It has been shown that latency from a virtual reality (VR) user's motion to the display output leads to VR sickness, and in turn decreases the task performance. However, the effects of small delays under 13 ms have not been investigated as the VR systems have not been able to achieve these small latency values. The purpose of this study is to reveal the effects of small latencies on head mounted display users. The subjects in this study were asked to simply and stably stand on a force plate with one foot. The speed of body sway was measured with several lags, from 1 ms to 66 ms, using an Oculus Rift DK2. The results showed that the sway speed increased monotonically with increase in the latency values. The sense of balance is regarded as a relatively direct index of quality of a VR system, including the effects of lag.
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