Bonds A B, Casagrande V A, Norton T T, DeBruyn E J
Department of Electrical Engineering, Vanderbilt University, Nashville, TN 37235.
Vision Res. 1987;27(6):845-57. doi: 10.1016/0042-6989(87)90001-0.
Visual resolution and contrast sensitivity were examined in anesthetized, paralyzed galagos using visual evoked potentials (VEPs) resulting from stimulation with phase-reversed sinewave gratings. Spatial frequency vs contrast response functions were band-pass with peak sensitivity at 0.2-0.4 c/deg and a high frequency cut-off between 1.6 and 3 c/deg. Peak contrast sensitivities (estimated from extrapolation of contrast response functions) varied across animals from 10 to 170. Variation of the stimulus modulation rate showed that best responses occurred at 1 Hz with an upper limit of 6-16 Hz. As in other primates, an oblique effect was seen in 6 of 8 animals. The contrast sensitivity function (CSF) determined from cortical VEPs agrees well with the CSFs of cells in the lateral geniculate nucleus, but peak sensitivity and spatial frequency are slightly lower than found for the behavioral CSF. Overall visual performance resembled closely that of another nocturnal species, the cat.
使用由相位反转正弦波光栅刺激产生的视觉诱发电位（VEP），对麻醉、麻痹的婴猴的视觉分辨率和对比敏感度进行了检测。空间频率与对比响应函数呈带通，峰值敏感度在0.2 - 0.4周/度，高频截止在1.6至3周/度之间。峰值对比敏感度（通过对比响应函数外推估计）在不同动物之间从10到170不等。刺激调制率的变化表明，最佳反应出现在1赫兹，上限为6 - 16赫兹。与其他灵长类动物一样，8只动物中有6只出现了倾斜效应。由皮层VEP确定的对比敏感度函数（CSF）与外侧膝状核中细胞的CSF非常吻合，但峰值敏感度和空间频率略低于行为CSF中的值。总体视觉表现与另一种夜行性物种猫非常相似。
