Domain specificity of speech processing: a combined MEG-EEG study
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1
Cognitive Brain Research Unit, Institute of Behavioral Sciences, University of Helsinki, Finland
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2
BioMag Laboratory, Hospital District of Helsinki and Uusimaa, HUSLAB, Helsinki University Central Hospital, Finland
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3
Laboratory of Neurophysiology, Mental Health Research Centre, Russian Academy of Medical Sciences, Russia
We investigated speech-sound domain specificity and lateralization of sound processing by examining the cortical discrimination profile for speech features and their no speech counterparts in healthy adults. MMNs were recorded to five syllable deviants (vowel, consonant, frequency, duration, and intensity) and their acoustically matching no speech counterparts with a combined MEG-EEG device, using a multi-feature MMN paradigm. The dipole moments of the MMNm for speech sound changes were larger than for no speech counterparts. This was mostly due to vowel changes eliciting larger dipoles than their counterparts. Enhancement was also found for duration and frequency MMNms in the speech condition when compared to the no speech condition. Further, the intensity MMNm was larger in the right than left hemisphere. A separate analysis for each hemisphere, however, suggested hemispheric differences in processing speech vs. no speech sounds. Speech sounds elicited larger MMNm dipoles for vowel, consonant and duration changes than no speech sounds in the left hemisphere, whereas no feature-specific effects were found in the right hemisphere. The EEG results were mainly consistent with the MEG results, with larger MMN amplitudes for vowel and frequency changes in the speech than no speech condition but larger duration MMN amplitude in the no speech than speech condition. Both MEG and EEG results support the theory of domain-specific speech perception for vowel and consonant category changes. For changes in syllable duration and frequency, both of which are important semantic and syntactic cues in the Finnish language, the MEG results suggest enhanced temporal processing of syllables compared to their no speech counterparts.
Keywords:
EEG,
Language,
MEG
Conference:
XI International Conference on Cognitive Neuroscience (ICON XI), Palma, Mallorca, Spain, 25 Sep - 29 Sep, 2011.
Presentation Type:
Poster Presentation
Topic:
Poster Sessions: Neural Bases of Language
Citation:
Kuuluvainen
S,
Nevalainen
P,
Sorokin
A,
Krohn
K,
Mittag
M,
Partanen
E,
Putkinen
V,
Seppänen
M,
Kähkönen
S and
Kujala
T
(2011). Domain specificity of speech processing: a combined MEG-EEG study.
Conference Abstract:
XI International Conference on Cognitive Neuroscience (ICON XI).
doi: 10.3389/conf.fnhum.2011.207.00192
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Received:
19 Nov 2011;
Published Online:
28 Nov 2011.
*
Correspondence:
Dr. Soila Kuuluvainen, Cognitive Brain Research Unit, Institute of Behavioral Sciences, University of Helsinki, Helsinki, Finland, soila.kuuluvainen@helsinki.fi