Gori Simone, Giora Enrico, Pedersini Riccardo
Department of Psychology, University of Trieste, Via Sant' Anastasio 12, 34134 Trieste, TS, Italy.
Acta Psychol (Amst). 2008 Nov;129(3):399-409. doi: 10.1016/j.actpsy.2008.09.004. Epub 2008 Oct 16.
In a series of experiments using ambiguous stimuli, we investigate the effects of displaying ordered, discrete series of images on the dynamics of figure-ground segregation. For low frame presentation speeds, the series were perceived as a sequence of discontinuous, static images, while for high speeds they were perceived as continuous. We conclude that using stimuli varying continuously along one parameter results in stronger hysteresis and reduces spontaneous switching compared to matched static stimuli with discontinuous parameter changes. The additional evidence that the size of the hysteresis effects depended on trial duration is consistent with the stochastic nature of the dynamics governing figure-ground segregation. The results showed that for continuously changing stimuli, alternative figure-ground organizations are resolved via low-level, dynamical competition. A second series of experiments confirmed these results with an ambiguous stimulus based on Petter's effect.
在一系列使用模糊刺激的实验中，我们研究了展示有序、离散图像序列对图形-背景分离动力学的影响。对于低帧率呈现速度，这些序列被视为一系列不连续的静态图像，而对于高速度，它们被视为连续的。我们得出结论，与具有不连续参数变化的匹配静态刺激相比，使用沿一个参数连续变化的刺激会导致更强的滞后现象，并减少自发切换。滞后效应大小取决于试验持续时间的额外证据与控制图形-背景分离的动力学的随机性质一致。结果表明，对于连续变化的刺激，通过低水平的动态竞争来解决交替的图形-背景组织。第二系列实验用基于佩特效应的模糊刺激证实了这些结果。
