Color vision and color preference in the albino rat. Part I. Historical Summary and criticism.

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Abstract
Part I consists of an analysis of the techniques and data of previous experimenters with a view to determining the reasons for failure to obtain positive evidence of color vision in the lower mammals. There is also a summary of the work which has been done upon color preference. Part II describes the color vision and color preference expts. on the white rats. Using the chromopnthometer (by means of which certain delays between trials were avoided) and a specially designed discrimination box the rats were found to show a positive preference for blue and green lights. On the discrimination problem, the lights were equated in brightness for the human eye during the training period to remove the major differences. During the control expts. the brightnesses were shifted up and down the scale to eliminate this as a factor in the discrimination of hue. The rats were found to discriminate red-blue, red-green, blue-yellow and red-yellow, but not green-blue and yellow-green combinations.
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