Table 1.

Extracellular levels of glutamate and GABA (expressed as a micromolar concentration) measured in the SNr (n = 5–6) on the stimulated side of intact and SNc-lesioned rats in basal conditions and evoked by STN high (I₁)- or low (I₂)-intensity stimulation

	Intact			SNc-lesioned
	Basal	STN–HFS I1	STN–HFS I2	Basal	STN–HFS I1	STN–HFS I2
Glu (μm)	0.09 ± 0.014	0.13 ± 0.008 (+44%; p < 0.001)	0.09 ± 0.004 (No effect)	1.88 ± 0.708	3.18 ± 0.225 (+69%; p < 0.001)	1.54 ± 0.034 (No effect)
GABA (μm)	0.006 ± 0.0007	0.009 ± 0.0006 (+50%; p < 0.001)	0.006 ± 0.0002 (No effect)	0.020 ± 0.004	0.019 ± 0.002 (No effect)	0.028 ± 0.002 (+40%; p < 0.001)