Also known as phantom alloaesthesic sensation. Both terms stem from the Greek words phantasma (ghost, spectre), allos (other), and aisthanesthai (to notice, to perceive). They are used to denote a variant of alloaesthesia (i.e. *allachaesthesia) in which the affected individual experiences a tactile sensation below the stump of an amputated limb after tactile stimulation of the contralateral, remaining limb. Or, to mention an example given by the British neurologist Macdonald Critchley (1900-1997), the experience of stereognosic phantom sensations in the affected hand when an actual object is held in the normal hand". Phantom alloaesthesia should not be confused with allachaesthesia proper or with *spontaneous stereognosic sensations.
References
Critchley, M. (1953). The parietal lobes. London: Edward Arnold & Co.
Dictionary of Hallucinations. J.D. Blom. 2010.