Table 1.

Electrophysiological properties of striatal FSIs.

	Bursting (n = 140)	Irregular (n = 77)	Regular (n = 46)
Resting membrane potential (mV)	−74 ± 0.5	−74 ± 0.6	−76 ± 1
Input resistance (MΩ)	60 ± 2	63 ± 3	59 ± 5
Membrane time constant (ms)	9.8 ± 0.2	9.5 ± 0.4	9.3 ± 0.4
AP peak amplitude (mV)	60 ± 1	55 ± 2	58 ± 2
AP threshold (mV)	−45 ± 0.6	−43 ± 0.5	−46 ± 1
AP width (ms)	0.54 ± 0.01	0.56 ± 0.01	0.55 ± 0.02
AP time to peak (ms)	0.44 ± 0.01	0.46 ± 0.01	0.46 ± 0.02
AHP amplitude (mV)	15 ± 0.4	14 ± 0.5	13 ± 0.7

All values are means ± s.e.m. Input resistance and membrane time constant were measured on passive voltage responses to injection of negative current pulses (−100 pA, 500 ms). Action potentials (APs) were elicited by injection of suprathreshold current pulses (400 pA, 500 ms). AHP: afterhyperpolarization. AP time to peak and AHP were calculated using the spike threshold as a reference point.