Table 3.

MCI group parameter values used in, and the results of, the simulation study to determine individual parameter contributions to group differences in accuracy rate. Each column label indicates the main parameters of interest (S = sensitivity, A = accumulation speed, C = caution) that were “normalized” in each simulation condition by setting the MCI group’s average value to the average value of the HOA group. The “none” column indicates the simulation in which no MCI group parameters were normalized. In the S+A+C column, all parameter values were normalized, and the values reported therefore perfectly correspond to the average values of the HOA group. For clarity, the values of the raw LBA parameters (b.1, b.2, b.3, vc, ve, sve) that were used in each simulation for the MCI group are displayed along with the values of the main summary parameters of interest. The predicted between-group difference in accuracy rates (Acc. Diff.) and the percentage of the empirical between-group difference in accuracy rates (.11) that the predicted accuracy rates account for (% Acc. Diff.) are the primary outcome measures. These percentages can be greater than 100% if the model predicted a larger group difference than is present in the empirical data.

	None	C	A	S	A+C	S+C	S+A	S+A+C
b.1	1.43	1.11	1.43	1.43	1.11	1.11	1.43	1.11
b.2	1.25	1.11	1.25	1.25	1.11	1.11	1.25	1.11
b.3	1.78	1.32	1.78	1.78	1.32	1.32	1.78	1.32
vc	1.71	1.71	1.46	1.78	1.46	1.78	1.51	1.51
ve	1.52	1.52	1.27	1.47	1.27	1.47	1.20	1.20
sve	0.81	0.81	0.81	0.42	0.81	0.42	0.42	0.42
Sensitivity	0.21	0.21	0.21	0.40	0.21	0.40	0.40	0.40
Accu. Speed	1.62	1.62	1.36	1.62	1.36	1.62	1.36	1.36
Caution	1.49	1.18	1.49	1.49	1.18	1.18	1.49	1.18
Ace. Diff.	0.12	0.12	0.12	0.05	0.12	0.05	0.02	0.03
% Ace. Diff.	109%	109%	109%	45%	109%	45%	18%	27%