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Hemispheric lateralization in preattentive processing of speech sounds
K Alho1, J F Connolly, M Cheour
1Department of Psychology, University of Helsinki, Finland. kalho@helsinki.fi
Neuroscience Letters
|January 6, 1999
Abstract:
Event-related magnetoencephalographic (MEG) responses to infrequently presented spoken deviant syllables [di] and [ba] among repetitive standard [da)]syllables were recorded in subjects who either attended to these stimuli in order to discriminate the [ba] syllables or ignored them while attending a silent movie. In both conditions, the deviant syllables elicited a mismatch response (MMNm, the magnetic counterpart of mismatch negativity), which was stronger in the left than in the right auditory cortex, indicating left-hemispheric dominance in speech processing already at a preattentive processing level.