“…Suffice it to say that despite the voluminous amount of literature available, no scientific data support the psychoanalytic position. More recently, investigators have conceptualized such habits in learning theory terms (Palermo, 1956) and the evidence provides support for a learning theory approach to their etiology and treatment (Benjamin, 1967;Davis et al, 1948;Sears and Wise, 1950;Davidson et al, 1967;Larsson, 1972;Baer, 1962;Graber, 1958).…”