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Related Experiment Videos

Contingent negative variation in epilepsy

M E Drake1, S J Weate, S A Newell

  • 1Department of Neurology and Psychiatry, Ohio State University Medical Center, Columbus, USA.

Seizure
|August 1, 1997
PubMed
Summary
This summary is machine-generated.

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Contingent negative variation (CNV) event-related potentials were reduced in epilepsy patients, especially those with behavioral issues. Post-imperative negative variation was more frequent in patients, particularly with psychosis.

Area of Science:

  • Neuroscience
  • Clinical Electrophysiology
  • Epileptology

Background:

  • The contingent negative variation (CNV) is a slow negative cortical potential.
  • CNV is sensitive to attention, expectation, and motor preparation.
  • CNV alterations may indicate neurological or psychiatric dysfunction.

Purpose of the Study:

  • To investigate CNV differences in patients with epilepsy compared to controls.
  • To examine the impact of behavioral symptoms on CNV measures in epilepsy.
  • To assess the prevalence of post-imperative negative variation (PINV) in epilepsy.

Main Methods:

  • Recorded CNV from 50 epilepsy patients and 20 healthy controls.
  • Used a tone-flash paradigm with a button-press response.

Related Experiment Videos

  • Analyzed CNV amplitude and area under the curve (AUC), and PINV occurrence.

    • Main Results:

    • Epilepsy patients showed reduced CNV amplitude and AUC compared to controls.
    • Interictal behavioral symptoms were associated with smaller AUC and lower amplitude.
    • Depressed patients had lower CNV amplitude; psychotic patients had lower AUC.
    • PINV was more common in epilepsy patients, particularly those with psychosis.

    Conclusions:

    • CNV measures are altered in complex partial and secondarily generalized seizures.
    • Interictal behavioral disturbances significantly affect CNV.
    • PINV may be a useful marker in epilepsy, especially with psychosis.