Time to contact and the control of manual prehension

Experimental Brain Research
M K Watson, L S Jakobson

Abstract

In the present study, a kinematic analysis was made of unconstrained, natural prehension movements directed toward an object approaching the observer on a conveyor belt at one of three constant velocities, from one of three different directions (head-on or along the fronto-parallel plane coming either from the subject's left or right). Subjects were required to grasp the object when it reached a target located 20 cm directly in front of the hand's start position. The kinematic analysis revealed that both the transport and grasp components of the movement changed in response to the experimental manipulations, but did so in a manner that guaranteed that, for objects approaching from a given direction, hand closure would begin at a constant time prior to object contact (regardless of the object's approach speed). The kinematic analysis also revealed, however, that the onset of hand closure began earlier with objects approaching from the right than from other directions -- an effect which would not be predicted if time to contact was the key variable controlling the onset of hand closure. These results, then, lend only partial support to the theory that temporal coordination between the transport and grasp components of prehension ...Continue Reading

Citations

Mar 28, 2006·Experimental Brain Research·Miya K RandGeorge E Stelmach
Apr 29, 2008·Experimental Brain Research·Miya K RandGeorge E Stelmach
Oct 20, 2006·Gait & Posture·Michael E Cinelli, Aftab E Patla
Jul 27, 2001·Current Biology : CB·M Mon-Williams, J R Tresilian
Nov 1, 2018·Journal of Neurophysiology·Eli Brenner, Jeroen B J Smeets
Nov 4, 2009·Augmentative and Alternative Communication : AAC·Helen I Cannella-MaloneJeff Sigafoos
Feb 10, 2012·Journal of Sports Sciences·Toshiyuki Fujihara, Pierre Gervais
Feb 9, 2012·Journal of Sports Sciences·Toshiyuki Fujihara, Pierre Gervais

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