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Automatic adjustments toward unseen visual targets during grasping movements

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Abstract

We investigated whether control of hand movements can be driven by visual information that is not consciously perceived. Subjects performed reach-to-grasp movements toward 2D virtual objects that were projected onto a rigid surface. On perturbed trials, the target object was briefly presented at a different orientation (±20° rotation) or different size (±20 % scaling) during movement. The perturbed objects were presented for 33 ms, followed by a 200-ms mask and reappearance of the original target object. Subjects perceived only the mask and were not aware of the preceding perturbed stimuli. Unperturbed trials were identical except that there was no change in the target object before the mask. Despite being unaware of the brief perturbed stimuli, subjects showed corrective adjustments to their movements: rotation of the grip axis in response to orientation perturbations, and scaling of grip aperture in response to size perturbations. Responses were detectable 250–300 ms after the perturbation onset and began to reduce 250–300 ms after the reappearance of the original target. Our results demonstrate that the visuomotor system can utilize visual information for control of grasping even when this information is not available for conscious perception. We suggest that this dissociation is due to different temporal resolution of visual processing mechanisms underlying conscious perception and control of actions.

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Acknowledgements

This work was supported by a grant from the Hong Kong Research Grants Council, GRF HKU-753211H.

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  1. Department of Psychology, University of Hong Kong, Hong Kong, Hong Kong SAR

    Zhongting Chen & Jeffrey A. Saunders

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  1. Zhongting Chen
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  2. Jeffrey A. Saunders
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Correspondence to Jeffrey A. Saunders.

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Chen, Z., Saunders, J.A. Automatic adjustments toward unseen visual targets during grasping movements. Exp Brain Res 234, 2091–2103 (2016). https://doi.org/10.1007/s00221-016-4613-9

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