Development of sensitivity to visual motion in macaque monkeys
Development of sensitivity to visual motion in macaque monkeys
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DOI：
10.1017/s0952523804216054
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发表时间：
2004-11-01
影响因子：
1.9
通讯作者：
Movshon, JA
中科院分区：
文献类型：
--
作者：
Kiorpes, L;Movshon, JA
空间视觉的发展在人类和非人类灵长类动物中相对有据可查。然而，对运动敏感性的发展知之甚少。我们测量了对运动方向的敏感性的发展。以及猕猴的运动和对比敏感度之间的关系作为年龄的函数。猴子（Macaca nemestrina，年龄在10天到3岁之间）在随机点运动图中辨别运动方向。最年轻的猴子表现出方向选择性定向和整合运动信号的能力，在大点位移和快速。随着年龄的增长，相干灵敏度提高所有的空间和时间点位移测试。在确定动物除最小年龄外的所有表现方面，凝块之间的时间间隔远不如空间偏移重要。运动敏感度的改善远远超过了出生后的第一年结束。当中空间频率对比敏感度达到渐近线时，并持续至少3年。在第一年结束后，对高空间频率对比度的敏感性也继续发展。我们的结论是，运动灵敏度的发展取决于机制超出了低级别的过滤器假定限制敏锐度和对比敏感度。并且很可能反映了纹外视觉区的功能。
The development of spatial vision is relatively well documented in human and nonhuman primates. However, little is known about the development of sensitivity to motion. We measured the development, of sensitivity to direction of motion. and the relationship between motion and contrast sensitivity in macaque monkeys as a function of age. Monkeys (Macaca nemestrina, aged between 10 days and 3 years) discriminated direction of motion in random-dot kinematograms. The youngest monkeys showed directionally selective orienting and the ability to integrate motion signals at large dot displacements and fast speeds. With age, coherence sensitivity improved for all spatial and temporal dot displacements tested. The temporal interval between the clots was far less important than the spatial offset in determining the animals' performance at all but the ,est ages. Motion sensitivity improved well beyond the end of the first postnatal year. when mid-spatial-frequency contrast sensitivity reached asymptote, and continued for at least 3 years. Sensitivity to contrast at high spatial frequencies also continued to develop beyond the end of the first year. We conclude that the development of motion sensitivity depends on mechanisms beyond the low-level filters presumed to limit acuity and contrast sensitivity. and most likely reflects the function of extrastriate visual areas.