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Memory traces for inflectional affixes as shown by mismatch negativity.
Yury Shtyrov1, Friedemann Pulvermüller
1MRC Cognition and Brain Sciences Unit, 15 Chaucer Road, Cambridge CB2 2EF, UK. yury@mrc-cbu.cam.ac.uk
The European Journal of Neuroscience
|March 29, 2002
Summary
Mismatch negativity (MMN) reveals how the brain processes grammatical affixes. Inflected verb forms elicit delayed MMN responses compared to verb stems, suggesting specific neural pathways for grammatical processing.
Area of Science:
- Neuroscience
- Psycholinguistics
- Cognitive Science
Background:
- Mismatch negativity (MMN) serves as a neural index for experience-dependent memory traces.
- Investigating grammatical affix processing offers insights into language comprehension mechanisms.
Purpose of the Study:
- To examine the brain's processing of grammatical affixes using MMN.
- To differentiate neural responses to verb stems versus inflected verb forms.
Main Methods:
- Eliciting MMN responses to both verb stems and inflected verb forms with identical phonetic contrasts.
- Analyzing the topography and latency of mismatch responses.
- Comparing MMN characteristics between stem and inflected conditions.
Main Results:
- MMN responses demonstrated clear left-hemispheric laterality for both verb stems and inflected forms.
- MMN to inflected verb forms occurred later than MMN to verb stems.
- Inflected stimuli produced MMN maximal at centroparietal sites, while stem MMN was maximal at frontal sites.
Conclusions:
- The findings suggest delayed activation of left-lateralized perisylvian networks for processing inflectional affixes.
- These neural networks likely represent cortical memory traces for grammatical morphology.
- MMN provides a valuable tool for understanding the neural basis of grammatical processing.