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A Finite-State Description of Coordination in a Two-Handed Target Acquisition Task

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4 Author(s)

A position control stick with one hand and a velocity control stick with the other hand were manipulated in order to capture a moving target displayed on an oscilloscope screen. The two control sticks were additively coupled. In order to understand the coordination of the two control sticks, event-based first-order Markov "activity sequence generators" were constructed for individual subjects. These discrete probabilistic structures are closely related to each subject's overall plan or general strategy for the capture task. Striking individual differences and strategic errors in performance were revealed. When combined with additional time-conditioned (open-loop) and error-conditioned (closed-loop) details, the activity sequence generators provide a basis for a hierarchic description of this perceptual-motor skill.

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IEEE Transactions on Systems, Man, and Cybernetics  (Volume:12 ,  Issue: 4 )