Skip to main content
. Author manuscript; available in PMC: 2015 Mar 1.
Published in final edited form as: Behav Processes. 2013 Nov 27;103:156–164. doi: 10.1016/j.beproc.2013.11.004

Figure 3.

Figure 3

Procedure used in Stagner and Zentall (2010). Pigeons chose between two alternatives. Choice of one alternative (e.g., left) was followed either by a stimulus (e.g., red) on 20% of the trials that was always followed by reinforcement or by a different stimulus (e.g., green) on 80% of the trials that was never followed by reinforcement. Choice of the other alternative (i.e., right) was followed by either of two stimuli (blue or yellow) each of which was followed by reinforcement 50% of the time. Spatial location and colors were counterbalanced.