Table 4.

Design of an experiment demonstrating occasion setting of instrumental responding by the context

Phase
Acquisition	Reinforcer Devaluation	Test
A: R1-O1, R2-O2	A: O2-Illness	A: R1, R2
B: R1-O2, R2-O1	B: O2-Illness	B: R1, R2

A and B refer to different contexts; R1 and R2 refer to different responses; O1 and O2 are different food pellets (grain and sucrose). illness was created by lithium chloride injection. This is a within-subject design; thus, every subject received the treatments shown in each phase in an intermixed fashion. Bold indicates the response with the higher level during the test. [See Trask and Bouton (211).]