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Lexical representation and morpho-syntactic parallelism in the left hemisphere

C Burgess1, J Skodis

  • 1Syracuse University.

Brain and Language
|February 1, 1993
PubMed
Summary

This study found that the right visual field, associated with the left hemisphere, processes ambiguous verb forms faster than unambiguous ones. This suggests left-hemispheric specialization extends to morphological processing.

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Area of Science:

  • Neuroscience
  • Psycholinguistics
  • Cognitive Science

Background:

  • The left cerebral hemisphere is traditionally associated with syntactic processing.
  • Morphological representations are crucial for understanding word structure and meaning.

Purpose of the Study:

  • To investigate hemispheric sensitivity to morphologically ambiguous versus unambiguous verbs.
  • To explore the role of the left hemisphere in processing lower-level morphological information.

Main Methods:

  • Utilizing a divided visual-field paradigm with normal subjects.
  • Presenting morphologically ambiguous (e.g., 'chased') and unambiguous (e.g., 'stolen') verbs.
  • Measuring lexical decision times for verb presentation in the right and left visual fields.

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Main Results:

  • Lexical decisions for ambiguous verbs were significantly faster than for unambiguous verbs.
  • This effect was observed exclusively when verbs were presented in the right visual field.
  • Right visual field processing is linked to left cerebral hemisphere function.

Conclusions:

  • Left-hemispheric specialization extends beyond syntax to include the retrieval of morphological representations.
  • The findings challenge traditional views by highlighting the left hemisphere's role in processing word morphology.
  • This research provides evidence for a broader role of the left hemisphere in language processing, encompassing morphology.