Langston A, Casagrande V A, Fox R
Vision Res. 1986;26(5):791-6. doi: 10.1016/0042-6989(86)90094-5.
The spatial vision of two adult galagos (Galago crassicaudatus) was assessed using a two choice discrimination task to determine their contrast sensitivity. Both contrast sensitivity functions exhibited low and high spatial frequency attenuation with the peak sensitivity at 1%. For one animal, the peak occurred at 0.5 c/deg and the extrapolated cutoff frequency was 2.6 c/deg; for the other, the peak was 1 c/deg and the cutoff was 4.3 c/deg. For this animal, grating acuity was also tested and, depending upon definition of threshold, yielded threshold estimates from 4.8 to 6.0 c/deg. The data supports the conclusion that the spatial vision of the galago and the cat is quite similar, a congruence that presumably reflects their adaptation to a nocturnal niche, rather than their divergent phylogenetic origins.
使用双选辨别任务评估了两只成年粗尾婴猴（Galago crassicaudatus）的空间视觉，以确定它们的对比敏感度。两个对比敏感度函数均表现出低空间频率和高空间频率衰减，峰值敏感度在1%。对于一只动物，峰值出现在0.5周/度，外推截止频率为2.6周/度；对于另一只动物，峰值为1周/度，截止频率为4.3周/度。对于这只动物，还测试了光栅视力，根据阈值定义，得出的阈值估计为4.8至6.0周/度。数据支持这样的结论，即婴猴和猫的空间视觉非常相似，这种一致性大概反映了它们对夜间生态位的适应，而不是它们不同的系统发育起源。
