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Related Experiment Video

Updated: Jun 27, 2026

Behavioral Assessment of Manual Dexterity in Non-Human Primates

Behavioral Assessment of Manual Dexterity in Non-Human Primates

Published on: November 11, 2011

Differential hand-neglect after a callosal lesion.

Michitaka Funayama¹, Taro Muramatsu, Motoichiro Kato

¹Department of Neuropsychiatry, Ashikaga Red Cross Hospital, Ashikaga-City, Tochigi, Japan. Fimndia@aol.com

Cognitive and Behavioral Neurology : Official Journal of the Society for Behavioral and Cognitive Neurology

|December 6, 2008

Summary

A stroke affecting the corpus callosum caused severe left-sided spatial neglect in a patient. This suggests the corpus callosum plays a crucial role in spatial attention and interhemispheric communication.

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Area of Science:

Neuroscience
Neurology
Neuroanatomy

Background:

The precise link between callosal lesions and hemispatial neglect remains unclear.
Investigating this relationship offers insights into brain lateralization and attention networks.

Observation:

A 74-year-old female patient experienced a right pericallosal artery infarction.
This resulted in damage to the corpus callosum (genu and truncus) and right cingulate sulcus.

Findings:

Three years post-infarction, the patient displayed severe left-sided unilateral spatial neglect affecting the right hand.
Mild right-sided unilateral spatial neglect was observed for the left hand.

Implications:

Findings support the theory of right hemisphere dominance in spatial attention.
The corpus callosum lesion may be the direct cause of the observed disconnection neglect.