Table 1.

Priors of free parameters in tested models

Parameter	Description	Prior
ω	Bias	IL(0, 1.4)
t 0, c	Nondecision time of choice	IL(0, 1.4)
$v_0,v_s,v_d$	Drift rate coefficients of choice	LN(1.56, 1.5)
${\rho }_t^{\ast }$	Mean drift rate of timer	LN(1.56, 1.5)
${\eta }_c,{\eta }_t^{\ast }$	Within-trial variability	LN(1.56, 1.5)
γ *	Mixture between random and evidence-based timer-induced decision	IL(–1, 1.0)

^IL inverse logit distribution.

^LN log normal distribution.

^*parameters only exist in TRDM.

The best fitting parameters of the two models for each animal are shown in Extended Data Tables 1-2 and 1-3. We also tested the relationship between RT and contrast difference using nonmodel statistics described in Extended Data Table 1-1.