Hansen R M, Hamer R D, Fulton A B
Department of Ophthalmology, Children's Hospital, Boston, MA.
Vision Res. 1992 Feb;32(2):387-92. doi: 10.1016/0042-6989(92)90147-b.
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.
在暗适应状态下以及存在稳定背景（该背景使阈值比暗适应水平提高1个对数单位）的情况下，获得了10周大的人类婴儿和成年人的心理物理面积-强度函数。对于暗适应的婴儿，完全空间总和的平均直径（4.42度；标准差：1.67度）显著大于成年人（2.32度；标准差：0.09度）。背景将婴儿的平均临界直径降低到2.67度（标准差：0.64度），将成年人的平均临界直径降低到1.16度（标准差：0.08度）。空间概率总和对婴儿和成年人的阈值有类似影响，因此，似乎不能解释临界直径的发育性减小。相反，怀疑是感受野大小减小。
