Table 4. Parameter estimates and group comparison on the winning model and prior combination.

Values represent the mean (standard deviation) of the final estimated posterior mean estimates for each individual. The ‘Group HDI’ column comprises the upper and lower bounds of the 95% highest density intervals (HDI) of the comparison between the symptomatic and control groups. If the HDI does not encompass zero, we consider there to be a meaningful difference between the groups. We find a main effect of group on the punishment learning rate, lapse, and decay (when included) parameters only (in bold).

bandit4arm_lapse	Symptomatic	Control	Between group HDI
Reward Sensitivity	7.47   (2.91)	9.61   (4.87)	-4.55       0.65
Punishment Sensitivity	7.41   (7.21)	6.67   (4.83)	-4.95       2.24
Reward Learning Rate	0.31   (0.30)	0.25   (0.22)	-0.11       0.17
Punishment Learning Rate	0.51   (0.18)	0.31   (0.15)	0.08       0.38
Lapse	0.21   (0.10)	0.13   (0.11)	0.02       0.2
bandit4arm_lapse_decay	Symptomatic	Control	Between group HDI
Reward Sensitivity	11.41   (5.03)	10.94   (7.20)	-4.77       6.35
Punishment Sensitivity	4.64   (5.02)	3.00   (3.10)	-0.87       1.93
Reward Learning Rate	0.21   (0.23)	0.23   (0.22)	-0.13       0.07
Punishment Learning Rate	0.95   (0.01)	0.75   (0.14)	0.04       0.26
Lapse	0.22   (0.10)	0.10   (0.03)	0.04       0.18
Decay	0.61   (0.25)	0.41   (0.31)	0.10       0.40