Table 1.

Summary of the Conditions in Experiment 1. The column titled d’ Between Reward Curves measures the discriminability of the two reward curves as a function of the increasing variability. Similarly, the column titled d’ Between States measures the discriminability of two adjacent states (i.e, between two adjacent points in the same reward curve).

Condition	Noise Level	d’ Between Reward Curves	d’ Between States
No Noise (NN)	~N(0,σr=0)	–	–
Low Noise (LN)	~N(0,σr=70)	7.14	1.43
Medium Noise (MN)	~N(0,σr=100)	5.0	1.0
High Noise (HN)	~N(0,σr=300)	1.67	0.33