Abstract
The requirement for a credible monkey-man extrapolation in the area of manual control systems led to the investigation of the predictor-operator phenomenon in rhesus monkeys performing in a manual control system. Two monkeys were trained to proficiency in a single-axis visual compensatory manual control system using a random (unpredictable) system input. Data were obtained for system performance in the random case. The system input was then changed to pure sinusoidal (predictable). Data were obtained for the sinusoidal case and compared with data for the random case. Unlike humans, monkeys were not able to improve system performance in the predictable versus unpredictable case.

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