''Virtual vertigo''
''This Thesis was aimed at studying the effects of time delay
in the visual feedback loop of a man-machine system. A
one-dimensional, step-type input, pursuit tracking experiment
was developed to study these effects with transmission-type
delays of zero to ten seconds. Thirty-six subjects participated
in a series of tests that covered: seven different delays,
two different levels of course complexity for each delay,
learning, and open-loop conditions. It was found that tracking
performance deteriorates non-linearly with increases in delay
and that the magnitude of this performance degradation is a
function of course complexity.''
Effects of time delay in the visual feedback loop of a human-machine system (1966)
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