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Braking reaching movements : a test of the constant tau-dot strategy under different viewing conditions.

Hopkins, Brian and Churchill, Andrew and Vogt, Stefan and Rönnqvist, Louise (2004) Braking reaching movements : a test of the constant tau-dot strategy under different viewing conditions. Journal of Motor Behavior, 36 (1). pp. 3-12.

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Following F. Zaal and R. J. Bootsma (1995), the authors studied whether the decelerative phase of a reaching movement could he modeled as a constant tau-dot strategy resulting in a soft collision with the object. Specifically. they investigated whether that strategy is sustained over different viewing conditions. Participants (N =11 ) were required to reach for 15- and 50-mm objects at 2 different distances under 3 conditions in which visual availability of the immediate environment and of the reaching hand were varied. Tau-dot estimates and goodness-of-fit were highly similar across the 3 conditions. Only within-participant variability of tau-dot estimates was increased when environmental cues were removed. That finding suggests that the motor system uses a tau-dot strategy involving the intermodal (i.e., visual. pro-prioceptive. or both) specification of information to regulate the decelerative phase of reaching under restricted viewing conditions. The authors provide recommendations for improving the derivation of t<sub>x</sub> estimates and stress the need for further research on how time-to-contact information is used in the regulation of the dynamics of actions such as reaching.

Item Type: Article
Journal or Publication Title: Journal of Motor Behavior
Uncontrolled Keywords: decelerative phase environmental structure low-velocity phase tau visual feedback
Subjects: B Philosophy. Psychology. Religion > BF Psychology
Departments: Faculty of Science and Technology > Psychology
ID Code: 10022
Deposited By: Mrs Karen Gerrard
Deposited On: 25 Jun 2008 15:29
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 14:42
Identification Number:

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