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Related Experiment Videos

Photogenic partial seizures.

M J Hennessy1, C D Binnie

  • 1Department of Clinical Neurophysiology, Kings College Hospital, London, England, UK.

Epilepsia
|January 22, 2000
PubMed
Summary
This summary is machine-generated.

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Visually triggered seizures, often starting with maintained consciousness, are common in photosensitive epilepsy. These seizures suggest the visual cortex is the primary site for photosensitive epilepsy.

Area of Science:

  • Neurology
  • Epileptology
  • Neurophysiology

Background:

  • Photosensitivity is a known trigger for seizures in some epilepsy patients.
  • Environmental visual stimuli like TV screens can precipitate seizures.

Purpose of the Study:

  • To determine the incidence and symptoms of partial seizures in patients with known photosensitivity.
  • To investigate seizures triggered by intermittent photic stimulation or environmental visual stimuli.

Main Methods:

  • Studied 43 consecutive epilepsy patients with photoparoxysmal response or visually triggered seizures.
  • Assessed photosensitivity in an EEG laboratory and questioned patients about ictal symptoms.

Main Results:

  • 65% of patients reported visually precipitated attacks, often starting with maintained consciousness.

Related Experiment Videos

  • Common visual symptoms included positive phenomena (spots, circles) and subjective experiences ('eyes going funny').
  • No patient reported spontaneous partial seizures; epilepsy was inferred from visually induced attack phenomenology.

    • Conclusions:

    • Findings support the visual cortex as the primary epileptogenic site in photosensitive epilepsy.
    • The trigger mechanism for photosensitivity involves binocularly innervated visual cortex cells.
    • Photic-triggered seizures are considered partial, potentially leading to secondary generalization.