ABSTRACT
This chapter considers that what appears to be another category of behaviour, behaviour that is neither strengthened and maintained by reinforcement nor elicited by stimuli, but that nevertheless is generated by some schedules of reinforcement. This third category is termed adjunctive behaviour. Operant behaviour is schedule-induced behaviour, but not all schedule-induced behaviour is operant. There are three distinct parts to a schedule-induced pattern of behaviour: interim behaviour, facultative behaviour, and terminal behaviour. Interim behaviour occurs immediately after reinforcement, while terminal behaviour occurs prior to reinforcement. If the interval between reinforcements is sufficiently long, facultative behaviour will occur between interim and terminal behaviour. Although facultative behaviour may be part of a schedule-induced pattern, it is not itself schedule induced because it would have occurred even if the schedule had not been in effect. Terminal behaviour is likely not an unconditioned response elicited by the reinforcer because it occurs too long after the reinforcer.
