Grossmann Jon K, Dobbins Allan C
Department of Biomedical Engineering and Vision Science Research Center, University of Alabama at Birmingham, Birmingham, AL 35294, USA.
Vision Res. 2003 Feb;43(4):359-69. doi: 10.1016/s0042-6989(02)00480-7.
Two coaxial, ambiguously rotating objects tend to be perceived as corotating. Such grouping could be the consequence of bottom-up, cooperative interactions between the stimuli, or the top-down selection of object properties consistent with a model of the objects or scene. However, we find that the coupling between an ambiguous and unambiguous object is sharply reduced, presenting a challenge for both explanations of grouping. We describe experiments that support the idea that top-down feedback is necessary to select and stabilize a perceptual interpretation for ambiguous figures. Reduced coupling between objects of differing ambiguity can be explained if the feedback is global and proportional to ambiguity.
两个同轴且旋转方向不明确的物体往往会被感知为同向旋转。这种分组可能是刺激之间自下而上的协同相互作用的结果，也可能是与物体或场景模型一致的物体属性自上而下选择的结果。然而，我们发现一个不明确物体和一个明确物体之间的耦合明显减弱，这对两种分组解释都提出了挑战。我们描述的实验支持这样一种观点，即自上而下的反馈对于选择和稳定对模糊图形的感知解释是必要的。如果反馈是全局性的且与模糊度成正比，那么不同模糊度物体之间耦合减弱的现象就可以得到解释。
