Individual and simultaneous tracking of a step input by the horizontal saccadic eye movement and manual control systems.

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Abstract
In Exp I, 6 18-32 yr old males performed a discrete tracking task under conditions of separate and simultaneous saccadic eye tracking and manual tracking. Both saccadic and motor latencies were dependent on direct probability, the rate of gain of information being significantly greater for the eye system. In neither case was the rate of gain affected by simultaneous performance. No significant increase in mean saccadic latency was observed during simultaneous performance, although a small increase was suggested by the results for the motor reaction times. Considered with data on error responses, results indicate substantial independence in information processing for the 2 systems. On the other hand, interdependence, most likely on the input side, was suggested by high correlations between the residual errors of the 2 systems. Exp II, using 4 21-26 yr old males, confirmed the dependence of saccadic latencies on direction information and further indicated that they were independent of extent uncertainty. (20 ref) (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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