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Related Experiment Videos

Hyperexcitatory activity in visual cortex in homonymous hemianopia after stroke.

C Braun1, J Weber, U Schiefer

  • 1Institute of Medical Psychology and Behavioral Neurobiology, University of Tübingen, Otfried-Müller-Strasse 47, 72076, Tübingen, Germany. christoph.braun@uni-tuebingen.de

Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology
|February 13, 2001
PubMed
Summary

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Brain lesions in the visual pathway can cause increased activity in the visual cortex due to disinhibition. This cortical disinhibition may play a role in the brain

Area of Science:

  • Neuroscience
  • Visual System Research
  • Brain Injury Studies

Background:

  • Neural afferent damage disrupts sensory input, reducing cortical activity.
  • Sensory pathway lesions can cause disinhibition, leading to augmented cortical activity.
  • Disinhibition is implicated in neural network reconfiguration and functional recovery after brain lesions.

Purpose of the Study:

  • Investigate the effects of visual pathway lesions on visual cortex activity.
  • Examine the role of cortical disinhibition in brain lesion recovery.
  • Understand neural activity changes following homonymous hemianopia.

Main Methods:

  • Utilized magnetoencephalography (MEG) to study visual cortex activity.
  • Examined patients with unilateral, post-chiasmatic lesions causing homonymous hemianopia.

Related Experiment Videos

  • Compared neural activity in lesioned areas with intact visual processing.

    • Main Results:

    • Reduced magnetic activity observed when stimulating within the scotoma (lesioned area).
    • Increased magnetic activity detected when stimulating the border region of the scotoma.
    • Hyperactivity in the visual cortex correlated with lesion-induced disinhibition.

    Conclusions:

    • Cortical hyperactivity following visual pathway lesions reflects disinhibition.
    • Cortical disinhibition may serve as a basis for neural reorganization.
    • Disinhibition could be a prerequisite for restoring impaired visual functions.