title: Reflections on the past and comments on the present.
authors.forename: W S
authors.initials: WS
authors.lastname: Stiles
mesh_terms: D003118:Color Perception / Q000502:physiology; D004739:England; D049673:History, 20th Century; D006801:Humans; D011601:Psychophysics / Q000266:history; D012684:Sensory Thresholds