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Lexical Decision Task for Studying Written Word Recognition in Adults with and without Dementia or Mild Cognitive Impairment
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Additive and interactive effects on response time distributions in visual word recognition.

Melvin J Yap1, David A Balota

  • 1Department of Psychology, Washington University, St. Louis, MO 63130, USA.

Journal of Experimental Psychology. Learning, Memory, and Cognition
|March 14, 2007
PubMed
Summary

Stimulus quality and word frequency affect word recognition differently across tasks. Lexical decision shows separate effects, while pronunciation and classification show interactive effects, suggesting task-specific processing.

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Area of Science:

  • Cognitive Psychology
  • Psycholinguistics
  • Computational Neuroscience

Background:

  • Word recognition involves complex cognitive processes influenced by various factors.
  • Stimulus quality and word frequency are known to impact response times in word recognition tasks.
  • Existing models propose different mechanisms for how these factors interact.

Purpose of the Study:

  • To investigate the joint effects of stimulus quality and word frequency on response time distributions.
  • To compare these effects across three distinct word recognition tasks: lexical decision, speeded pronunciation, and semantic classification.
  • To test predictions derived from interactive activation models of lexical processing.

Main Methods:

  • Distributional analyses of response times were employed.
  • Three word recognition tasks were utilized to capture different aspects of lexical processing.
  • Statistical methods were used to examine additive versus interactive effects.

Main Results:

  • In lexical decision, stimulus quality and word frequency showed additive effects on both response time means and distributions.
  • This additive pattern supports an early, separate normalization process.
  • In speeded pronunciation and semantic classification, interactive effects were observed, aligning with interactive activation models.

Conclusions:

  • Stimulus normalization appears to be specific to lexical decision tasks.
  • The findings suggest that task demands, particularly the emphasis on familiarity-based information, shape cognitive processes.
  • This research provides nuanced insights into the interplay of stimulus properties and task context in word recognition.