Guiding contact by coupling the taus of gaps.

Guiding contact by coupling the taus of gaps. Research Abstract Details 

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Guiding contact by coupling the taus of gaps. Abstract Text:

D N Lee,A P Georgopoulos,M J Clark,C M Craig,N L Port,

Animals control contact with surfaces when locomoting, catching prey, etc. This requires sensorily guiding the rate of closure of gaps between effectors such as the hands, feet or jaws and destinations such as a ball, the ground and a prey. Control is generally rapid, reliable and robust, even with small nervous systems: the sensorimotor processes are therefore probably rather simple. We tested a hypothesis, based on general tau theory, that closing two gaps simultaneously, as required in many actions, might be achieved simply by keeping the taus of the gaps coupled in constant ratio. tau of a changing gap is defined as the time-to-closure of the gap at the current closure-rate. General tau theory shows that tau of a gap could, in principle, be directly sensed without needing to sense either the gap size or its rate of closure. In our experiment, subjects moved an effector (computer cursor) to a destination zone indicated on the computer monitor, to stop in the zone just as a moving target cursor reached it. The results indicated the subjects achieved the task by keeping tau of the gap between effector and target coupled to tau of the gap between the effector and the destination zone. Evidence of tau-coupling has also been found, for example, in bats guiding landing using echolocation. Thus, it appears that a sensorimotor process used by different species for coordinating the closure of two or more gaps between effectors and destinations entails constantly sensing the taus of the gaps and moving so as to keep the taus coupled in constant ratio.

Guiding contact by coupling the taus of gaps. Publishing Authors By Initials

DN Lee,AP Georgopoulos,MJ Clark,CM Craig,NL Port,

For similar natural sciences: time: time factors research abstracts see: natural sciences: time: time factors research

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Guiding contact by coupling the taus of gaps. Journal Published:

PUBLICATION TYPE: Research Support, U.S. Gov't,

Journal: Experimental brain research. Experimentelle Hirnfo

VOLUME: 139

Page Numbers: 151-9

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ISSN: 0014-4819

DAY: 15

MONTH: Jul

YEAR: 2001

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LANGUAGE: eng

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Guiding contact by coupling the taus of gaps. Keywords Mesh Terms:

KEYWORDS: Time Factors

MESH TERMS: physiology

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Grant and Affiliation Information for Guiding contact by coupling the taus of gaps.

AFFILIATION: Department of Psychology, University of Edinburgh, Scotland. d.n.lee@ed.ac.uk

Country: Germany

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MEDLINETA: Exp Brain Res

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