Abstract
The Dual Visuomotor Channel theory proposes that skilled reaching is composed of a Reach that directs the hand in relation to the extrinsic properties of an object (e.g., location) and a Grasp that opens and closes the hand in relation to the intrinsic properties of an object (e.g., size). While Reach and Grasp movements are often guided by vision, they can also be performed without vision when reaching for a body part or an object on one’s own body. Memory of a recently touched but unseen object can also be used to guide Reach and Grasp movements although the touch-response memory durations described are extremely brief (Karl et al. in Exp Brain Res 219:59–74, 2012a). The purpose of the present study was to determine whether repeated nonvisual reaching for a consistent object could calibrate Reach and Grasp movements in a way similar to those guided by vision. The nonvision group wore vision-occluding goggles and reached for fifty consecutive trials for a round donut ball placed on a pedestal. The control group performed the same task with vision. Frame-by-frame video analysis and linear kinematics revealed that nonvision participants consistently used an elevated Reach trajectory, in which the hand, rather than being directed toward the target in the horizontal plane, was first elevated above the target before being lowered to touch and locate it. First contact was established with the dorsal surface of the target, and thus, adjustments in contact locations were often required for purchase. Although nonvision participants initially used an open and extended hand during transport, with practice they began to scale digit aperture to object size with an accuracy and temporal relation similar to vision participants. The different ways in which the Reach and Grasp movements respond to nonvisual learning are discussed in relation to support for the dual channel theory of reaching and to the idea that the Reach and Grasp channels may be differentially dependent on online visual guidance.
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Acknowledgments
The authors would like to thank two anonymous reviewers for helpful comments on an earlier draft of this paper. This research was supported by the Natural Sciences and Engineering Research Council of Canada (JMK, IQW), Alberta Innovates-Health Solutions (JMK), and Canadian Institutes of Health Research (IQW).
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Karl, J.M., Schneider, L.R. & Whishaw, I.Q. Nonvisual learning of intrinsic object properties in a reaching task dissociates grasp from reach. Exp Brain Res 225, 465–477 (2013). https://doi.org/10.1007/s00221-012-3386-z
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DOI: https://doi.org/10.1007/s00221-012-3386-z