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J Neurosci. 2016 Feb 24;36(8):2329-41. doi: 10.1523/JNEUROSCI.0052-15.2016.

Temporal Evolution of Spatial Computations for Visuomotor Control.

Author information

1
Computational and Biological Learning Laboratory, Department of Engineering, University of Cambridge, Cambridge CB2 1PZ, United Kingdom, dwf25@cam.ac.uk.
2
Motor Control Group, Institute of Cognitive Neuroscience, University College London, London WC1N 3AR, United Kingdom, and.
3
Computational and Biological Learning Laboratory, Department of Engineering, University of Cambridge, Cambridge CB2 1PZ, United Kingdom.
4
Motor Control Group, Institute of Cognitive Neuroscience, University College London, London WC1N 3AR, United Kingdom, and Brain and Mind Institute, Western University, London, Ontario N6A 5B7, Canada.

Abstract

Goal-directed reaching movements are guided by visual feedback from both target and hand. The classical view is that the brain extracts information about target and hand positions from a visual scene, calculates a difference vector between them, and uses this estimate to control the movement. Here we show that during fast feedback control, this computation is not immediate, but evolves dynamically over time. Immediately after a change in the visual scene, the motor system generates independent responses to the errors in hand and target location. Only about 200 ms later, the changes in target and hand positions are combined appropriately in the response, slowly converging to the true difference vector. Therefore, our results provide evidence for the temporal evolution of spatial computations in the human visuomotor system, in which the accurate difference vector computation is first estimated by a fast approximation.

KEYWORDS:

motor control; neural computations; visual processing; visuomotor

PMID:
26911681
PMCID:
PMC4764656
DOI:
10.1523/JNEUROSCI.0052-15.2016
[Indexed for MEDLINE]
Free PMC Article

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