- Category : 1904-births
- Type : MGE
- Profile : 6/2 - Role Model / Hermit
- Definition : Triple Split
- Incarnation Cross : LAX Duality 2
German-American experimental psychologist whose research focused on perception and learning. Although he was trained in the Gestalt psychology tradition, much of his later work explored the adaptability of perceptual systems based on the perceiver's experience, whereas most Gestalt theorists emphasized inherent qualities of stimuli and downplayed the role of experience. Wallach's studies of achromatic surface color laid the groundwork for subsequent theories of lightness constancy, and his work on sound localization elucidated the perceptual processing that underlies stereophonic sound. He was a member of the National Academy of Sciences, a Guggenheim Fellow, and recipient of the Howard Crosby Warren Medal of the Society of Experimental Psychologists.
Wallach was married to artist Phoebe Kasper, and they had a son Karl. Phoebe died in 1968. Hans Wallach died at age 93 on 5 February 1998 in Media, Pennsylvania. Their son Karl Wallach died in 2001.