Table 3.

Model comparison for each outcome variable

Variable	Model	K	W	Chisq	p
Stroop Int	1	17	0.45
Stroop Int	2	18	0.31	1.31	0.2532
Stroop Int	3	19	0.24	1.47	0.2247
Symbol Digit	1	17	0.16
Symbol Digit	2	18	0.61	4.72	0.0298
Symbol Digit	3	19	0.23	0.05	0.8264
Trails A	1	17	0.30
Trails A	2	18	0.43	2.75	0.0971
Trails A	3	19	0.27	1.14	0.2863
Trails B	1	17	0.00
Trails B	2	18	0.02	8.76	0.0031
Trails B	3	19	0.98	10.26	0.0014
Putamen	1	17	0.08
Putamen	2	18	0.11	2.57	0.1088
Putamen	3	19	0.81	6.08	0.0137
Caudate	1	17	0.19
Caudate	2	18	0.09	0.49	0.4826
Caudate	3	19	0.72	6.34	0.0118
Frontal White	1	17	0.18
Frontal White	2	18	0.56	4.32	0.0377
Frontal White	3	19	0.25	0.46	0.4967

Note. K = number of model parameters; W = AIC weight; df = 1 for all chi-squared (Chisq) tests.