The Expression of the Emotions in Man and Animals a greater role for the higher cortical centres in the regulation of the emotional response, and touches on the theme of gender differences in emotional expression, anticipating the approach of sociologist Norbert Elias in "The Civilizing Process". In 1905, Sir Arthur Mitchell, a psychiatrist who had served as William A.F. Browne's deputy in the Scottish Lunacy Commission, published "About Dreaming, Laughing and Blushing", bridging some of Darwin's concerns with those of psychoanalysis. Freud's early publications on the symptoms of hysteria (with his influential concept of unconscious emotional conflict) acknowledged debts to Darwin's work on emotional expressionand Darwin's impact on psychoanalysis
The Descent of Man, and Selection in Relation to Sex to the forces of sexual selection. While debates on the subject continues, in January 1871 Darwin started on another book, using left over material on emotional expressions, which became "The Expression of the Emotions in Man and Animals". In recent years controversy also involved the peacock tail, the most famous symbol of the principle of sexual selection. A seven-year Japanese study of free-ranging peafowl came to the conclusion that female peafowl do not select mates merely on the basis of their trains. Mariko Takahashi found no evidence that peahens expressed any preference for peacocks with more elaborate trains, such as