Srudies of responsivicy to verbal conditioning have rarely investigated the relationship between S's conditionability and his awareness of the contingency becween his behavior and E's reinforcing behavior. Frequently assumptions are made about the effect of awareness on performance, uiz., either that it facilitates or that it inhibits responsiveness. However, if the results of verbal operant conditioning studies are to shed light on more complex interpersonal siruacions, such as psychotherapy (Krasner, 1955;Frank, 1959), systematic study of che effects of awareness is necessary since awareness or insight is widely held co be a requisite for personalicy change. Aside from such theoretical implications for che study of interpersonal behavior, there are important methodological considerations involving "awareness." For example, at present there is no experimental basis for deciding whether to include or exclude aware Ss when analyzing the data from verbal conditioning studies.The concept of awareness can be defined operationally in many different ways. The presenc authors' position is chac "awareness" is not a single phenomenon, but refers to a complex of different cognitive events. Therefore, in the presenc study, awareness was first investigated as a dependent variable by the technique of reported awareness, which is typical of verbal conditioning studies. Awareness was then treated as an independent variable and was manipulated by means of two different sets of instructions.The issue of whether there can be learning without awareness is not central to the presenc study. The authors' position is similar to that expressed by Adams (1957) and by Eriksen (1960), uzz., that evidence for such learning is equivocal. A review of the verbal conditioning literature suggests few specific hypotheses about the conditions which lead to increased reported awareness. The typical method for collecting data about awareness in verbal conditioning studies has involved open-ended questions after completion of che verbal conditioning procedures (Greenspoon