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Related Experiment Video

Updated: Jul 17, 2026

Lexical Decision Task for Studying Written Word Recognition in Adults with and without Dementia or Mild Cognitive Impairment

Lexical Decision Task for Studying Written Word Recognition in Adults with and without Dementia or Mild Cognitive Impairment

Published on: June 25, 2019

Impairment in writing, but not reading, morphologically complex words.

A Cris Hamilton¹, H Branch Coslett

¹Department of Neurology, 3400 Spruce St., Philadelphia, PA 19104, USA. andc@mail.med.upenn.edu

Neuropsychologia

|January 16, 2007

Summary

This study examines phonological dyslexia, revealing a patient impaired in writing affixed words but not reading them. The findings suggest distinct brain pathways for reading and writing complex words.

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Area of Science:

Psycholinguistics
Neurolinguistics
Cognitive Science

Background:

Investigating the cognitive processes underlying word production and comprehension.
Exploring the role of morphology in lexical processing for reading and writing.
Examining dissociations between reading and writing abilities in acquired dyslexia.

Observation:

A patient, FP, with phonological dyslexia presented with significant difficulties in writing affixed words to dictation.
FP showed no comparable deficit when reading affixed words.
The patient exhibited greater impairment in writing regularly inflected words compared to irregularly inflected and derived words.

Findings:

The patient's writing impairment was specifically linked to morphological complexity.
Findings support models of lexical processing that propose decomposition of morphologically complex words.
Evidence suggests that lexical representations for reading and writing are at least partially dissociable.

Implications:

This case provides crucial insights into the neural architecture of language processing.
Highlights the distinct cognitive mechanisms involved in producing versus comprehending morphologically complex words.
Suggests potential therapeutic targets for individuals with dyslexia and related writing impairments.