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Area of Science:

  • Linguistics
  • Psycholinguistics
  • Clinical Linguistics

Background:

  • Core lexicon measures are increasingly used to assess word retrieval in discourse.
  • Existing measures use varied criteria, necessitating standardized development.
  • Psychological robustness and statistical guidance are crucial for reliable measures.

Purpose of the Study:

  • To compare the frequency and percentage criteria for developing core lexicon measures.
  • To determine the most accurate criterion for measuring word retrieval ability in discourse.

Main Methods:

  • Developed core lexicon measures using frequency and percentage criteria across five word classes.
  • Applied measures to language samples from 470 healthy adults.
  • Utilized structural equation modeling to analyze word retrieval ability.

Main Results:

  • Both frequency and percentage criteria capture discourse-level word retrieval.
  • The percentage criterion yielded greater residual variances, indicating higher measurement error.
  • The frequency criterion demonstrated greater reliability for core nouns, verbs, adjectives, and adverbs.

Conclusions:

  • The frequency criterion is recommended for developing core lexicon measures for most word classes, excluding function words.
  • Findings are specific to measures using wordless picture book elicitation.
  • Further research should replicate this approach with different discourse elicitation tasks.