Visual control of braking in goal-directed action and sport
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CONTRIBUTORS:
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JOURNAL:
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YEAR:
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1997
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PUB TYPE:
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Journal Article
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SUBJECT(S):
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SPORT; SKILL; JUDGEMENT; VISION; ACCELERATION; BRAKING; COLLISION; ELITE-ATHLETE; PERCEPTION
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DISCIPLINE:
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No discipline assigned
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HTTP:
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LANGUAGE:
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English
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PUB ID:
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103-366-535
(Last edited on
2002/02/27 18:45:00 US/Mountain)
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SPONSOR(S):
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ABSTRACT:
Reaching a moving object, avoiding an obstacle, or controlling a rotation are common requirements of experts in sport and goal-directed action. Since the original analysis of optic flow, a large number of studies have addressed the problem of perception and control of braking. In this paper, the perception-action strategies described for deceleration control are reviewed; driving, docking, landing, somersaulting, running and reaching are analysed. The role played by "tau dot", the first temporal derivative of tau, is shown to be critical. However, the so-called constant tau-dot strategy proposed to explain how we regulate our deceleration in such circumstances is critically examined and rejected. New directions in the problem of braking control are proposed that emphasize: (1) the advantage of tau-dot over other kinematic variables; (2) the task specificity of tau-dot; (3) the need to consider tau-dot as a control variable; and (4) the role played by the controller dynamics in the perception-action loop. Several directions for future research are suggested.
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