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Interictal perceptual function in epilepsy.

Arthur C Grant1

  • 1Department of Neurology, University of California-Irvine, 101 The City Drive, Building 53, Room 226, Orange, CA 92868, USA. grantac@uci.edu

Epilepsy & Behavior : E&B
|May 24, 2005
PubMed
Summary
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Epilepsy can impact senses, causing both reduced ability and heightened sensitivity between seizures. These perceptual changes are often linked to specific epilepsy types, suggesting a network-based neurological disorder.

Area of Science:

  • Neuroscience
  • Neurology
  • Epileptology

Background:

  • Epilepsy is characterized by recurrent seizures, often accompanied by alterations in perception during seizures (ictal events).
  • However, perceptual function between seizures (interictal) can also be affected in individuals with epilepsy.
  • Understanding these interictal disturbances is crucial for a comprehensive view of epilepsy's impact.

Purpose of the Study:

  • To review the English-language literature on interictal perceptual disturbances in epilepsy.
  • To explore the correlation between specific epilepsy syndromes and affected sensory modalities.
  • To discuss potential mechanisms and implications of interictal perceptual dysfunction.

Main Methods:

  • Systematic review of English-language studies on interictal perceptual disturbances in epilepsy.

Related Experiment Videos

  • Analysis of reported perceptual abilities (impairment and heightened sensitivity).
  • Correlation of sensory modality deficits with epilepsy syndromes (e.g., temporal lobe epilepsy, occipital lobe epilepsy).

    • Main Results:

    • Most studies report impaired perceptual abilities in epilepsy, but heightened sensitivity is also documented.
    • A strong correlation exists between the affected sensory modality and the underlying epilepsy syndrome.
    • Olfactory disturbances are common in temporal lobe epilepsy, while visual processing issues occur in occipital lobe epilepsy.

    Conclusions:

    • Interictal perceptual disturbances are a feature of epilepsy, supporting the view of epilepsy as a network disease.
    • These disturbances may result from propagating epileptiform discharges affecting neural circuits beyond the seizure focus.
    • Psychophysical perceptual tasks can offer insights into the cognitive effects of epilepsy syndromes and epilepsy surgery.