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This diagnosis was based on characteristic history, occurrence of several convulsive o r other paroxysmal seizure episodes reported by qualified observers, pertinent data on medical record and, in many instances, direct observation of patients during ictal episodes by members of the EEG Laboratory. Epilepsia, 1970,ll: 361-381 RESULTS General findingsOn the basis of the criteria described above the patients were subdivided into three main groups: (1) with all positive records, (2) with all negative records and (3) with * Epileptiform activity includes all forms of paroxysmal discharges (spikes, sharp waves, spike-wave complexes, prolonged runs of paroxysmal rhythms as seen in electrographic seizures), both focal and generalized. Records were considered "positive" only if such type of activity was present. Both records with non-paroxysmal abnormalities and borderline or normal records were considered "negative" for the purpose of this study (see DISCUSSION).Epilepsiu, 1970, 11: 361-381