Figure and ground in space and time: 2. Frequency, velocity, and perceptual organization.
Figure and ground in space and time: 2. Frequency, velocity, and perceptual organization.
复制标题
空间和时间上的图形和地面：2.频率、速度和感知组织。
作者：
Klymenko,V;Weisstein,N
一个模糊的二分图案的图形-背景组织，其中图案的两个区域包含空间频率不同的正弦波光栅，对于两对空间频率进行了检查：1和4个周期度-1，1和8个周期度-1。较高空间频率的区域以四种速率之一进行对比度反转：0、3.75、7.5或15 Hz。较低空间频率的区域在三组条件下与较高空间频率的光栅的时间频率或速度相等：一组静止条件，三组时间频率相等，三组速度相等。对于1和4个周期的deg− 1对，空间频率较低的区域往往被视为背景的时间百分比较高。有显着的线性趋势的外观作为背景的区域的空间频率较低的两个区域之间的速度差的大小的模式。1周期度-1光栅相对于4周期度-1光栅移动得越快，被视为地面的时间百分比就越高。1和8周期deg− 1对的结果在某些情况下是出乎意料的，因为8周期deg− 1光栅被视为1周期deg− 1光栅后面的地面，即使它具有较高的空间频率并且以较慢的速度移动。讨论了视觉系统的时空调谐。
The figure – ground organization of an ambiguous bipartite pattern in which the two regions of the pattern contained sine-wave gratings which differed in spatial frequency was examined for two pairs of spatial frequencies: 1 and 4 cycles deg−1, and 1 and 8 cycles deg−1. The region of higher spatial frequency underwent contrast reversal at one of four rates: 0, 3.75, 7.5, or 15 Hz. The region of lower spatial frequency was equated with either the temporal frequency or the velocity of the grating of higher spatial frequency in three sets of conditions: one stationary condition, three in which temporal frequency was equated, and three in which velocity was equated. For the 1 and 4 cycles deg−1pair, the region of lower spatial frequency tended to be seen as the background a higher percentage of the time. There were significant linear trends for the appearance as background of the region of lower spatial frequency with respect to the magnitude of the velocity difference between the two regions of the pattern. The faster the 1 cycle deg−1grating moved with respect to the 4 cycles deg−1grating, the higher the percentage of the time it was seen as the ground. The results for the 1 and 8 cycles deg−1pair were in some cases unexpected in that the 8 cycles deg−1grating was seen as the ground behind the 1 cycle deg−1grating even though it was of a higher spatial frequency and moved at a slower velocity. The spatiotemporal tuning of the visual system is discussed.