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Digital Handwriting Analysis of Characters in Chinese Patients with Mild Cognitive Impairment
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A crossed Kana agraphia.

K Abe1, R Yokoyama2, T Yanagihara1

  • 1Department of Neurology, Osaka University Medical School, Osaka, Japan.

Behavioural Neurology
|February 4, 2014
PubMed
Summary
This summary is machine-generated.

A right-handed man experienced selective Kana agraphia due to a right cerebral hemisphere infarct. This suggests partial language lateralization to the right hemisphere in some individuals.

Keywords:
Crossed agraphiaGraphic centerKanaLanguage lateralization

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Area of Science:

  • Neuroscience
  • Neurolinguistics
  • Cognitive Psychology

Background:

  • Language processing is typically left-lateralized in right-handed individuals.
  • Aphasia and agraphia are common consequences of left hemisphere lesions.
  • The role of the right hemisphere in language remains an area of active investigation.

Purpose of the Study:

  • To investigate the potential for right hemisphere language lateralization in right-handed individuals.
  • To characterize the specific language deficits resulting from a non-dominant hemisphere lesion.
  • To explore the relationship between lesion location and selective agraphia.

Main Methods:

  • Case study of a right-handed man with aphasia following a right cerebral hemisphere infarct.
  • Neuroimaging (MRI) to identify the lesion location.
  • Comprehensive neuropsychological testing assessing comprehension, reading, and writing of both Kana (phonograms) and Kanji (ideograms).

Main Results:

  • The patient developed selective Kana agraphia, with errors involving substitutions and preserved word recall.
  • Kanji writing, reading, and comprehension remained intact.
  • The lesion was localized to the right Wernicke's area, yet the patient did not exhibit aphasia.

Conclusions:

  • Selective Kana agraphia can result from lesions in the non-dominant right cerebral hemisphere.
  • These findings support the hypothesis that language functions, particularly phonogram processing, may be partially lateralized to the right hemisphere in some right-handed individuals.
  • This case highlights the complexity of cerebral language lateralization and individual variability.