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. Author manuscript; available in PMC: 2016 Jul 1.
Published in final edited form as: Behav Processes. 2015 May 12;116:87–99. doi: 10.1016/j.beproc.2015.05.003

Figure 2. Large reward as the comparison outcome.

Figure 2

Large magnitude comparisons. A. Group data showing the three different responses including nosepoke, leverpress and food cup retrieval. The abscissa provides the different session blocks with the initial single outcome block (SOB) followed by the mixed outcome block (MOB) and the final single outcome block (SOB). The nosepoke response was significantly faster in the MOB compared to either the initial or final SOB (# p < .01). B. An individual example of this positive contrast effect for the nosepoke response. C. Comparing the large outcome to the medium-sized outcome, we found a decrease in nosepoke latency and an increase for lever press for both outcomes during the MOB (# p < .01; Ϯ p < .05). D. Displays responses from an individual animal during the series for the nosepoke. This result represents positive contrast but without discrimination between the outcomes suggesting a possible variety effect (# p < .01)