Order Parameter Dynamics of Body-scaled Hysteresis and Mode Transitions in Grasping Behavior
Identifieur interne : 004203 ( Main/Merge ); précédent : 004202; suivant : 004204Order Parameter Dynamics of Body-scaled Hysteresis and Mode Transitions in Grasping Behavior
Auteurs : T. D. Frank [États-Unis] ; M. J. Richardson [États-Unis] ; Stacy M. Lopresti-Goodman [États-Unis] ; M. T. Turvey [États-Unis]Source :
- Journal of Biological Physics [ 0092-0606 ] ; 2009.
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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DOI: 10.1007/s10867-009-9133-4
PubMed: 19669557
PubMed Central: 2669118
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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. 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