Since the pioneering studies of Hebb and his associates (2) on the effects of sensory deprivation on human beings, numerous investigators have conducted experimental studies under varying conditions in an effort to establish consistent trends in behaviour of subjects exposed to such conditions. Since only two other laboratories, both using male subjects, have reported underwater studies in deprivation (1, 5), an attempt to replicate our findings of sex differences in response to the situation by use of this method seemed to be in order.