Merigan W H, Katz L M
Department of Ophthalmology, University of Rochester Medical Center, NY 14642.
Vision Res. 1990;30(7):985-91. doi: 10.1016/0042-6989(90)90107-v.
Grating acuity was measured as a function of eccentricity from the fovea in two macaques. A vertical-horizontal orientation discrimination was used to determine acuity, and the retinal locus of the test grating was controlled by training them to fixate a spot placed at various distances from the stimulus. Their head was fixed in place and fixation was monitored with a scleral search coil. The acuity of monkeys across the retina was similar to that previously measured in human subjects, reaching a peak of about 38 c/deg at the fovea, and decreasing about 10-fold by 30 deg eccentricity. Acuity was slightly higher in the temporal than in the nasal visual field. The shape of the acuity-eccentricity function suggested a dependence on cone density near the fovea, and on the density of P ganglion cells at eccentricities beyond 10 deg. Existing physiological data suggest the possibility that macaque acuity may also be limited in part by spatial averaging across the receptive field of retinal ganglion cells.
在两只猕猴中，测量了光栅视敏度作为离中央凹偏心度的函数。使用垂直 - 水平方向辨别来确定视敏度，通过训练它们注视放置在距刺激物不同距离处的一个点来控制测试光栅的视网膜位置。它们的头部被固定在一个位置，并用巩膜搜索线圈监测注视情况。猕猴整个视网膜的视敏度与先前在人类受试者中测量的相似，在中央凹处达到约38周/度的峰值，并在偏心度为30度时下降约10倍。颞侧视野的视敏度略高于鼻侧视野。视敏度 - 偏心度函数的形状表明，在中央凹附近依赖于视锥细胞密度，而在偏心度超过10度时依赖于P神经节细胞的密度。现有的生理学数据表明，猕猴的视敏度也可能部分受到视网膜神经节细胞感受野空间平均的限制。
