PMID-2376768[0] Making arm movements within different parts of space: dynamic aspects in the primate motor cortex
- monkeys made similar movements in different parts of external/extrinsic 3D space.
- change of preferred direction was graded in an orderly manner across extrinsic space.
- this change closely followed the changes in muscle activation required to effect the observed movements.
- motor cortical cells can code direction of movement in a way which is dependent on the position of the arm in space
- implies existence of mechanisms which facilitate the transformation between extrinsic (visual targets) and intrinsic coordinates
- also see [1]
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[0] Caminiti R, Johnson PB, Urbano A, Making arm movements within different parts of space: dynamic aspects in the primate motor cortex.J Neurosci 10:7, 2039-58 (1990 Jul)
[1] Caminiti R, Johnson PB, Galli C, Ferraina S, Burnod Y, Making arm movements within different parts of space: the premotor and motor cortical representation of a coordinate system for reaching to visual targets.J Neurosci 11:5, 1182-97 (1991 May)