Diana Deutsch (born 15 February 1938) is a British-American psychologist from London, England. She is a professor of psychology at the University of California, San Diego, and is a prominent researcher on the psychology of music. Deutsch is primarily known for her discoveries in music and speech illusions. She also studies the cognitive foundation of musical grammars, which consists of the way people hold musical pitches in memory, and how people relate the sounds of music and speech to each other. In addition, she is known for her work on absolute pitch (perfect pitch), which she has shown is far more prevalent among speakers of tonal languages. Deutsch is the author of ''Musical Illusions and Phantom Words: How Music and Speech Unlock Mysteries of the Brain'' (2019), the editor for ''Psychology of Music'', and also the compact discs ''Musical Illusions and Paradoxes'' (1995) and ''Phantom Words and Other Curiosities'' (2003).
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