Table 1.

Differential outcome expectancy test procedures of experiment 2

Stimulus	Correct response→outcome	Errors
S1	R1→01	R2—, R3—
S2	R2→02	R1—, R3—
S3	R3→01/02	R1—, R2—

In each of the five sessions of discrimination training, three discriminative stimuli were presented, and three response devices were available. 01 and 02 were two flavored sucrose solutions used as reinforcing outcomes (counterbalanced), R1 was a paddle-push response, and R2 and R3 were lever-press and chain-pull responses (counterbalanced). Bold type indicates the different-outcome error (see Results). S1 was the illumination of a visual stimulus on one side of the chamber, and S2 and S3 were two other visual stimuli (counterbalanced). → indicates a response-outcome contingency; - indicates no scheduled consequence of a response.