Casco C
Dipartimento di Psicologia Generale, Università di Padova, Italy.
Perception. 1990;19(4):437-45. doi: 10.1068/p190437.
Observers viewed two alternating frames, each consisting of three rectangular bars displaced laterally by one cycle in one frame with respect to the other. At long interframe intervals (IFIs) observers perceived a group of three bars moving as a whole (group motion), and at short IFIs the overlapping elements in the two frames appeared stationary, while the third element appeared to move from one end of the display to the other (element motion). The upper temporal limit for perceiving element motion was reduced when bars with blurred edges were used and when either frame duration or bar size was increased. However, when inner and outer elements had different sizes, the element motion percept was dominant up to 230 ms IFI. These findings may be interpreted in terms of spatial tuning of motion mechanisms involved in the perception of bistable apparent motion.
观察者观看了两个交替出现的画面，每个画面由三根矩形条组成，其中一个画面中的三根条相对于另一个画面横向偏移了一个周期。在较长的帧间间隔（IFI）时，观察者会将三根条看作一个整体移动（群组运动），而在较短的IFI时，两个画面中重叠的部分看起来是静止的，而第三根条则似乎从显示屏的一端移动到另一端（元素运动）。当使用边缘模糊的条、增加帧持续时间或条的大小时，感知元素运动的时间上限会降低。然而，当内部和外部元素大小不同时，在IFI达到230毫秒之前，元素运动感知占主导地位。这些发现可以根据参与双稳态似动感知的运动机制的空间调谐来解释。
