The purpose of this study is to examine the influence of social deprivation-satiation operation on subject's awareness of response-reinforcement con-tingendy. Experiment I showed that a subject's awareness is an important factor in considering the effect of social reinforcement. Twenty-four preschool boys took part in a 10-minute social satiation session, in which they received the stimulus word, "orikousan-danee", either 2 (deprivation) or 16 (satiation) times. This was followed by a discrimination test of 75 trials, in which the same stimulus word was given to all correct response. The test was administered by the experimenter in a preceeding session or by another individual , unkhown to the subjects. At the end of the test; they were asked about their awareness of response-reinforcement contingency.