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Related Experiment Videos

Parallel distributed processing and lexical-semantic effects in visual word recognition: are a few stages necessary?

Ron Borowsky1, Derek Besner

  • 1Psychology Department, University of Saskatchewan, Saskatoon, SK, Canada. ron.borowsky@usask.ca

Psychological Review
|February 16, 2006
PubMed
Summary

This study critiques a parallel distributed processing model for lexical decision tasks. The model fails to account for word discrimination and semantic system damage, suggesting a stages-of-processing account is superior.

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Area of Science:

  • Cognitive Psychology
  • Computational Neuroscience
  • Psycholinguistics

Background:

  • A parallel distributed processing (PDP) model by Plaut and Booth (2000) aimed to simulate human lexical decision performance.
  • This model proposed a single mechanism to explain reaction time (RT) effects from semantic priming, word frequency, and stimulus quality.
  • It challenged the necessity of a stages-of-processing account for additive effects in lexical decision tasks.

Purpose of the Study:

  • To critically evaluate the Plaut and Booth (2000) PDP model of lexical decision.
  • To identify limitations and inconsistencies of the model's single-mechanism account.
  • To argue for the continued relevance of a stages-of-processing framework.

Main Methods:

  • Theoretical analysis and critique of the Plaut and Booth (2000) model.

Related Experiment Videos

  • Examination of the model's ability to discriminate between words and nonwords with similar orthography.
  • Comparison of the model's representational level with findings from patients with semantic system damage.
  • Review of existing research results that challenge the single-mechanism account.

    • Main Results:

    • The model lacks evidence for discriminating words from orthographically similar nonwords while maintaining claimed RT effects.
    • The model's representational level is inconsistent with how skilled readers with semantic deficits perform lexical decisions.
    • Several empirical findings are difficult to reconcile with the model's proposed single mechanism.

    Conclusions:

    • The Plaut and Booth (2000) PDP model has significant limitations in explaining lexical decision phenomena.
    • The model's single-mechanism account is insufficient to capture the complexity of word recognition.
    • A stages-of-processing account remains a more viable framework for understanding reaction time effects in lexical decision tasks.