“…Since the initial reports of observations of experimental neurosis in laboratory animals (Pavlov, 1927) there have been a vast number of studies in a variety of settings which have essentially confirmed Pavlov's findings. Although there have been some controversies regarding the identity between experimental neurosis and human neuroses and even more numerous attempts to rigidly define neurosis and delimit the phenomenon, there seems to be little doubt that it exists and that it can be produced in at least some members of all species generally used in the laboratoryfor example, sheep, goats, and pigs (Liddell, 1944); dogs and cats (Dimmick, Ludlow, & Whiteman, 1939;Dworkin, 1939;Gantt, 1944;Karn, 1940;Masserman, 1943;Wolpe, 1958); rats (Bijou, 1942;Cook, 1939); and primates (Jacobson, Wolfe, & Jackson, 193S;Krasnogorsky, 1925;Masserman & Pechtel, 1953).…”