Ritter A D, Breitmeyer B G
University of Houston, Department of Psychology, TX 77004.
Vision Res. 1989;29(9):1215-9. doi: 10.1016/0042-6989(89)90067-9.
Two competitive percepts are produced from a bistable stroboscopic motion display. In this display two frames, each containing three horizontally arrayed elements are presented alternately for several cycles. At short interstimulus intervals (ISIs) element or end-to-end motion responses are obtained when the two inner, spatially overlapping elements are seen as stationary and the third element moves back and forth from one end to the other end. Group motion responses are obtained at longer ISIs when the three elements are seen to move back and forth as a group. The dominance of these two percepts across ISIs was controlled by the manipulation of (1) element size, (2) frame duration, and (3) viewing conditions. Under both binocular and dichoptic viewing, element motion responses increase as element size and frame duration decrease. By maximizing pattern persistence substantial element motion responses were obtained dichoptically as well as binocularly. Instead of supporting the existence of two separate, low-level and high-level, motion systems, our data suggest that there is a single, high-level mechanism for motion whose output can be modulated by pattern persistence.
双稳态频闪运动显示会产生两种相互竞争的感知。在这种显示中，两个帧，每个帧包含三个水平排列的元素，交替呈现几个周期。在短刺激间隔（ISI）下，当两个内部空间重叠的元素被视为静止，而第三个元素从一端到另一端来回移动时，会获得元素或端到端的运动反应。在较长的ISI下，当三个元素被视为作为一个组来回移动时，会获得群组运动反应。这两种感知在ISI上的优势通过对以下因素的操纵来控制：（1）元素大小，（2）帧持续时间，以及（3）观察条件。在双眼和单眼观察下，元素运动反应都会随着元素大小和帧持续时间的减小而增加。通过最大化模式持久性，在单眼和双眼观察下都获得了显著的元素运动反应。我们的数据并未支持存在两个独立的、低级和高级的运动系统，而是表明存在一个单一的高级运动机制，其输出可以通过模式持久性进行调制。
