Extended physiological proprioception (EPP) is a concept pioneered by D.C. Simpson (1972) to describe the ability to perceive at the tip of the tool, in this case a prosthetic limb. The work was based on pneumatic prosthesis developed in response to disabilities incurred by infants as the result of use of the drug, thalidomide, by mothers from 1957 to 1962.
DC Simpson and others, The choice of control system for the multimovement prosthesis: extended physiological proprioception (epp) The control of upper-extremity prostheses and orthoses C. Thomas (1974)
Dick H. Plettenburg, ``Prosthetic control: a case for Extended Physiological Proprioception. MEC '02 The Next Generation, Proceedings of the 2002 MyoElectric Controls/Powered Prosthetics Symposium IBME, University of New Brunswick (2002) http://hdl.handle.net/10161/2669