Verbal concept "mediators" as simple operants.

A series of experiments is summarized, in historical rather than logical order. The results of these experiments indicate that one type of verbal operant, the notate, a discriminated verbal response(1) by a subject to stimuli experimentally presented, occurs in at least four kinds of situations, "concept-identification," "problem-solving," "association" and "conditioning." In two of these it becomes chained with other such operants, to form the notant-a fuller verbal statement about the environment, or the monent-a self-administered instruction, that is, an S(D) for further behavior. All three classes of operant, each behaving slightly differently from one another in behavior, seem to constitute the behavioral basis of statements about "hypotheses." Unlike "mediating responses," or "processes," these verbal behaviors are not theoretically inferred, or indirectly manipulated, but rather are subject to direct experimental investigation. The relationship of their strength to the strength of the behaviors that they control is demonstrable.