Table 1.

Action potential properties of DA neurons after chronic haloperidol treatment

	Half-width (msec)	First peak (mV)	Second peak (mV)	Threshold (mV)	AHP (mV)
Without TEA
Control	3.2 ± 1.4	33.1 ± 3.1	30.5 ± 2.1	−44.5 ± 0.9	−56.2 ± 1.5
Vehicle	3.3 ± 0.9	32.1 ± 3.4	32.4 ± 4.6	−45.0 ± 1.4	−57.9 ± 2.1
Haloperidol	4.3 ± 1.3	35.4 ± 3.2	33.6 ± 3.5	−46.1 ± 1.2	−58.9 ± 1.6
With TEA
Control	185 ± 62	21.0 ± 1.7	20.7 ± 2.4	−43.2 ± 2.4	−45.2 ± 2.6
Vehicle	155 ± 88	27.5 ± 2.6	25.7 ± 5.7	−38.9 ± 4.6	−48.4 ± 2.2
Haloperidol	126 ± 55	27.9 ± 1.5	24.6 ± 4.5	−40.5 ± 3.2	−53.7 ± 1.6

Half-width, The time between two peaks of first derivative; first peak, peak of the first spike; second peak, peak of the second spike; threshold, the first point on the rising phase of the spike where the rate of rise exceeded 20 mV/msec; AHP, afterhyperpolarization. n = 5-6.