. Author manuscript; available in PMC: 2020 Mar 1.

Published in final edited form as: Learn Behav. 2019 Mar;47(1):66–79. doi: 10.3758/s13420-018-0339-9

Table 1.

Design table for all experiments. R1 and R2 are separate levers in the chamber. O1 and O2 are counterbalanced grain- or sucrose-based reinforcers. Cues are 2-s presentations of key lights, tones, or a compound of both. A + indicates that the cue coincides with reinforcer delivery and a / indicates that it does not. See text for additional details.

Experiment	Phase 1	Phase 2		Test
1a	R1:O1	R1:Ext R2:O2 + Cue		R1:Ext R2:Cue		R1:Ext R2:Ext
1b	R1:O1	R1:Ext R2:O2 + Cue		R1:Ext R2:Cue		R1:Ext R2:Ext
1b	R1:O1	R1:Ext R2:O2 / Cue		R1:Ext R2:Cue		R1:Ext R2:Ext
1c	R1:O1	R1:Ext R2:O2 + Cue		R1:Ext R2:Cue		R1:Ext R2:Ext
1c	R1:O1	R1:Ext R2:O2 + Cue		R1:Ext R2:Ext / Cue		R1:Ext R2:Ext
2	R1:O1	R1:Ext R2:O2 +Cue 1	R2:O2 +Cue2	R1:Ext R2:Cue 1	R1:Ext R2:Cue 1	R1:Ext R2:Cue 1