earthquake
   A term introduced in or shortly before 1951 by the American neurologist Caro W. Lippman (1886-1954) to denote a shaking sensation or shock movement which suggests that the bed -or the entire room - is shaking violently. This *kinaesthetic hallucination tends to occur during the period of relaxation prior to sleep onset, to last for half a minute or more, and to fade away gradually. Because of its association with migraine, the earthquake may be considered an * aural phenomenon. Lippman himself classifies it as a * space-motion hallucination.
   References
   Lippman, C.W. (1951). Hallucinations in migraine. American Journal of Psychiatry, 107, 856-858.

Dictionary of Hallucinations. . 2010.

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