Visual motion priming reveals why motion perception deteriorates during mesopic vision
Visual motion priming reveals why motion perception deteriorates during mesopic vision
复制标题
视觉运动启动揭示了中间视觉期间运动感知恶化的原因
作者：
Yoshimoto;S.;Takeuchi;T.
摘要：我们从经验上知道，在视杆细胞和视锥细胞同时工作的中间视觉下，对运动物体的知觉会恶化。这项研究的目的是检查这种退化的原因。我们利用了一种称为视觉运动启动的现象，在这种现象中，一个方向模糊的测试刺激的感知方向受到前一个刺激的移动方向的影响。启动刺激和测试刺激之间的空间距离是不同的。在中间视光水平，位于中央视网膜的刺激可能由视锥系统处理，而位于外围视网膜的刺激则由视杆系统处理(Raphael&MacLeod，2011)。受试者判断180个相移正弦波光栅的感知方向，然后在不同的视网膜照度下顺畅地漂移启动刺激。我们发现，在中间视觉条件下，当启动刺激和测试刺激分别出现在中央和外围时，运动启动的强度大大降低。相比之下，大多数试验在明视和暗视条件下，或者在中间视条件下，当启动和测试刺激都出现在中央视网膜时，都能感觉到运动启动。当启动刺激和测试刺激在时间上重叠时，无论视网膜照度如何，运动启动都是显著的。这些结果表明，视杆通路的时间延迟所导致的信号整合的不完全导致了中间视觉下运动知觉的退化。
Abstract:Abstract We know empirically that the perception of moving objects deteriorates under mesopic vision, in which both rods and cones operate. The purpose of this study was to examine the cause of this degradation. We utilized a phenomenon called visual motion priming, in which the perceived direction of a directionally ambiguous test stimulus is influenced by the moving direction of a preceding stimulus. The spatial distances between the priming and the test stimuli were varied. At mesopic light levels, a stimulus that is presented at the central retina is presumably processed by the cone system, while a stimulus that is presented at the peripheral retina is processed by the rod system (Raphael & MacLeod, 2011). Subjects judged the perceived direction of 180 phase-shifted sine-wave grating that was followed by a smoothly drifting priming stimulus under different retinal illuminances. We found that, under mesopic conditions, the strength of motion priming was greatly reduced when the priming and test stimuli were presented separately at the center and the periphery, respectively. In contrast, motion priming was perceived in most of the trials under photopic and scotopic conditions or when both the priming and test stimuli were presented at the central retina under mesopic conditions. When the priming and test stimuli temporally overlapped, motion priming was conspicuous irrespective of the retinal illuminance. These results suggest that the incompleteness in the integration of signals that was induced by the temporal delay of rod pathways caused the degradation of motion perception under mesopic vision.