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The Psycho-Acoustic Laboratory was established in 1940 to conduct research on speech, hearing, and communications during World War II. It continued to operate after the War and in 1962 it was renamed the Laboratory of Psychophysics. These records document the activities of the laboratory.
Stanley Smith Stevens (1906-1973) was a physicist and professor at Harvard University. He was an authority on the physics of sensory perception, especially hearing. He was director of the Psycho-Acoustics Laboratory and the Psychophysics Laboratory at Harvard. This collection documents Stevens' research and professional activities.