[1] An fMRI study of a subject with a supernumerary phantom left arm was done by Khateb et al.[2] at the Laboratory of Experimental Neuropsychology at the University of Geneva.
When the subject was told to touch her right cheek with the phantom limb, there was increased activity in the motor cortex of her brain in the area roughly corresponding to the left arm.
At times during the experiment, the subject was asked to move the phantom limb to a location that was obstructed or otherwise unfeasible.
Apotemnophilia – the neurological basis of a ‘psychological’ disorder.
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