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

Published in final edited form as: J Exp Psychol Anim Learn Cogn. 2019 Apr 29;45(3):338–349. doi: 10.1037/xan0000209

Table 1.

Experimental Designs

Group	Phase 1	Phase 2		Test
Experiment 1
Constant	R1-O1 (VI 12 s)	R1: Ext	R1: Ext
Constant	R2: Ext	R2-O2 (VI 6 s)	R2: Ext
Alternating	R1-O1 (VI 12 s)	R1: Ext	R1: Ext
Alternating	R2: Ext	R2-O2 (VI 3 s; Odd blocks) Ext (Even blocks)	R2: Ext
Experiment 2
O1	R1-O1 (VI 12 s)	R1: Ext	R1: Ext	O1 (VT 12 s)
O1	R2: Ext	R2- O2 (VI 12 s)	R2: Ext	O1 (VT 12 s)
O2	R1-O1 (VI 12 s)	R1: Ext	R1: Ext	O2 (VT 12 s)
O2	R2: Ext	R2-O2 (VI 12 s)	R2: Ext	O2 (VT 12 s)
Resurgence	R1-O1 (VI 12 s)	R1: Ext	R1: Ext
Resurgence	R2: Ext	R2-O2 (VI 12 s)	R2: Ext

Note. Reinforcers always consisted of a 1-s presentation of a snack (O1) or $0.10 coin (dime; O2) image. R1 represents the reinforced button during Phase 1. R2 represents the reinforced button during Phase 2. The two buttons were always available. VI = variable interval; VT = variable time; Ext = extinction