Table 2.

Correlations between the behavioral measures, age, depression score (BDI), and the PET measures in HC (n=62, except for correlations with cholinergic PET measures, n =10) and PD (n = 135).

			Individual Characteristics			Task Performance			Cholinergic PET		Dopaminergic PET
				age	BDI	color naming	Stroop conflict	dual conflict	thalamic k3	cortical k3	putamen DVR	caudate DVR
HC	Individual Characteristics	age	r	1.00	−.09	.23	.53	.40	.00	.12	−.28	−.46
		age	p		.510	.068	^**	.001	.999	.746	.030	^**
		BDI	r	−.09	1.00	−.01	−.01	−.04	.23	.28	−.02	.02
		BDI	p	.510		.957	.913	.739	.524	.427	.881	.872
	Task Performance	color naming	r	.23	−.01	1.00	.15	.20	−.20	.05	.03	−.04
		color naming	p	.068	.957		.233	.114	.583	.894	.798	.784
		Stroop conflict	r	.53	−.01	.15	1.00	.72	−.37	−.23	−.26	−.32
		Stroop conflict	p	^**	.913	.233		^**	.290	.529	.039	.011
		dual conflict	r	.40	−.04	.20	.72	1.00	−.55	−.47	−.23	−.30
		dual conflict	p	.001	.739	.114	^**		.097	.176	.068	.017
	Cholinergic PET	thalamic k3	r	.00	.23	−.20	−.37	−.55	1.00	.82	.10	.09
		thalamic k3	p	.999	.524	.583	.290	.097		.004	.791	.807
		cortical k3	r	.12	.28	.05	−.23	−.47	.82	1.00	.04	.01
		cortical k3	p	.746	.427	.894	.529	.176	.004		.923	.976
	Dopaminergic PET	putamen DVR	r	−.28	−.02	.03	−.26	−.23	.10	.04	1.00	.83
		putamen DVR	p	.030	.881	.798	.039	.068	.791	.923		^**
		caudate DVR	r	−.46	.02	−.04	−.32	−.30	.09	.01	.83	1.00
		caudate DVR	p	^**	.872	.784	.011	.017	.807	.976	^**
PD	Individual Characteristics	age	r	1.00	−.13	.29	.30	.24	−.25	−.24	.06	−.19
		age	p		.148	.001	^**	.005	.004	.005	.492	.024
		BDI	r	−.13	1.00	.09	.03	.03	.15	.25	−.15	−.09
		BDI	p	.148		.322	.753	.746	.088	.004	.090	.320
	Task Performance	color naming	r	.29	.09	1.00	.48	.56	−.16	−.17	−.15	−.34
		color naming	p	.001	.322		^**	^**	.065	.050	.078	^**
		Stroop conflict	r	.30	.03	.48	1.00	.62	−.11	−.15	−.13	−.24
		Stroop conflict	p	^**	.753	^**		^**	.212	.076	.124	.005
		dual conflict	r	.24	.03	.56	.62	1.00	−.17	−.24	−.14	−.25
		dual conflict	p	.005	.746	^**	^**		.046	.004	.113	.004
	Cholinergic PET	thalamic k3	r	−.25	.15	−.16	−.11	−.17	1.00	.58	.11	.23
		thalamic k3	p	.004	.088	.065	.212	.046		^**	.194	.006
		cortical k3	r	−.24	.25	−.17	−.15	−.24	.58	1.00	.23	.27
		cortical k3	p	.005	.004	.050	.076	.004	^**		.008	.002
	Dopaminergic PET	putamen DVR	r	.06	−.15	−.15	−.13	−.14	.11	.23	1.00	.80
		putamen DVR	p	.492	.090	.078	.124	.113	.194	.008		^**
		caudate DVR	r	−.19	−.09	−.34	−.24	−.25	.23	.27	.80	1.00
		caudate DVR	p	.024	.320	^**	.005	.004	.006	.002	^**

^**

indicates p < .0005