The psychologist knows the interesting Psychophysical law according to which the differences in the strength of our impressions are perceived as equal, not when the differences of the stimuli are really equal, but when the stimuli stand in the same relation.
"Psychology and Social Sanity"
Hugo Münsterberg
You too have been leading an Emersonian life-though the environment differs to suit the needs of the different Psychophysical organism which you present.
"The Letters of William James, Vol. II"
William James
An interview with Dr. I. M. Niemand, Director of the Psychophysical Institute of Solar and Terrestrial Relations, Camarillo, California.
"Disturbing Sun"
Robert Shirley Richardson