Department of Psychology, Ben Gurion University of the Negev, Israel.
Dev Sci. 2011 Nov;14(6):1330-9. doi: 10.1111/j.1467-7687.2011.01078.x. Epub 2011 Sep 9.
We used a staircase procedure to test sensitivity to (1) global motion in random-dot kinematograms moving at 4° and 18° s(-1) and (2) biological motion. Thresholds were defined as (1) the minimum percentage of signal dots (i.e. the maximum percentage of noise dots) necessary for accurate discrimination of upward versus downward motion or (2) the maximum percentage of noise dots tolerated for accurate discrimination of biological from non-biological motion. Subjects were adults and children aged 6-8, 9-11, and 12-14 years (n = 20 per group). Contrary to earlier research, results revealed a similar, long developmental trajectory for sensitivity to global motion at both slower and faster speeds and for biological motion. Thresholds for all three tasks improved monotonically between 6 and 14 years of age, at which point they were adult-like. The results suggest that the extrastriate mechanisms that integrate local motion cues over time and space take many years to mature.
我们使用阶梯程序来测试对（1）以 4°和 18° s(-1)速度运动的随机点运动中的全局运动，以及（2）生物运动的敏感性。阈值被定义为（1）用于准确区分向上和向下运动所需的信号点的最小百分比（即噪声点的最大百分比），或（2）用于准确区分生物与非生物运动所需的噪声点的最大百分比。受试者为年龄在 6-8、9-11 和 12-14 岁的成年人和儿童（每组 20 人）。与早期研究相反，结果表明，对较慢和较快速度的全局运动以及对生物运动的敏感性具有相似的、长期的发展轨迹。所有三个任务的阈值在 6 至 14 岁之间呈单调递增，此时与成人相似。结果表明，将局部运动线索在时间和空间上整合的纹外机制需要多年时间才能成熟。
