“…This relationship has been demonstrated in heart-rate conditioning (Chatterjee and Erikson, 1962;Notterman, Schoenfeld, and Bersh, 1952) and in GSR conditioning (Bridger and Mandel, 1965;Cook and Harris, 1937;Koenig and del Castillo, 1969;Mowrer, 1938;Silverman, 1960;Wickens, Allen, and Hill, 1963). Given this frequently replicated phenomenon in human subjects, and the obvious similarity to aversion therapy during which clients are generally aware when an aversive event is probable and when it is not, it is not surprising that Feldman (1966) was less than sanguine about the successes of aversion therapy.…”