Lethargic phenomena have often been studied and described in connection with hysteria and hypnotism. It has been pointed out by hypnotists that a state of lethargy occurs at times which takes its own time to disappear. Lethargic states in hysterical persons, whether under the influence of hypnotism or not, are not rare. According to Charcot's classical descriptions the lethargic state can be produced artificially during hypnosis by closing the eyes in the cataleptic phase, but it can likewise be primarily caused by fixation. During the lethargic state consciousness is obscured, sensitivity to pain is diminished, and the tendon reflexes are increased.
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