Bower Jeffrey D, Bian Zheng, Andersen George J
Department of Psychology, University of California Riverside, Riverside, CA 92521, USA.
Atten Percept Psychophys. 2012 Jul;74(5):942-9. doi: 10.3758/s13414-012-0283-2.
The present study assessed direction discrimination with moving random-dot cinematograms at retinal eccentricities of 0, 8, 22, and 40 deg. In addition, Landolt-C acuity was assessed at these eccentricities to determine whether changes in motion discrimination performance covaried with acuity in the retinal periphery. The results of the experiment indicated that discrimination thresholds increased with retinal eccentricity and directional variance (noise), independent of acuity. Psychophysical modeling indicated that the results for eccentricity and noise could be explained by an increase in channel bandwidth and an increase in internal multiplicative noise.
本研究使用移动随机点电影片在视网膜偏心度为0、8、22和40度时评估方向辨别能力。此外，还在这些偏心度下评估了Landolt-C视力，以确定运动辨别性能的变化是否与视网膜周边的视力相关。实验结果表明，辨别阈值随视网膜偏心度和方向方差（噪声）增加，与视力无关。心理物理学建模表明，偏心度和噪声的结果可以通过通道带宽增加和内部乘法噪声增加来解释。
