S.S. Stevens & Psychoacoustics
Through his numerous experiments, Stevens developed the Power Law, which stated that the subjective sensation of physical magnitude is equal to the objective physical magnitude raised to an exponent that is constant, but specific to the specific type of stimulus (such as loudness, light, etc.). Stevens also authored The Handbook of Experimental Psychology, a well-known reference book that was the first of its kind and is still widely used today.
This 1956 article from the Harvard Crimson describes the Psychological Laboratories that, at the time, inhabited the lower floors of Memorial Hall. It includes mention of many of the pioneers in the field: James, Munsterberg, Stevens, Skinner and others.