Tcheang Lili, Gilson Stuart J, Glennerster Andrew
University Laboratory of Physiology, Oxford University, UK.
Vision Res. 2005 Jul;45(16):2177-89. doi: 10.1016/j.visres.2005.02.006.
Using an immersive virtual reality system, we measured the ability of observers to detect the rotation of an object when its movement was yoked to the observer's own translation. Most subjects had a large bias such that a static object appeared to rotate away from them as they moved. Thresholds for detecting target rotation were similar to those for an equivalent speed discrimination task carried out by static observers, suggesting that visual discrimination is the predominant limiting factor in detecting target rotation. Adding a stable visual reference frame almost eliminated the bias. Varying the viewing distance of the target had little effect, consistent with observers underestimating distance walked. However, accuracy of walking to a briefly presented visual target was high and not consistent with an underestimation of distance walked. We discuss implications for theories of a task-independent representation of visual space.
使用沉浸式虚拟现实系统，我们测量了观察者在物体运动与自身平移相关联时检测物体旋转的能力。大多数受试者存在较大偏差，即当他们移动时，静止物体似乎会远离他们旋转。检测目标旋转的阈值与静态观察者执行的等效速度辨别任务的阈值相似，这表明视觉辨别是检测目标旋转的主要限制因素。添加稳定的视觉参考框架几乎消除了偏差。改变目标的观察距离影响不大，这与观察者低估行走距离一致。然而，朝着短暂呈现的视觉目标行走的准确性很高，与低估行走距离不一致。我们讨论了对视觉空间任务独立表征理论的影响。
