Phrenology (from Greek: φρήν, phrēn, "min"; and λόγος, logos, "knowledge") is a defunct field of study, once considered a science, by which the personality traits of a person were determined by "reading" bumps and fissures in the skull. Developed by German physician Franz Joseph Gall around 1800, the discipline was very popular in the 19th century. In 1843, François Magendie referred to phrenology as "a pseudo-science of the present day." Phrenological thinking was, however, influential in 19th-century psychiatry and modern neuroscience.