A woman aged 20, first presenting with what appeared to be hysterical blindness as part of the syndrome of hysterical pseudo-dementia, soon showed the picture of speech-prompt catatonia, one of the subtypes of chronic schizophrenia described by Karl Leonhard. However, within a short time the neurological, EEG and laboratory findings indicated that the condition was one of subacute sclerosing panencephalitis.
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Koehler et al. (1976) studied this question.
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