Outlines of a Theory of the Light Sense

according achromatic colors activity adaptation already appears assimilation assumed background become binocular blue border brighter brightness brightness differences called chromatic clear close completely component consequently constant continuously contrast corresponding curves dark darkening decrease depends described determined direction discussed disk dissimilation distance effect elements equal example excitation experiments external fact FIGURE fixation front given glass gray greater green half hand hole homogeneous illumination increase increment individual induct influence latter less light intensity look magnitude means mixture objects observation occur phenomena plate position possible primary processes produced radiation ratio rays reflected remains result retina retinal image screen seen sensation separation shadow side simultaneous somatic specific spectrum stimulus strip surface surround theory tion total illumination valence veiled visible vision visual field visual substance window yellow