Table 2.

Parameter fits for the alternative models.

DOI: http://dx.doi.org/10.7554/eLife.17688.018

Task		RT Task				PDW
Model description		Different bound heights (B0) for high and low volatility				Two maps	Two maps, gradually	Two maps and two bounds
Subject		M1	S1	S2	S3	M2	M2	M2
κ	drift rate	10.56	8.71	10.76	12.31	10.72	10.40	10.44
B0	bound parameter	1.77	1.27	1.47	1.94	2.24	2.27	2.92
∆B0	bound increase, high volatility	0.17	−0.06	−0.14	0.17	NA	NA	-1.0495
a	bound parameter	0.72	−1.98	−1.97	−2.16	NA	NA	NA
d	bound parameter	0.31	−0.33	−0.07	−0.47	NA	NA	NA
${\mu }_{tnd}$	mean non-dec. time (s)	0.28	0.35	0.33	0.37	NA	NA	NA
${\sigma }_{tnd}$	stdev non-dec. time (s)	0.056	0.037	0.02	0.001	NA	NA	NA
ϕ	conf. separatrix	NA	NA	NA	NA	0.626	0.628	0.629
β	noise scaling param.	1.04	1.11	0.82	2.37	1.99	1.60	1.96
α	noise scaling param.	0.673	0.003	.0007	0.716	0.672	0.619	0.35
γ	noise scaling param.	0.66	1.76	1.79	0.94	0.32	0.415	0.16
$\tau$	Speed of volatility information accrual (s)	NA	NA	NA	NA	NA	79.36	NA
∆BIC	Relative to base models	29.42	7.7	27.3	12.1	252.4	7.24	126.9

NA: not applicable.