CHAPTER VIII


THE SENSE OF SIGHT: BRIGHTNESS VISION (_Continued_)

The delicacy of brightness discrimination--Methods of testing the dancer's
ability to detect slight differences in brightness--Results of tests with
gray papers--Relation of intensity of visual stimuli to the threshold of
discrimination--Weber's law apparatus and method of experimentation--
Results of Weber's law tests--Practice effects, the training of vision--
Description of the behavior of the dancer in the discrimination box
experiments--Modes of choice: by affirmation; by negation; by comparison--
Evidence of indiscriminable visual conditions.


CHAPTER IX

THE SENSE OF SIGHT: COLOR VISION

Does the dancer see colors?--The food-box method of testing color vision--
Waugh's food-box method--Results of tests--Tests by the use of colored
papers in the visual discrimination box--Yellow-red vision--Blue-orange
vision--Brightness vision _versus_ color vision--Brightness check
tests--Green-blue vision--Violet-red vision--Conclusions.


CHAPTER X

THE SENSE OF SIGHT: COLOR VISION (_Continued_)