Table 7.

Select parameter values from σ and η models for fit to single-stimulus task. a is the boundary separation, T_er is the mean non-decision time, s_z is the range of the across-trial variability of the starting point, p_z is the proportion of uniformly distributed contaminant responses, s_t is the range of the across-trial variability in non-decision time, z is the starting point of the evidence accumulation process, s₁ is the scaling parameter for within-trial variability in the σ model, η is the standard deviation for across-trial variability in drift in the σ model, and e₁ and e₂ are the scaling parameters for across-trial variability in drift rate in the η model.

σ model	a	T_er	s_z	p_z	s_t	z	s₁	η
σ model	0.114	0.357	0.088	0.001	0.153	0.059	0.008	0.072
η model 1	a	T_er	s_z	p_z	s_t	z	e₁	e₂
η model 1	0.109	0.357	0.085	0.002	0.153	0.056	0.007	0.062
η model 2	a	T_er	s_z	p_z	s_t	z	e₁	e₂
η model 2	0.109	0.357	0.086	0.001	0.153	0.056	0.096	0.0001