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.