Table 2.

Effects of D-APV or saline on firing properties of STN neurons recorded during the control and effect periods. Data are presented as mean ± SEM of post-injection values, normalized to the pre-injection baseline of the respective cells. The significance was assessed using independent-sample t-tests, comparing the ratios obtained with D-APV to those obtained with saline injections.

		D-APV (4)	Saline (11)
		Normalized values	Normalized values	P
Firing rate		0.30 ± 0.06	1.14 ± 0.14	<0.001
CV of inter-spike intervals		1.55 ± 0.48	1.33 ± 0.28	0.714
Integrated spectral power	1–3 Hz	0.95 ± 0.36	1.12 ± 0.15	0.681
	3–8 Hz	0.84 ± 0.13	1.06 ± 0.03	0.182
	8–13 Hz	1.01 ± 0.09	1.02 ± 0.04	0.882
	13–30 Hz	1.39 ± 0.20	1.08 ± 0.04	0.224
	30–100 Hz	1.15 ± 0.15	0.98 ± 0.01	0.332
Proportion spikes in bursts		1.15 ± 0.06	1.03 ± 0.06	0.198
Number of spikes per burst		1.12 ± 0.21	1.00 ± 0.04	0.623
Intra-burst firing rate		0.66 ± 0.05	1.10 ± 0.07	<0.001