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. Author manuscript; available in PMC: 2017 Nov 1.
Published in final edited form as: Pharmacol Biochem Behav. 2016 Sep 15;150-151:31–38. doi: 10.1016/j.pbb.2016.09.004

Figure 1.

Figure 1

Hypothetical probability-discounting data for 12 rats showing how a drug can differentially alter A and b parameter estimates. (a) The drug decreases responding for the large magnitude reinforcer when the odds against obtaining that reinforcer are set to 3, 7, 15, and 31 (left column), which corresponds to no change in the A parameter estimate (center column) but an increase in the b (log-transformed) parameter estimate (indicating increased risk aversion; right column). (b) The drug decreases responding for the large magnitude reinforcer across each block of trials (left column), which corresponds to a decrease in the A parameter estimate (indicating decreased sensitivity to reinforcer magnitude; center column) but no change in risk taking (right column). The data are presented as mean (± SEM). *p < .05 relative to drug treatment.