E

Abstract

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.