Figure 4.

Relative subjective value as a function of delay in months for representative participants selected on the basis of fits of Equation 1. The left, middle, and right columns show data from participants whose R²s for the full hyperboloid model were at the 25^th, 50^th, and 75^th percentiles (R²s of .83, .89, and .92, respectively). For simplicity, only three amount conditions are shown: $20 (top row of panels), $20,000 (middle row), and $500,000 (bottom row). In each panel, the solid curve represents the fit of the full model; the dashed curve represents the fit of the reduced model.