THE EFFECT OF LIGHT ADAPTATION ON SCOTOPIC SPATIAL SUMMATION IN 10-WEEK-OLD INFANTS

被引：13

作者：

HANSEN, RM

HAMER, RD

FULTON, AB

机构：

[1] HARVARD UNIV,SCH MED,BOSTON,MA 02115

[2] SMITH KETTLEWELL INST VISUAL SCI,SAN FRANCISCO,CA 94115

来源：

VISION RESEARCH | 1992年 / 32卷 / 02期

关键词：

SPATIAL SUMMATION; SCOTOPIC SENSITIVITY; HUMAN INFANTS; DEVELOPMENT;

D O I：

10.1016/0042-6989(92)90147-B

中图分类号：

Q189 [神经科学];

学科分类号：

071006 ;

摘要：

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.

引用

页码：387 / 392

页数：6

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