Development of Center-Surround Suppression in Infant Motion Processing
Development of Center-Surround Suppression in Infant Motion Processing
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DOI：
10.1016/j.cub.2019.07.044
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发表时间：
2019-09-23
期刊：
影响因子：
9.2
通讯作者：
Kanazawa, So
中科院分区：
文献类型：
--
作者：
Nakashima, Yusuke;Yamaguchi, Masami K.;Kanazawa, So
大的高对比度图案的运动方向比小的图案更难察觉[1]。这种违反直觉的知觉现象被认为反映了周围抑制，这是在视觉皮质中观察到的一种接受场特性[2-5]。在这里，我们证明了这种现象可以在人类婴儿身上观察到。7到8个月大的婴儿对小的运动刺激比对大的运动刺激表现出更高的敏感度。然而，6个月以下的婴儿表现出相反的结果；大刺激的运动敏感度更高。这些结果表明，经典感受野以外的抑制周围区域在第一年的下半年发展。此外，我们检查了婴儿的空间总和的大小，发现空间总和的面积在3到8个月龄时缩小。我们的发现表明，婴儿早期的运动总和区域很宽，没有周围抑制，而在出生1岁时，运动总和区域变窄并获得抑制周围区域，这可能反映了接受野结构的发育变化。
Motion direction of a large high-contrast pattern is more difficult to perceive than that of a small one [1]. This counterintuitive perceptual phenomenon is considered to reflect surround suppression, a receptive field property observed in the visual cortex [2-5]. Here, we demonstrate that this phenomenon can be observed in human infants. Infants at 7 to 8 months of age showed higher sensitivity for a small motion stimulus than for a large one. However, infants under 6 months showed the opposite result; motion sensitivity was higher for a large stimulus. These results suggest that suppressive surround regions beyond classical receptive fields develop in the second half of the first year. Moreover, we examined the size of spatial summation in infants and found that the spatial summation area shrinks from 3 to 8 months of age. Our findings suggest that the summation area for motion is broad with no surround suppression in early infancy and that it narrows and acquires suppressive surround regions in the first year of life, which might reflect the developmental changes in the receptive field structure.