Long trajectory for the development of sensitivity to global and biological motion
Long trajectory for the development of sensitivity to global and biological motion
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DOI：
10.1111/j.1467-7687.2011.01078.x
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发表时间：
2011-11-01
影响因子：
3.7
通讯作者：
Lewis, Terri L.
中科院分区：
文献类型：
--
作者：
Hadad, Bat-Sheva;Maurer, Daphne;Lewis, Terri L.
我们使用阶梯程序来测试对（1）以4度和18度s-1移动的随机点运动图中的全局运动和（2）生物运动的敏感性。临界点被定义为（1）准确区分向上运动与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）准确区分生物运动与非生物运动所容许的噪声点的最大百分比。受试者为68岁、911岁和1214岁的成人和儿童（每组n = 20）。与早期的研究相反，结果显示了一个类似的，长期的发展轨迹，对全球运动的敏感性，在较慢和较快的速度和生物运动。所有三项任务的能力在6至14岁之间单调提高，此时他们就像成年人一样。结果表明，整合局部运动线索的纹状体外机制需要多年的时间和空间才能成熟。
We used a staircase procedure to test sensitivity to (1) global motion in random-dot kinematograms moving at 4 degrees and 18 degrees 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 68, 911, and 1214 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.