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Haptically creating affordances: the user-tool interface.

Jeffrey B Wagman·Claudia Carello
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Abstract

Successful use of a hand-held tool requires overcoming the rotational inertia of the hand-plus-tool system. Where an object is grasped affects this rotational inertia. Appropriate choice of grip position may be crucial in the safe, effective, and efficient control of a hand-held tool. In 3 experiments, the authors investigated how choice of grip position on a tool was constrained by task demands. The results suggest that choice of grasp position serves to establish relationships among 3 variables derived from the inertial ellipsoid of the hand-object system (volume, symmetry, and eigenvector angle) in a way that specifically reflected the power or precision constraints of the given task. These variables have previously been shown to play a role in haptic perception of tool function. Changing grasp position on a tool is a way to exert control over the nuances of the user-tool interface.

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Choice BehaviorEnvironmentFixation, OcularHand StrengthHumansRotationUser-Computer InterfaceVisual PerceptionJournal ArticleResearch Support, U.S. Gov't, Non-P.H.S.

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Jeffrey B Wagman, Claudia Carello. 2003. Haptically creating affordances: the user-tool interface.. https://doi.org/10.1037/1076-898x.9.3.175

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