Genova Bilyana, Bocheva Nadejda
Institute of Neurobiology.
Can J Exp Psychol. 2013 Sep;67(3):195-204. doi: 10.1037/a0031567. Epub 2013 Mar 25.
We examined the effect of speed magnitude and range on the sensitivity to global speed in two different age groups. Stimuli consisted of band-pass dots whose speeds were perturbed by time-correlated or -uncorrelated random noise. The observer discriminated which of two sequentially presented stimuli moved faster. We found that the Weber fractions significantly diminished with increasing the speed of standard. The older observers had higher discrimination thresholds in all experimental conditions. The noise level did not significantly affect sensitivity to global speed differences, except for older observers' performance at the highest noise level. The temporal noise correlation differently impaired the performance of the younger and the older observers. The results are discussed in relation to speed-coding mechanisms and age-related changes in motion perception.
我们研究了速度大小和范围对两个不同年龄组全局速度敏感性的影响。刺激由带通点组成，其速度受到时间相关或不相关随机噪声的干扰。观察者辨别两个相继呈现的刺激中哪一个移动得更快。我们发现，随着标准速度的增加，韦伯分数显著降低。在所有实验条件下，年长的观察者具有更高的辨别阈值。除了在最高噪声水平下年长观察者的表现外，噪声水平对全局速度差异的敏感性没有显著影响。时间噪声相关性对年轻和年长观察者的表现产生了不同程度的损害。我们结合速度编码机制和运动感知中与年龄相关的变化对结果进行了讨论。
