. Author manuscript; available in PMC: 2014 Jul 22.

Published in final edited form as: Psychol Rev. 2013 Jul;120(3):697–719. doi: 10.1037/a0033152

Table 1.

Model Parameters

Model and parameters	Parameter symbol
	T_er	s_t	a	σ	s_b
Confidence model	384	76	0.038	0.093	0.78
Three-choice model	392	155	0.066	0.120	1.04

Decision boundaries	b₁	b₂	b₃	b₄	b₅	b₆
Confidence model	1.64	1.71	2.41	2.53	1.92	1.75
Three-choice model	1.46	1.48	2.26

Confidence criteria	c₁	c₂	c₃	c₄	c₅
Confidence model	−0.96	−0.06	0.67	1.56	2.44

Memory strength means	μ_hfN	μ_hfS	μ_hfW	μ_lfN	μ_lfS	μ_lfW
Confidence model	0.00	2.20	1.81	0.68	3.04	2.37

Memory strength standard deviations	s_hfN	s_hfS	s_hfW	s_lfN	s_lfS	s_lfW
Confidence model	0.85	1.19	1.29	0.92	1.58	1.90

Three-choice model drift rates	v₁	v₂	v₃
40:10:10	0.56	0.20	0.24
30:20:10/40:30:10	0.46	0.34	0.20
10:10:30	0.20	0.21	0.59

Note. T_er is the mean nondecision time, s_t is the range in nondecision time, a is the scaling factor that multiplies drift rate, σ is the standard deviation in within trial variability, s_b is the range in variability in the decision boundaries, and b₁–b₆ are decision bounds. For the three-choice model, b₃ is higher than b₁ and b₂ because it is correct for a low proportion of the trials. For the confidence model, c₁–c₅ are confidence criteria from the division between high confidence new and medium confidence new to the division between medium confidence old and high confidence old, hf represents high frequency, lf represents low frequency, N represents new, W represents weak studied items (1.5 s per pair), and S represents strong studied items (5 s per pair). For the three-choice model, across trial standard deviation in drift rate for the largest drift rate was .042.