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• W2192939976 abstract "In human reach-to-grasp movement, visual occlusion of a target object leads to a larger peak grip aperture compared to conditions where online vision is available. However, no previous computational and neural network models for reach-to-grasp movement explain the mechanism of this effect. We simulated the effect of online vision on the reach-to-grasp movement by proposing a computational control model based on the hypothesis that the grip aperture is controlled to compensate for both motor variability and sensory uncertainty. In this model, the aperture is formed to achieve a target aperture size that is sufficiently large to accommodate the actual target; it also includes a margin to ensure proper grasping despite sensory and motor variability. To this end, the model considers: i) the variability of the grip aperture, which is predicted by the Kalman filter, and ii) the uncertainty of the object size, which is affected by visual noise. Using this model, we simulated experiments in which the effect of the duration of visual occlusion was investigated. The simulation replicated the experimental result wherein the peak grip aperture increased when the target object was occluded, especially in the early phase of the movement. Both predicted motor variability and sensory uncertainty play important roles in the online visuomotor process responsible for grip aperture control." @default.
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• W2192939976 date "2015-12-10" @default.
• W2192939976 modified "2023-09-23" @default.
• W2192939976 title "A Computational Model for Aperture Control in Reach-to-Grasp Movement Based on Predictive Variability" @default.
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• W2192939976 doi "https://doi.org/10.3389/fncom.2015.00143" @default.
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