Paradoxical adaptation of successful movements: The crucial role of internal error signals

Consciousness and Cognition
Valérie GaveauYves Rossetti

Abstract

Visuo-motor adaptation has been classically studied using movements aimed at visual targets with visual feedback. In this type of experimental design, the respective roles of the different error signals cannot be fully disentangled. Here, we show that visuo-motor adaptation occurs despite the terminal success of the action and the compensation of the external error by a jump of the visual target. By using three grasping task conditions we manipulated the retinal error signal between the seen hand and the target (external error) and the conflict between the hand's visual reafference and either the proprioceptive or the efference copy signal (internal error), in order to estimate their respective roles in prism adaptation. In all conditions, subjects were asked to rapidly grasp an object. In the classical 'Prism' condition the object was stationary, which provided both external and internal errors. In the 'Prism & Jump' condition, at movement onset the object was suddenly displaced (jump) toward its virtual image location (visually displaced by the prism) which also corresponded to the location where the movement was planned to and executed through prisms. This jump therefore cancelled the external error (between the seen target ...Continue Reading

Citations

Dec 31, 2020·Journal of Cognitive Neuroscience·Francesco PanicoYves Rossetti
Feb 2, 2019·Cortex; a Journal Devoted to the Study of the Nervous System and Behavior·Yves RossettiTanja Nijboer
May 28, 2019·Cortex; a Journal Devoted to the Study of the Nervous System and Behavior·Alessio FacchinAlessandro Farnè
Sep 17, 2019·Cortex; a Journal Devoted to the Study of the Nervous System and Behavior·Lisa FleuryAnne-Emmanuelle Priot
May 23, 2021·The European Journal of Neuroscience·Li-Ann LeowWelber Marinovic

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