Benton Christopher P, O'Brien Justin M D, Curran W
Department of Experimental Psychology, University of Bristol, 12a Priory Road, Bristol BS8 1TU, UK.
Biol Lett. 2007 Jun 22;3(3):306-8. doi: 10.1098/rsbl.2007.0056.
Here, we describe a motion stimulus in which the quality of rotation is fractal. This makes its motion unavailable to the translation-based motion analysis known to underlie much of our motion perception. In contrast, normal rotation can be extracted through the aggregation of the outputs of translational mechanisms. Neural adaptation of these translation-based motion mechanisms is thought to drive the motion after-effect, a phenomenon in which prolonged viewing of motion in one direction leads to a percept of motion in the opposite direction. We measured the motion after-effects induced in static and moving stimuli by fractal rotation. The after-effects found were an order of magnitude smaller than those elicited by normal rotation. Our findings suggest that the analysis of fractal rotation involves different neural processes than those for standard translational motion. Given that the percept of motion elicited by fractal rotation is a clear example of motion derived from form analysis, we propose that the extraction of fractal rotation may reflect the operation of a general mechanism for inferring motion from changes in form.
在此，我们描述了一种旋转特性呈分形的运动刺激。这使得其运动无法通过基于平移的运动分析来识别，而这种分析是我们许多运动感知的基础。相比之下，正常旋转可通过平移机制输出的聚合来提取。基于平移的这些运动机制的神经适应性被认为会引发运动后效，即长时间观看一个方向的运动后会产生相反方向运动感知的现象。我们测量了分形旋转在静态和动态刺激中诱发的运动后效。所发现的后效比正常旋转引发的后效小一个数量级。我们的研究结果表明，分形旋转的分析涉及与标准平移运动不同的神经过程。鉴于分形旋转引发的运动感知是形式分析得出运动的一个明显例子，我们提出分形旋转的提取可能反映了从形式变化推断运动的一般机制的运作。
