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Vestibular processing in human paramedian precuneus as shown by electrical cortical stimulation
G Wiest1, F Zimprich, D Prayer
1Department of Neurology, University of Vienna, Austria. gerald.wiest@univie.ac.at
Neurology
|February 12, 2004
Summary
Epileptic seizures causing sensations of self-motion and body tilts were linked to a brain tumor. This tumor in the precuneus area of the brain was surgically removed, resolving the symptoms.
Area of Science:
- Neuroscience
- Epileptology
- Vestibular System Research
Background:
- Epileptic phenomena can manifest with unusual sensory experiences.
- The precuneus's role in vestibular processing is not fully understood.
Observation:
- A 16-year-old patient experienced recurrent epileptic episodes of linear self-motion perception and body tilts.
- Intracranial seizure monitoring identified the seizure onset in the right paramedian precuneus, associated with an ependymoma.
Findings:
- Electrical cortical stimulation of the affected right paramedian precuneus reproduced the patient's vestibular sensations.
- Surgical removal (lesionectomy) of the ependymoma led to the cessation of these epileptic symptoms.
Implications:
- The right paramedian precuneus is implicated in processing vestibular information, likely including otolithic input.
- This finding contributes to understanding the neuroanatomical basis of vestibular perception and epileptic auras.