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Related Experiment Videos

Hemispheric differences in context sensitivity during lexical ambiguity resolution

D Titone1

  • 1Harvard Medical School and McLean Hospital. dtitone@mclean.harvard.edu

Brain and Language
|December 9, 1998
PubMed
Summary
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This study explored how sentence context affects word meaning selection in the brain. Results show the left and right hemispheres process ambiguous words differently based on context.

Area of Science:

  • Neuroscience
  • Psycholinguistics
  • Cognitive Science

Background:

  • Lexical ambiguity resolution is crucial for language comprehension.
  • The role of cerebral hemispheres in processing word meanings remains an active area of research.
  • Contextual constraint is hypothesized to influence how semantic information is accessed.

Purpose of the Study:

  • To investigate the impact of contextual constraint on lexical ambiguity resolution.
  • To examine hemispheric differences in processing dominant and subordinate word meanings.
  • To test a context-sensitive model of language processing.

Main Methods:

  • Utilized a cross-modal priming variant of the divided visual field task.
  • Subjects performed lexical decisions on targets related to homonym meanings.

Related Experiment Videos

  • Manipulated sentence contexts to vary semantic bias (neutral, central, peripheral).

    • Main Results:

    • Experiment 1: Both hemispheres primed dominant meanings in neutral contexts.
    • Experiment 2: Both hemispheres primed dominant and subordinate meanings with central semantic bias.
    • Experiment 3: Left hemisphere (LH) primed dominant meanings; right hemisphere (RH) primed subordinate meanings with peripheral semantic bias.

    Conclusions:

    • Hemispheric sensitivity to semantic relationships differs based on contextual constraint.
    • Results support a context-sensitive model of language processing.
    • Differential processing of semantic features in the LH and RH was observed.