Samantha L Strong, Ayah I Al-Rababah, Leon N Davies
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引用次数: 0
摘要
对比度和模糊度的变化会影响速度感知,这就提出了一个问题:眼睛的自然变化(如白内障)是否会引起光散射,从而影响运动感知。本研究调查了类似于白内障眼球中存在的光散射是否会对速度知觉产生有害影响。实验 1:参与者(n = 14)使用随机点运动图完成速度分辨任务。计算两种参考速度(慢;快)和两个方向(平移;径向)的刚察觉到的差异。用滤光片诱导光散射,分为四个等级:基线、轻度、中度和重度。重复测量方差分析(ANOVA)发现,散射对径向运动速度分辨力有显著的主效应(慢速 F(3, 39) = 7.33,p < 0.01;快速 F(3, 39) = 4.80,p < 0.01)。中度(慢速 p = 0.021)和重度(慢速 p = 0.024;快速 p = 0.017)散射的辨别能力减弱。平移运动没有发现影响。实验 2:参与者(n = 14)完成了三种速度(慢速、中速、快速)的接触时间实验。光散射的诱导与实验 1 相同。结果显示,散射光增加会导致感知减慢。重复测量方差分析显示,中速(F(3, 39) = 3.57, p = 0.023)和快速(F(1.42, 18.48) = 5.63, p = 0.020)受到光散射增加的影响。总体而言,光散射的增加会减弱速度分辨能力,这似乎是由对刺激的感知减慢驱动的。
Increased light scatter in simulated cataracts degrades speed perception.
Changes in contrast and blur affect speed perception, raising the question of whether natural changes in the eye (e.g., cataract) that induce light scatter may affect motion perception. This study investigated whether light scatter, similar to that present in a cataractous eye, could have deleterious effects on speed perception. Experiment 1: Participants (n = 14) completed a speed discrimination task using random dot kinematograms. The just-noticeable difference was calculated for two reference speeds (slow; fast) and two directions (translational; radial). Light scatter was induced with filters across four levels: baseline, mild, moderate, severe. Repeated measures analyses of variance (ANOVAs) found significant main effects of scatter on speed discrimination for radial motion (slow F(3, 39) = 7.33, p < 0.01; fast F(3, 39) = 4.80, p < 0.01). Discrimination was attenuated for moderate (slow p = 0.021) and severe (slow p = 0.024; fast p = 0.017) scatter. No effect was found for translational motion. Experiment 2: Participants (n = 14) completed a time-to-contact experiment for three speeds (slow, moderate, fast). Light scatter was induced as Experiment 1. Results show increasing scatter led to perceptual slowing. Repeated measures ANOVAs revealed that moderate (F(3, 39) = 3.57, p = 0.023) and fast (F(1.42, 18.48) = 5.63, p = 0.020) speeds were affected by the increasing light scatter. Overall, speed discrimination is attenuated by increasing light scatter, which seems to be driven by a perceptual slowing of stimuli.
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