Table 2.

Movement-related modulations of beta subthalamic rhythms

	Low beta					High beta
	b	p	m	r		b	P	m	r
AM (a.u.)
Before levodopa	Mean	0.74	0.74	0.71	0.84	0.37	0.29	0.21	0.44
	s.d.	0.34	0.38	0.49	0.34	0.30	0.28	0.36	0.32
After levodopa	Mean	0.42	0.38	0.33	0.51	0.31	0.24	0.13	0.36
	s.d.	0.37	0.34	0.37	0.39	0.35	0.28	0.27	0.37
FM (Hz)
Before levodopa	Mean	17.11	17.18	17.45	16.89	26.43	26.49	26.59	25.95
	s.d.	1.46	1.47	1.41	1.29	1.12	1.33	1.64	1.00
After levodopa	Mean	17.07	17.1	16.68	17.06	26.55	26.68	26.81	26.48
	s.d.	1.58	1.47	1.25	1.73	1.13	1.19	1.24	1.18

The table reports means and standard deviations (s.d.) of the amplitude modulations (AM, in log power arbitrary units, a.u.) and the frequency modulations (FM, in Hz) for the low-beta and the high-beta poles, of all nuclei recorded before (n = 14) and after (n = 14 nuclei) levodopa administration. Entries for each nucleus were obtained by averaging the pole values of individual nuclei in four movement-related time windows: b= baseline (4 s to 2 s before movement onset), p= pre-movement (0.5 s to 0 s before movement onset), m= movement (0 s to 1 s after movement onset), r= recovery (2 s to 3 s after movement onset). The full movement-related AM/FM curves corresponding to this table are shown in Fig. 3.