Observations in the changes of the effectiveness of this faculty at different times of day led to the discovery of the Purkinje shift.
The dominant theory of this faculty was empirically tested with the "cancellation method" by Dorothea Jameson and her husband Leo Hurvich. Observations in the changes of the effectiveness of this faculty at different times of day led to the discovery of the Purkinje shift. Its effectiveness can be tested through the Farnsworth Lantern Test and the Ishihara test, which consists of a series of variously sized dots. Disorders affecting this ability include protanomaly and protanopia. Ewald Hering spent his whole career in a debate with Hermann von Helmholtz over the mechanism of this faculty, although modern theories generally unify the "opponent process theory" and the "Young-Helmholtz theory." For 10 points, name this faculty which is caused by cone cells in human beings and which is unavailable to dogs.
The dominant theory of this faculty was empirically tested with the "cancellation method" by Dorothea Jameson and her husband Leo Hurvich.
color vision [accept color perception or color recognition, prompt on "vision"]