Title: Evaluation of the effects of frame time variation on VR task performance Show Chinese title

Title: 帧时间变化对VR任务性能的影响评估

Abstract: We present a first study of the effects of frame time variations, in both deviation around mean frame times and period of fluctuation, on task performance in a virtual environment (VE). Chosen are open and closed loop tasks that are typical for current applications or likely to be prominent in future ones. The results show that at frame times in the range deemed acceptable for many applications, fairly large deviations in amplitude over a fairly wide range of periods do not significantly affect task performance. However, at a frame time often considered a minimum for immersive VR, frame time variations do produce significant effects on closed loop task performance. The results will be of use to designers of VEs and immersive applications, who often must control frame time variations due to large fluctuations of complexity (graphical and otherwise) in the VE. Show Chinese abstract

Abstract: 我们首次研究了帧时间变化对虚拟环境（VE）中任务性能的影响，包括围绕平均帧时间的偏差和波动周期。选择的是开放环和闭环任务，这些任务是当前应用中的典型任务或未来可能突出的任务。结果表明，在被认为对许多应用可接受的帧时间范围内，幅度较大的偏差在较宽的周期范围内并不会显著影响任务性能。然而，在通常被认为是沉浸式VR最低帧时间的情况下，帧时间的变化确实会对闭环任务性能产生显著影响。这些结果将对VE和沉浸式应用的设计者有用，他们通常必须控制帧时间的变化，因为VE中的复杂性（图形或其他方面）可能会出现大幅波动。