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Related Experiment Videos

Hemispheric processing strategies for lexical decisions among elderly persons.

M P Rastatter1, R A McGuire

  • 1Department of Communication Disorders, Bowling Green State University, OH 43403.

Perceptual and Motor Skills
|December 1, 1992
PubMed
Summary

This study reinterprets elderly subjects' data on word processing, suggesting processing strategy variations, not right hemisphere decline, explain observed differences in lexical decision tasks.

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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Linguistics

Background:

  • Previous research suggested age-related decline in right-hemispheric processing based on lexical decision tasks.
  • Rastatter and McGuire's 1990 study presented concrete and abstract words to young and elderly adults.

Purpose of the Study:

  • To re-evaluate elderly subjects' lexical decision data using visual information-processing theory.
  • To propose an alternative explanation for observed differences in word processing between young and elderly adults.

Main Methods:

  • Lexical decision vocal reaction times were measured.
  • Tachistoscopic presentation of concrete and abstract words was used.
  • Data from 30 young adults and 18 elderly subjects were analyzed.

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Main Results:

  • Young adults' data indicated differential right-hemispheric processing.
  • Elderly subjects' data were previously interpreted as right hemisphere functional loss.
  • Reinterpretation suggests processing strategy variations explain elderly data.

Conclusions:

  • Age-related differences in lexical decision tasks may stem from varied processing strategies.
  • Visual information-processing theory provides a more comprehensive account of elderly cognitive data.
  • The right hemisphere's processing function may not decline with age as previously thought.