Table 1.

Electrophysiological features of pyramidal cells and interneurons in 3 and 1 mm extracellular Ca²⁺ concentration

	Pyramidal cells		Interneurons
	3 mm Ca2+	1 mm Ca2+	3 mm Ca2+	1 mm Ca2+
RMP (mV)	−54.31 ± 3.32**	−60.55 ± 6.80	−50.11 ± 5.74§§§	−49.09 ± 4.83§§§
Resistance (MΩ)	108.19 ± 28.81	103 ± 22.82	145.27 ± 43.68**§§§	220.85 ± 101.97§§§
Time constant (ms)	15.24 ± 4.09**	9.43 ± 6.24	5.39 ± 1.72§§§	5.93 ± 1.43
AP threshold (mV)	−38.06 ± 5.82***	−48.58 ± 7.15	−34.78 ± 5.93**§	−39.45 ± 3.29§§§
AP duration (ms)	0.79 ± 0.16	0.79 ± 0.23	0.58 ± 0.16§§§	0.58 ± 0.12§§
n	23	9	19	11

RMP, Resting membrane potential; AP, Action potential. Resistance and time constant are estimated in current clamp at resting membrane potential with current pulses of ±0.1 nA. All measurements were performed at resting membrane potential to assess how changes of intrinsic properties affect the integration of synaptic activity. *Statistical comparisons between similar neuronal types in different calcium concentrations. ^§Statistical comparisons between different neuronal types in similar calcium concentrations. *^,§p < 0.05; **^,§§p < 0.01; ***^,§§§p < 0.001.