Table 2.

R² values for Linear, Hyperbolic and Exponential model fits across rewards and groups.

	Money			Food
	Linear	Hyperbolic	Exponential	Linear	Hyperbolic	Exponential
High PS	0.9	0.7	0.5	0.9	0.5	0.3
Medium PS	0.8	0.9	0.6	0.9	0.8	0.5
Low PS	0.9	0.8	0.6	0.9	0.7	0.3
Overall	0.9	0.8	0.6	0.9	0.6	0.4