Table 1.

Demographic and flanker task data for PD and HC groups.

	HC	PD	P-value
Sample size	17	28
Age (years)	62.3 (9.5)	65.5 (9.5)	0.27
Education (years)	17.2 (3.7)	15.8 (2.6)	0.15
Gender (M:F)	9:8 (53% male)	17:11 (61% male)	–
Depression rating (CES-D)	12.4 (4.1)	14.6 (6.1)	0.32
UPDRS motor total	–	19 (1.68)	–
AMNART (estimated IQ)	118.9 (9.1)	115.6 (10.4)	0.30
MMSE (raw score)	29 (0.9)	28.6 (1.6)	0.37
Flanker task
Accuracy instructions
Congruent (Cg) Flankers
RT (ms)	475 (81)	492 (59)
Accuracy (%)	99.8 (0.6)	98.9 (1.1)
Incongruent (Ig) Flankers
RT (ms)	546 (91)	567 (74)
Accuracy (%)	98.6 (1.6)	97.0 (2.4)
Flanker effect (Ig–Cg)
RT (ms)	72 (24)	76 (34)
Accuracy (%)	–1.1 (1.5)	–1.4 (1.8)
Speed instructions
Congruent (Cg) Flankers
RT (ms)	422 (58)	456 (67)
Accuracy (%)	99.5 (0.7)	98.5 (1.4)
Incongruent (Ig) Flankers
RT(ms)	494 (59)	546 (87)
Accuracy (%)	94.9 (3.5)	94.3 (4.9)
Flanker effect (Ig–Cg)
RT (ms)	72 (25)	91 (43)
Accuracy (%)	–4.6 (3.6)	–4.1 (5.2)