Table 1. Effects of multi-unit and single-unit HFS on glutamatergic unitary synaptic responses in the SNr.

HFS type	Parameter	Control		HFS
		Average	±SE	Average	±SE	N	%Change	p
Multi-unit	FV in STN (µV)	835,08	185,43	861,25	285,79	8	none	ns
	FV in SNr (µV)	673,51	154,31	589,44	135,59	9	none	ns
Multi-unit	uEPSC occlusion-positive
	Amplitude (pA)	23,26	3,15	5,88	1,14	9	−75	<0.001
	PPR	0,84	0,09	1,36	0,20	9	63	0,022
	CV (%)	53,97	6,07	179,24	22,18	9	232	<0.001
	Success rate (%)	86,53	3,57	33,60	6,75	9	−61	<0.001
Multi-unit	uEPSC occlusion-negative
	Amplitude (pA)	46,27	7,58	20,10	4,03	27	−57	<0.001
	PPR	0,86	0,06	1,30	0,12	27	52	<0.001
	CV (%)	29,64	5,31	78,00	24,09	27	163	0,035
	Success rate (%)	89,86	1,87	56,97	5,92	27	−37	<0.001
Multi-unit	uEPSC occlusion-negative
	Failures excluded
	Amplitude (pA)	42,07	8,18	28,11	5,07	15	−33	0,002
	PPR	0,83	0,06	1,04	0,06	15	25	0,002
	CV (%)	36,67	2,72	38,46	2,72	15	none	ns
Multi-unit	uEPSC occlusion-negative
	GABA(B) block
	Amplitude (pA)	55,66	14,32	37,56	7,50	11	−33	0,070
	PPR	0,95	0,10	1,07	0,15	11	12	ns
	CV (%)	0,51	0,07	0,84	0,29	11	63	ns
	Success rate (%)	89,54	3,75	78,63	8,64	11	−12	ns
Single-unit	uEPSC
	Amplitude (pA)	68,69	11,86	26,51	5,28	9	−61	0,001
	PPR	0,91	0,09	1,09	0,06	8	20	0,033
	CV (%)	41,09	5,29	61,02	5,76	8	49	0,007
	Success rate (%)	93,89	2,63	58,89	10,79	9	−37	0,011