CONCEPT
Three-Term Contingency
The atomic unit of Skinner's behavioral analysis — discriminative stimulus, operant response, reinforcing consequence — applied by the Skinner volume to every AI interaction as blank prompt, typed query, system reply.
The three-term contingency is the fundamental structural unit of operant behavior: a discriminative stimulus (S^D) signals the availability of reinforcement; an operant response (R) is emitted; a reinforcing consequence (S^R) follows, increasing the probability that R will occur when S^D is present in the future. The three terms are not independent — they specify a relational structure in which the consequence depends on the response in the context of the stimulus. Every complex behavioral phenomenon decomposes into chains and combinations of three-term contingencies, and the structure is so general that it describes both pigeons pecking keys for grain and software engineers prompting Claude for code. The Skinner volume uses this unit as its analytical atom for every subsequent mechanism.
In The You On AI Field Guide
The three-term contingency replaced the two-term stimulus-response formulations of early twentieth-century behaviorism by adding the consequence as a necessary element of the analytical unit. This addition was decisive because it recognized that the relationship between stimulus and