An experimental study has been made to determine the effect on pilot performance of time delays in the visual and motion feedback loops of a simulated pursuit track¬ing task. Three major interrelated factors were identified:task difficulty either in the form of airplane handling qualities or target frequency, the amount and type of motion cues, and time delay itself. In general, the greater the task difficulty, the smaller the time delay that could exist without degrading pilot performance. Conversely, the greater the motion fidelity, the greater the time delay that could be tolerated. The effect of motion was, however, pilot dependent.
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