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About one-half (48%) of late post-traumatic cases have abnormal EEGs. The presence of fracture or unconsciousness does not appreciably alter this percentage. Post-traumatic cases with epilepsy have a higher percentage of abnormal EEGs. and post-traumatic cases with headache have a lower percentage of abnormal EEGs. than the average. Post-traumatic cases with psychosis have a slightly greater percentage of abnormal EEGs. than do those without psychosis.
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Milton Greenblatt (1943) studied this question.
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