title: On the form of the internal model for reaching.
abstract: We investigated, by using simulations, possible mechanisms responsible for the errors in the direction of arm movements exhibited by deafferented patients. Two aspects of altered feedforward control were evaluated: the inability to sense initial conditions and the degradation of an internal model. A simulation which assumed no compensation for variations in initial arm configuration failed to reproduce the characteristic pattern of errors. In contrast, a simulation that assumed random variability in the generation of joint torque resulted in a distribution of handpaths which resembled some aspects of the pattern of errors exhibited by deafferented patients.
authors.affiliation: Department of Physiology, University of Minnesota, Minneapolis 55455, USA.
authors.forename: C A
authors.initials: CA
authors.lastname: Buneo
authors.forename: J
authors.initials: J
authors.lastname: Boline
authors.forename: J F
authors.initials: JF
authors.lastname: Soechting
authors.forename: R E
authors.initials: RE
authors.lastname: Poppele
mesh_terms: D001132:Arm / Q000294:innervation / Q000502:physiology; D004550:Elbow / Q000502:physiology; D006801:Humans; D008959:Models, Neurological; D009068:Movement / Q000502:physiology*; D009475:Neurons, Afferent / Q000502:physiology; D012782:Shoulder / Q000502:physiology