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.