Direct visuomotor transformations for reaching

Christopher A. Buneo, Murray R. Jarvis, Aaron P. Batista and Richard A. Andersen
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Aaron P. Batista: Stanford University School of Medicine
Richard A. Andersen: California Institute of Technology

Nature, 2002, vol. 416, issue 6881, 632-636

Abstract: Abstract The posterior parietal cortex (PPC) is thought to have a function in the sensorimotor transformations that underlie visually guided reaching, as damage to the PPC can result in difficulty reaching to visual targets in the absence of specific visual or motor deficits1. This function is supported by findings that PPC neurons in monkeys are modulated by the direction of hand movement, as well as by visual, eye position and limb position signals2,3,4,5,6,7,8,9. The PPC could transform visual target locations from retinal coordinates to hand-centred coordinates by combining sensory signals in a serial manner to yield a body-centred representation of target location10,11,12, and then subtracting the body-centred location of the hand. We report here that in dorsal area 5 of the PPC, remembered target locations are coded with respect to both the eye and hand. This suggests that the PPC transforms target locations directly between these two reference frames. Data obtained in the adjacent parietal reach region (PRR) indicate that this transformation may be achieved by vectorially subtracting hand location from target location, with both locations represented in eye-centred coordinates.

Date: 2002
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DOI: 10.1038/416632a

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