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Related Experiment Videos

Callosal neglect in hydrocephalus.

Yong Jeong1, Jack W Tsao, David B Efros

  • 1Department of BioSystems, Korea Advanced Institute of Science and Technology, Daejeon, Korea. yong@kaist.ac.kr

Neurocase
|December 22, 2006
PubMed
Summary
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Patients with hydrocephalus may exhibit callosal neglect due to corpus callosum thinning. Their left hand deviated leftward when bisecting lines in right space, unlike controls.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neurology

Background:

  • A functional disconnection of the corpus callosum (CC) can cause spatial neglect, characterized by hand deviation in the contralateral hemispace.
  • Callosal neglect has not been previously reported in patients with hydrocephalus, despite frequent CC thinning in this condition.

Observation:

  • Two patients with hydrocephalus and thinned CCs underwent a line bisection task alongside six matched controls.
  • Participants bisected lines in left, right, and center space using both their right and left hands.

Findings:

  • Neither hydrocephalus patient showed neglect in center or left space conditions with either hand when compared to controls.
  • Both patients exhibited a significant leftward deviation of their left hand when bisecting lines presented in right space.

Related Experiment Videos

Implications:

  • Hydrocephalic interhemispheric functional disconnection may manifest as a specific form of callosal neglect.
  • The observed hemispatial-hand asymmetry in deviation could potentially stem from the disinhibition of the attentionally dominant right hemisphere.