Question: who emphasized that slips of the tongue?
Answer: Each day, most of us make somewhere between 7 and 22 verbal slips. Sigmund Freud, whose name is indelibly linked with such gaffes, called them Fehlleistungen (faulty actions) in his 1901 book, The Psychopathology of Everyday Life. He deemed them notable for revealing an unconscious thought, belief, wish, or motive.