Order Parameter Dynamics of Body-scaled Hysteresis and Mode Transitions in Grasping Behavior |
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Authors: | T D Frank M J Richardson Stacy M Lopresti-Goodman M T Turvey |
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Institution: | (1) Center for the Ecological Study of Perception and Action, Department of Psychology, 406 Babbidge Road, Unit 1020, University of Connecticut, Storrs, CT 06269, USA;(2) Department of Psychology, Colby College, Mayflower Hill, Waterville, ME 04901, USA;(3) Haskins Laboratories, New Haven, CT 06510, USA |
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Abstract: | Several experimental studies have shown that human grasping behavior exhibits a transition from one-handed to two-handed grasping
when to-be-grasped objects become larger and larger. The transition point depends on the relative size of objects measured
in terms of human body-scales. Most strikingly, the transitions between the two different behavioral ‘modes’ of grasping exhibit
hysteresis. That is, one-to-two hand transitions and two-to-one hand transitions occur at different relative object sizes
when objects are scaled up or down in size. In our study we approach body-scaled hysteresis and mode transitions in grasping
by exploiting the notion that human behavior in general results from self-organization and satisfies appropriately-defined
order parameter equations. To this end, grasping transitions and grasping hysteresis are discussed from a theoretical perspective
in analogy to cognitive processes defined by Haken’s neural network model for pattern recognition. In doing so, issues such
as the exclusivity of grasping modes, biomechanical constraints, mode-mode interactions, single subject behavior and population
behavior are explored. |
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Keywords: | Order parameters Hysteresis Grasping |
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