Humanski R A, Wilson H R
Department of Ophthalmology, University of Chicago, IL 60637.
Vision Res. 1993 Mar-Apr;33(5-6):665-75. doi: 10.1016/0042-6989(93)90187-2.
The frequency selective effects of spatial adaptation were measured with vertically-oriented, cosine stimuli upon an intense long-wavelength (yellow) field, which isolated the short-wavelength-sensitive (S) cones. Consistent with isolated-S-cone spatial threshold and masking results, the adaptation measurements demonstrate S-cones input to multiple, orientation selective, spatial frequency mechanisms. Moreover, the adaptation measurements show the minimum number of S-cone mechanisms is three. The frequency tuning of each mechanism was derived from the S-cone threshold and masking results. Two of the tuning curves are bandpass with peak sensitivities in a vicinity of 0.7 and 1.4 c/deg, respectively. These two closely resemble tuning curves derived from results with luminance-modulated stimuli. Confined to the range of frequencies examined (0.25-2.83 c/deg), the third tuning curve is lowpass with a high-frequency cutoff of roughly 2.0 c/deg. However, subsequent measurements of orientation selectivity demonstrate the third mechanism to have bandpass frequency tuning as well.
利用垂直取向的余弦刺激，在强烈的长波长（黄色）场中测量空间适应的频率选择效应，该场隔离了短波敏感（S）视锥细胞。与孤立S视锥细胞的空间阈值和掩蔽结果一致，适应测量表明S视锥细胞输入到多个方向选择性空间频率机制。此外，适应测量表明S视锥细胞机制的最小数量为三个。每个机制的频率调谐是从S视锥细胞阈值和掩蔽结果推导出来的。其中两条调谐曲线是带通的，峰值灵敏度分别在0.7和1.4 c/deg附近。这两条曲线与从亮度调制刺激结果得出的调谐曲线非常相似。限于所研究的频率范围（0.25 - 2.83 c/deg），第三条调谐曲线是低通的，高频截止约为2.0 c/deg。然而，随后的方向选择性测量表明，第三种机制也具有带通频率调谐。
