Table 1.

Delta expected values across the ten trial types used in the risky choice task

Risky wheel			Safe wheel			Difference in expected value (ΔEV) between wheels	Trial number
Pr (gain)	Gain	Loss	Pr (gain)	Gain	Loss
0.25	20	−80	0.50	10	−10	−55	2
0.25	80	−80	0.50	10	−10	−40	4
0.25	20	−20	0.50	10	−10	−10	6
0.75	20	−80	0.50	10	−10	−5	3
0.25	80	−20	0.50	10	−10	+5	0
0.75	20	−20	0.50	10	−10	+10	7
0.75	80	−80	0.50	10	−10	+40	5
0.75	80	−20	0.50	10	−10	+55	1
0.50	0	−80	0.00	0	−40	0 (− frame)	8
0.50	80	0	1.00	40	0	0 (+ frame)	9

− and + frame indicate the negative and positive framing trials

Pr probability