Table 4.

Partial correlations of FA with cognitive measures in Parkinson’s disease.

	Verbal working memory		Verbal fluency	Cognitive flexibility	Inhibition	Visuospatial
	Forward	Back	Letter	Trails B-A	Stroop	JLOT
FA
Corpus callosum
[1] Mid-anterior	0.355*	0.367*	0.401*
Frontal
[4] L caudal anterior cingulate			0.457**
[5] R caudal anterior cingulate			0.539***
[6] L anterior corona radiata			0.404*			0.605***
[7] L superior corona radiata		0.565***
[10] L rostral middle frontal		0.568***	0.570***
[12] L pars triangularis				−0.368*
[13] L pars opercularis			497**
Parietal
[14] L paracentral		0.454**	0.442*
Occipital
[24] R pericalcarine				−0.466**
Subcortical
[27] L external capsule	0.394*	0.453**		−0.356*	0.422*

*p < 0.05, **p < 0.025, ***p < 0.01.

Z scores for each measure were correlated with FA in each ROI, adjusting for age and gender. Numbers in brackets correspond to the ROI listed in Table 3. Back, backward span; JLOT, Judgment of Line Orientation.