Proust Was a Neuroscientist is a non-fiction book written by Jonah Lehrer, first published in 2007. In it, Lehrer argues that many 20th and 21st-century discoveries of neuroscience are actually re-discoveries of insights made earlier by various artists, including Gertrude Stein, Walt Whitman, Paul Cézanne, Igor Stravinsky, and, as mentioned in the title, Marcel Proust.