Sensitivity of Joint Rotation

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Abstract
It has been suggested many times that operators in industrial tasks opt for a certain position of a limb in the belief that the position allows exertion of maximum control. One factor affecting this chosen position may well be that the sensitivity of joint rotation is greater in one position than another. An experiment is described whereby limbs are moved passively (i.e. forearm and foot) in two different directions, from three different starting positions and at six different accelerations. The likely factor to which a subject responds from the alternatives-acceleration, velocity, degree of angular rotation-has boon sought. Results indicate that subjects respond to acceleration and that starting position and direction of movement have a distinct bearing On sensitivity.

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