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. Author manuscript; available in PMC: 2017 Apr 1.
Published in final edited form as: J Exp Psychol Anim Learn Cogn. 2016 Feb 15;42(2):141–162. doi: 10.1037/xan0000097

Figure 1.

Figure 1

Changes in subjective value of a smaller-sooner (SS) reward and a larger-later (LL) reward. The heights of the bars represent the nominal (i.e., undiscounted) amount of reward. The curves show how subjective values change as a function of delay to the rewards according to the hyperbolic model of discounting (Equation 2). The point at which the two curves intersect indicates the point of preference reversal from LL at T1 to SS at T2.