@Article{Georgopoulos1986,
  author   = {A. P. Georgopoulos and A. B. Schwartz and R. E. Kettner},
  journal  = {Science},
  title    = {Neuronal population coding of movement direction.},
  year     = {1986},
  number   = {4771},
  pages    = {1416-9},
  volume   = {233},
  abstract = {Although individual neurons in the arm area of the primate motor cortex
	are only broadly tuned to a particular direction in three-dimensional
	space, the animal can very precisely control the movement of its
	arm. The direction of movement was found to be uniquely predicted
	by the action of a population of motor cortical neurons. When individual
	cells were represented as vectors that make weighted contributions
	along the axis of their preferred direction (according to changes
	in their activity during the movement under consideration) the resulting
	vector sum of all cell vectors (population vector) was in a direction
	congruent with the direction of movement. This population vector
	can be monitored during various tasks, and similar measures in other
	neuronal populations could be of heuristic value where there is a
	neural representation of variables with vectorial attributes.},
  keywords = {Animals, Arm, Macaca mulatta, Mathematics, Models, Motor Cortex, Motor Neurons, Neurological, Non-P.H.S., Non-U.S. Gov't, P.H.S., Research Support, U.S. Gov't, 3749885},
}

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