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. Author manuscript; available in PMC: 2015 Sep 1.
Published in final edited form as: J Exp Anal Behav. 2014 Jul 5;102(2):151–161. doi: 10.1002/jeab.97

Fig. 1.

Fig. 1

Relative subjective value of the 16- and 32-pellet reinforcers plotted as a function of delay. Symbols represent the estimated indifference points (subjective values), and curves represent the best-fitting hyperbolic discounting functions (Eq. 1 with s set equal to 1.0) for each pigeon and for the group means. The 16-pellet delayed amount is represented by solid curves and filled circles; the 32-pellet delayed amount is represented by dashed curves and open circles.