MONOCULARLY DEPRIVED HUMANS - NON-DEPRIVED EYE HAS SUPERNORMAL VERNIER ACUITY
MONOCULARLY DEPRIVED HUMANS - NON-DEPRIVED EYE HAS SUPERNORMAL VERNIER ACUITY
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DOI：
10.1152/jn.1980.43.6.1645
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发表时间：
1980-01-01
影响因子：
2.5
通讯作者：
BRADLEY, A
中科院分区：
文献类型：
--
作者：
FREEMAN, RD;BRADLEY, A
对动物单眼剥夺的研究表明，眼睛的功能性分离不仅仅是一个萎缩的过程。在两组人中，通过测试高度敏感的视觉功能游标敏锐度，寻找了一种活跃的神经过程，从而使功能眼可以获得额外的通路。其中一组人实际上是在童年时期被剥夺了单眼视力。第二组与第一组匹配，只是在功能上是双眼的。使用灵敏的心理物理技术，发现功能性单眼受试者的游标敏锐度显著高于单眼受试者的双眼组。一些功能性单眼受试者为屈光参差性弱视，其中1只眼视力下降。对于这些人，他们的游标敏锐度缺陷与通过测量不同空间频率的正弦光栅的对比敏感度而发现的视力缺陷进行了比较。估计的截止频率表明，游标功能比光栅分辨率受到的损害相对更大。单眼剥夺受试者单眼视觉功能的某一方面高于正常水平。单眼剥夺可能导致了活跃的神经招募，但也有可能有其他解释。
The studies of monocular deprivation in animals suggest that functional disconnection of an eye is not simply a process of atrophy. An active neural process whereby additional pathways become available to the functional eye was sought by testing a highly sensitive visual function, vernier acuity, in 2 groups of humans. One group consisted of individuals who had been effectively monocularly deprived during childhood. The 2nd group was matched to the 1st except that they were functionally binocular. Using a sensitive psychophysical technique, it was found that the functionally monocular subjects had significantly higher vernier acuities than those of the binocular group who were tested monocularly. Some of the functionally monocular subjects were anisometropic amblyopes with reduced visual capacity in 1 eye. For these individuals, comparisons were made between their vernier acuity deficits and those found by measurements of contrast sensitivities for sinusoidal gratings of varying spatial frequencies. Estimated cutoff frequencies suggest that vernier function is relatively more impaired than grating resolution. An aspect of monocular visual function is higher than normal in monocularly deprived subjects. An active neural recruitment may have occurred as a result of the monocular deprivation, but alternative explanations are possible.