Supernumerary phantom limb

Supernumerary phantom limb is a condition where the affected individual believes they are receiving sensory information from limbs of the body that do not actually exist, and never have existed, in contradistinction to phantom limbs, which appear after an individual has had a limb removed from the body and still receives input from it. An fMRI study of a subject with a supernumerary phantom left arm was done by Khateb et al.

Source: Wikipedia — Supernumerary phantom limb (CC BY-SA 4.0)