Elsevier

Human Movement Science

Volume 11, Issue 6, December 1992, Pages 691-715
Human Movement Science

The perceptual guidance of grasping a moving object

https://doi.org/10.1016/0167-9457(92)90037-CGet rights and content

Abstract

The purpose of this experiment was to examine the type of strategy subjects used in catching an object approaching on a non-intersection trajectory at different, but predictable, constant velocities. A small treadmill mounted on a table top supported a target dowel to be ‘caught’ by the subject's hand, which rested at the end of the treadmill. The treadmill produced six constant velocity approaches administered in blocks of trials in ascending order. The object and the subject's finger movements were kinematically examined using a three-dimensional motion analysis system. The results indicated that a type of perceptual-motor coupling between the value of the optical variable tau (τ) at initiation of the catching movement and the duration of the catching movement was being used, rather than a consistent τ strategy. In addition, a relatively constant ratio of the value of τ at initiation and τ at the start of the catching movement was observed across the six object velocities. These results show limitations in the use of a critical τ strategy, at least in this type of task. A functional relationship between the information in τ and how a movement is performed may allow for greater flexibility in the coordination of interceptive acts.

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      One complication is that these different measures have been defined along different dimensions. This means that we cannot quantitatively compare the outcome measures of the dynamic–tau model (van de Kamp et al., 2010; Zaal & Bootsma, 2004; Zaal et al., 1998) with the values of first-order time-to-contact that have been reported in the many studies on catching and prehension (Bennett, van der Kamp, Savelsbergh, & Davids, 1999; Caljouw, van der Kamp, & Savelsbergh, 2004; van de Kamp et al., 2010; Wallace, Stevenson, Weeks, & Kelso, 1992; Zaal & Bootsma, 2004; Zaal et al., 1998). To arrive at dependent measures that are defined along the same dimension for each dependent variable (i.e., model prediction), we computed temporal prediction errors (van de Kamp et al., 2010).

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    The authors would like to thank Babak Baharlo for his assistance in data analysis and to the two anonymous reviewers for their comments on an earlier version of the manuscript.

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