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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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Cascading activation from lexical processing to letter-level processing in written word production.

Adam Buchwald1, Carolyn Falconer

  • 1a Department of Communicative Sciences and Disorders , New York University , New York , NY , USA.

Cognitive Neuropsychology
|August 29, 2014
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Summary

This study reveals cascading activation in written language production, showing how lexical errors impact letter accuracy in individuals with acquired dysgraphia. This finding offers new insights into the writing process.

Keywords:
Cascading activationDysgraphiaSpelling

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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Linguistics

Background:

  • Spoken language production research indicates interaction between lexical and phoneme-level processing.
  • Written language production interaction remains less understood.
  • Acquired dysgraphia offers a unique window into these processes.

Observation:

  • An individual with acquired dysgraphia exhibited both lexical-semantic and letter-level errors during writing-to-dictation tasks.
  • The participant's errors suggest impairments in both lexical selection and letter formation.
  • Analysis revealed cascading activation from lexical to letter-level processing.

Findings:

  • Lower letter accuracy was observed for weakly activated lexemes compared to strongly activated ones.
  • Weakly activated lexemes were identified as those producing lexical-semantic errors.
  • Strongly activated lexemes were those where the intended word was correctly selected.

Implications:

  • This research provides novel evidence for cascading activation in written language production.
  • Findings contribute to understanding the cognitive mechanisms underlying writing and dysgraphia.
  • The study highlights the interconnectedness of lexical and sublexical processes in writing.