Inhibitory effect of central vision on occipital lobe seizures

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Abstract
Four young patients with occipital lobe seizures (elementary visual hallucinations, blindness and tonic deviation of the eyes) and EEG abnormalities of occipital spike and slow-wave activity, which occurred continuously as long as the eyes were closed were studied. The EEG abnormalities were inhibited by opened eyes in an illuminated room and returned immediately in darkness. Opening and closing the eyes in darkness did not alter the continuously occurring spike and slow-wave activity. The retention of central vision in darkness, caused by looking at a red spot of light, inhibited these abnormalities. Some occipital lobe seizures may not be spontaneous but may be elicited by loss of central vision, particularly when they occur in darkness or sleep.

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