Table 1.

Demographic and Rating Scale Measures. UPDRS = The Unified Parkinson's Disease Rating Scale; MMSE = Mini-Mental Status Exam; NAART = North American Adult Reading Test; Beck= Beck Depression Inventory.

	PD Patients - Mean(SD)	Controls - Mean(SD)
Age(years)	64.4(6.8)	66.4(8.0)
Sex	12 males/1 female	11 males/3 females
Handedness	13 right/0 left/0 ambidex.	12 right/1 left/1 ambidex.
MMSE	29.2(.6)	29.6(.6)
NAART	41.1(10.3)	46.4(7.1)
Beck*	8.9(6.9)	3.4(2.7)
UPDRS**	5O.8(7.5)-OFF Stim. 36.8(6.9)-ON Stim.	N/A

^*t(25) = 2.76, p=.011

^**t(12) = 9.63, p<<.0001 for ON stimulation vs OFF stimulation; higher values reflect more impaired performance. Maximum score is 108.