Table 1.

Demographic and rating scale measures

PD patients—mean (SD)Controls—mean (SD)
Age (years)64.4 (6.8)66.4 (8.0)
Sex12 males/1 female11 males/3 females
Handedness13 right/0 left/0 ambidex.12 right/1 left/1 ambidex.
MMSE29.2 (0.6)29.6 (0.6)
NAART41.1 (10.3)46.4 (7.1)
Beck*8.9 (6.9)3.4 (2.7)
UPDRS**
    OFF Stim.50.8 (7.5)N/A
    ON Stim.36.8 (6.9)N/A

  • MMSE, Mini-Mental Status Exam; NAART, North American Adult Reading Test; Beck, Beck Depression Inventory.

  • ↵*t(25) = 2.76, p = 0.011;

  • ↵**t(12) = 9.63, p ≪ 0.0001 for ON stimulation versus OFF stimulation; higher values reflect more impaired performance. Maximum score is 108.