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Related Experiment Videos

Lesion localization in apractic agraphia.

M P Alexander1, R S Fischer, R Friedman

  • 1Aphasia Program, Braintree Hospital, MA.

Archives of Neurology
|March 1, 1992
PubMed
Summary
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Apractic agraphia, a writing disorder, results from abnormal letter and word production despite intact basic functions. Lesions in the superior parietal lobule typically cause this condition.

Area of Science:

  • Neurology
  • Cognitive Neuroscience
  • Clinical Linguistics

Background:

  • Apractic agraphia is a specific writing impairment characterized by abnormal orthographic production.
  • It occurs despite preserved sensorimotor abilities, visual feedback, and lexical knowledge.

Observation:

  • This report details one case of apractic agraphia.
  • A review of existing clinicoanatomical literature was also conducted.

Findings:

  • Analysis of available cases supports the hypothesis that apractic agraphia is linked to disorders of spatially and kinesthetically modulated movements.
  • Lesions in the superior parietal lobule, typically in the language-dominant hemisphere, are implicated as the cause.

Implications:

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  • Understanding the neural basis of apractic agraphia provides insights into the motor control of writing.
  • This research contributes to the broader understanding of disorders affecting skilled motor actions and their anatomical correlates.