Inhibition of vection by grasping an object
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The present study investigated whether vection could be modified by an object grasping movement. Twenty-five university students were asked to do one of the following four types of left-hand movements while they were viewing a radial optic flow: (1) grasping the hand-gripper strongly; (2) holding the hand-gripper; (3) clenching fist strongly; and (4) open hand without having anything in their left hands (normal hand condition). The participants’ tasks were to keep pressing a button with their right hands while they were perceiving vection. After each trial, they estimated the subjective strength of vection on a 101-point scale. The result showed that the vection was inhibited by strongly grasping the hand-gripper task more than by the other hand movements. Vection could be weakened by the object grasping movement. It might be suggested that vection could be inhibited by the presence of an object being grasped and also by the grasping movement itself. We speculated that the mechanism underlying this inhibition might be related to cognitive pressure, attentional load, power and muscle tonus, and multisensory and proprioception interactions.
KeywordsVection Self-motion perception Grasping movement Inhibition Hand-gripper Optic flow
We thank Elizabeth Dawes, PhD, from Edanz Group (http://www.edanzediting.com/ac) for editing a draft of this manuscript. This work was supported by JSPS KAKENHI Grant-in-Aid for JSPS Fellows (Grant Number 16J06224) to MM and for Young Scientists (B) (Grant Numbers 17K12869 and 18H01100) to TS from Ministry of Education, Culture, Sports, Science and Technology of Japan. Part of this work was carried out under the Cooperative Research Project Program of the Research Institute of Electrical Communication, Tohoku University.
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