Operant conditioning of a multiple degree-of-freedom brain-machine interface in a primate model of amputation. - Karthikeyan Balasubramanian; Joshua Southerland; Mukta Vaidya; Kai Qian; Ahmed Eleryan; Andrew H. Fagg; Marc W. Slutzky; Karim G. Oweiss; Nicholas G. Hatsopoulos (EMBC, 2013)