THE EFFECT OF LIGHT ADAPTATION ON SCOTOPIC SPATIAL SUMMATION IN 10-WEEK-OLD INFANTS
THE EFFECT OF LIGHT ADAPTATION ON SCOTOPIC SPATIAL SUMMATION IN 10-WEEK-OLD INFANTS
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DOI：
10.1016/0042-6989(92)90147-b
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发表时间：
1992-02-01
期刊：
影响因子：
1.8
通讯作者：
FULTON, AB
中科院分区：
文献类型：
--
作者：
HANSEN, RM;HAMER, RD;FULTON, AB
10周龄的婴儿和成人的心理物理面积-强度函数是在暗适应状态下获得的，并且在一个稳定的本底存在的情况下，阈值比暗适应水平高出1个对数单位。对于黑暗适应的婴儿，完全空间总和的平均直径(4.42度；SD：1.67度)显著大于成人(2.32度；SD：0.09度)。背景将婴儿的平均临界直径降至2.67度(SD：0.64度)，成人的平均临界直径降至1.16度(SD：0.08度)。空间概率总和对婴儿和成人的阈值有相似的影响，因此，似乎不能解释临界直径的发育减少。相反，人们怀疑接受野的大小减少了。
Psychophysical area-intensity functions of individual 10-week-old human infants and adults were obtained in the dark adapted state, and in the presence of a steady background that elevated threshold 1 log unit above the dark adapted level. For dark adapted infants, the mean diameter for complete spatial summation (4.42-degrees; SD: 1.67-degrees) was significantly larger than that of adults (2.32-degrees; SD: 0.09-degrees). The background reduced the mean critical diameter to 2.67-degrees for infants (SD: 0.64-degrees) and to 1.16-degrees for adults (SD: 0.08-degrees). Spatial probability summation has similar effects on infant and adult thresholds, and, therefore, does not appear to account for the developmental decrease in critical diameters. Rather, decreases in receptive field size are suspected.