Input (grade 13): Stanley Smith Stevens (4 November 1906 - 18 January 1973) was an American psychologist who founded Harvard's Psycho-Acoustic Laboratory and is credited with the introduction of Stevens' power law.
Output (grade 12): Stanley Smith Stevens (4 November 1906 - 18 January 1973) was an American psychologist. He founded Harvard's Psycho-Acoustic Laboratory and introduced Stevens' power law.