Raghuram Aparna, Lakshminarayanan Vasudevan, Khanna Ritu
College of Optometry, University of Missouri-St Louis, Missouri 63121, USA.
J Opt Soc Am A Opt Image Sci Vis. 2005 Oct;22(10):2269-80. doi: 10.1364/josaa.22.002269.
We studied the effects of aging on a speed discrimination task using a pair of first-order drifting luminance gratings. Two reference speeds of 2 and 8 deg/s were presented at stimulus durations of 500 ms and 1000 ms. The choice of stimulus parameters, etc., was determined in preliminary experiments and described in Part I. Thresholds were estimated using a two-alternative-forced-choice staircase methodology. Data were collected from 16 younger subjects (mean age 24 years) and 17 older subjects (mean age 71 years). Results showed that thresholds for speed discrimination were higher for the older age group. This was especially true at stimulus duration of 500 ms for both slower and faster speeds. This could be attributed to differences in temporal integration of speed with age. Visual acuity and contrast sensitivity were not statistically observed to mediate age differences in the speed discrimination thresholds. Gender differences were observed in the older age group, with older women having higher thresholds.
我们使用一对一阶漂移亮度光栅研究了衰老对速度辨别任务的影响。在500毫秒和1000毫秒的刺激持续时间下，呈现了2度/秒和8度/秒这两个参考速度。刺激参数等的选择是在初步实验中确定的，并在第一部分中进行了描述。使用二选一强制选择阶梯法估计阈值。从16名年轻受试者（平均年龄24岁）和17名年长受试者（平均年龄71岁）收集数据。结果表明，老年组的速度辨别阈值更高。对于较慢和较快的速度，在500毫秒的刺激持续时间下尤其如此。这可能归因于速度的时间整合随年龄的差异。在速度辨别阈值的年龄差异中，未观察到视力和对比敏感度具有统计学上的中介作用。在老年组中观察到了性别差异，老年女性的阈值更高。
