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A retrospective study of 14 patients with epileptic seizures and 11 with nonepileptic seizures, all taking antiepileptic drugs, found epileptic patients had significantly longer P160, N200, and P300 latencies on auditory event-related potential recordings. Patients with nonepileptic seizures had generally higher IQs and significantly greater psychopathology on neuropsychological scales.
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Drake et al. (1993) studied this question.
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