There is a perceptual distortion of the speed of optic flow in VR which may have implications for the ecological validity of treadmill-mediated virtual environments. This study investigated the extent of the perceptual distortion, and the upper and lower boundaries of perceived normal gain when the rate of optic flow is manipulated. There was a range of gain which was perceived as normal (1.55 - 2.41), and even the minimum perceived normal gain was significantly higher than the true normal gain of 1:1 (t(19) = 7.51, p
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