A term used during the era of mesmerism to denote a " synaesthesia or " extracampine hallucination which is interpreted as an instance of veridical perception by means of other than the usual sense organs. This extraordinary mode of perceiving was first conceptualized and described in 1785 by a French army captain named Jean-François Tardy de Montravel, who claimed that during a half-waking trance he was able to see "with the pit of his stomach" (i.e. the plexus solaris). In 1808 the French physician Jacques Pététin (1744-1808) published an entire collection of such cases, including one in which taste, smell, and hearing were found to wander from the stomach to the fingertips and the toes. Later, many other descriptions of this type were published, most of them in association with somnambulism or hysteria.
References
Lombroso, C. (1922). Hypnotisme et spiritisme. Traduit par Rossigneux, Ch. Paris: Ernest Flammarion, Éditeur.
Dictionary of Hallucinations. J.D. Blom. 2010.