Blough P M
J Exp Anal Behav. 1975 Sep;24(2):135-48. doi: 10.1901/jeab.1975.24-135.
Three experiments used similar methods to investigate the pigeon's perception of saturation of monochromatic lights. This trial-wise procedure consisted of brief presentations of positive and negative stimuli in random sequence. Pecks to the positive stimuli were occasionally reinforced on a low fixed-ratio schedule. The first study determined absolute thresholds for "white" and monochromatic lights by establishing a discrimination between lights of various radiances and a dark key. Experiment II investigated generalization from a white light to various monochromatic lights under conditions that minimized the use of luminance as a cue. The third experiment examined discrimination of various monochromatic lights along a colorimetric purity continuum; responses to white light were reinforced, while responses to lights that combined white and monochromatic lights in various proportions were not. The results indicated that lights of different wavelength differ in saturation, but that all are discriminable from white. Wavelengths between 550 and 600 nm are least saturated for the pigeon, and saturation increases markedly as wavelength decreases below this region of the spectrum.
三项实验采用了相似的方法来研究鸽子对单色光饱和度的感知。这种逐次试验程序包括以随机顺序短暂呈现正性和负性刺激。对正性刺激的啄击偶尔会按照低固定比率时间表得到强化。第一项研究通过建立不同辐射度的光与一个暗键之间的辨别，确定了“白色”光和单色光的绝对阈值。实验二在尽量减少使用亮度作为线索的条件下，研究了从白光到各种单色光的泛化。第三个实验考察了沿着比色纯度连续体对各种单色光的辨别；对白光的反应得到强化，而对以不同比例混合了白光和单色光的光的反应则未得到强化。结果表明，不同波长的光在饱和度上存在差异，但所有光都可与白光区分开来。对于鸽子来说，550至600纳米之间的波长饱和度最低，并且当波长低于光谱的这个区域时，饱和度会显著增加。
