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Related Experiment Videos

Dissociation between linguistic and nonlinguistic gestural systems: a case for compositionality.

D P Corina1, H Poizner, U Bellugi

  • 1Salk Institute for Biological Studies, Los Angeles, CA.

Brain and Language
|October 1, 1992
PubMed
Summary

A left-hemisphere lesion in a deaf signer caused sign language aphasia but spared nonlinguistic gesture. This suggests distinct neural systems for language and gesture, supporting the compositionality hypothesis.

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Area of Science:

  • Neuroscience
  • Linguistics
  • Cognitive Science

Background:

  • Disorders of sign language are often studied separately from disorders of gesture and pantomime.
  • Understanding the neural basis of language and gesture is crucial for cognitive neuroscience.

Purpose of the Study:

  • To investigate the separability of sign language disorders from gesture and pantomime disorders.
  • To explore the neural mediation of language and gesture through a case study.

Main Methods:

  • Case study of a deaf signer with a left-hemisphere lesion.
  • Assessment of sign language production and comprehension.
  • Evaluation of nonlinguistic gesture and pantomime abilities.

Main Results:

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  • The lesion resulted in significant sign language aphasia, affecting both production and comprehension.
  • Nonlinguistic gesture and pantomime abilities remained largely intact.
  • Phonemic paraphasias were observed in sign language production, indicating structural dissolution absent in pantomime.

Conclusions:

  • The findings support the separability of linguistic sign production from nonlinguistic gesture.
  • Differences in compositionality may underlie the distinct neural processing of language and gesture.
  • The left hemisphere shows specialization for language-specific functions, including sign language.