Ellemberg D, Lewis T L, Defina N, Maurer D, Brent H P, Guillemot J-P, Lepore F
Département de Kinésiologie, Université de Montréal, Montréal, Qué., Canada.
Vision Res. 2005 Oct;45(22):2877-84. doi: 10.1016/j.visres.2004.11.019.
We compared sensitivity to first-order versus second-order local motion in patients treated for dense central congenital cataracts in one or both eyes. Amplitude modulation thresholds were measured for discriminating the direction of motion of luminance-modulated (first-order) and contrast modulated (second-order) horizontal sine-wave gratings. Early visual deprivation, whether monocular or binocular, caused losses in sensitivity to both first- and second-order motion, with greater losses for second-order motion than for first-order motion. These findings are consistent with the hypothesis that the two types of motion are processed by different mechanisms and suggest that those mechanisms are differentially sensitive to early visual input.
我们比较了单眼或双眼接受致密性中央先天性白内障治疗的患者对一阶与二阶局部运动的敏感度。测量了用于辨别亮度调制（一阶）和对比度调制（二阶）水平正弦波光栅运动方向的调幅阈值。早期视觉剥夺，无论是单眼还是双眼的，都会导致对一阶和二阶运动的敏感度下降，二阶运动的敏感度下降幅度大于一阶运动。这些发现与两种运动由不同机制处理的假设一致，并表明这些机制对早期视觉输入的敏感度不同。
