reflect linguistic
processing when elicited by auditory speech stimuli. In the present study,
only in the latency interval subsequent to the N1m/N1 has a sensitivity of
brain responses to features of speech been demonstrated. We conclude this
from studying the auditory-evoked magnetic field (AEF) and the
corresponding evoked potential (AEP) in response to vowels and a tone.
Brain activity was recorded from the left and the right hemisphere of 11
subjects. Three aspects of transient activity were examined: (1) the
amplitudes and source characteristics of the N1m component of the AEF; (2)
the amplitudes and source characteristics of the sustained field (SF), and
(3) the corresponding amplitude characteristics of the AEP. Sustained
potential amplitudes and SF root mean square amplitudes, as well as the
dipole strength of the SF source, were found to be larger for vowel-evoked
signals than for signals elicited by the tone stimulus. The amplitude and
dipole strength effects had an interaction with hemisphere, with larger
interhemispheric differences for the vowel condition, as well as larger
tone-vowel differences of these parameters in the speech-dominant left
hemisphere. No statistically significant hemisphere-by-stimulus-type
interactions were found in N1/N1m amplitudes and N1m source parameters.
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