The law of effect and CR contingent modification of the UCS

A persistent theoretical contention in the American conditioning literature is that Conditional Reflexes (CR) are reinforced through some hidden Thorndikian law of effect. In its most general form, law of effect theories hold that Conditional Reflex-Unconditional Stimulus (UCS) overlap modifies the sensory consequences of the UCS to provide the source of differential reinforcement of CRs. However, consideration of the historical development of law of effect theories reveals they have lacked testability due to the fact that the sources of reinforcement have been alleged to beintrinsically related to the occurrence and topography of CRs. Such a postulated intrinsic relationship has made it difficult to experimentally manipulate the amount of CR-correlated reinforcement, since the source of reinforcement is presumed to be under The Subject’s (S’s) control. Some experiments will be reported in which the relation between CRs and properties of the UCS are madeextrinsic and, accordingly, permit an experimental assessment of law of effect formulations.