Controls (n=15)	(a) All HD (n=27)	Sig. test	(b) Unmedicated HD (n=13)	Sig. test	(c) Premanifest HD (n=3)	Sig. test
Global absolute alpha	18.12 (15.04)	56.09 (62.61)	z = -1.719; p = .086	52.24 (74.21)	z = -.990; p = .332	33.87 (41.55)	z = -.296; p = .767
Global absolute delta	10.11 (3.01)	43.45 (10.83)	z = -5.316**; p = .0000001	41.08 (8.32)	z = -4.491**; p = .000007	43.27 (1.45)	z = -2.666**;  p = .008
Relative alpha AP gradient	-0.40 (0.13)	-0.10 (0.11)	z = -4.633**; p = .000004	-0.12 (0.12)	z = -3.893**; p = .0001	-0.18 (0.11)	-2.073*; p = .038
Relative delta AP gradient	0.37 (0.23)	0.12 (0.13)	z = -3.137**; p = . 002	0.13  (0.14)	z = -2.511*; p = . 012	0.10 (0.06)	z = -1.599 ; p = .110