Table 2.

Changes on the E–I ratio of the frequency, amplitude, and charge of spontaneous EPSCs and IPSCs in 3 versus 1 mm extracellular Ca²⁺

	3 mm Ca2+	1 mm Ca2+
Pyramidal cells
Frequency	0.71 ± 0.23	13.76 ± 10.53*
Amplitude	0.91 ± 0.21	1.78 ± 0.31*
Charge	0.77 ± 0.25	2.48 ± 0.66*
n	6	6
Interneurons
Frequency	5.64 ± 4.07	35.75 ± 17.09*
Amplitude	1.79 ± 0.59	2.53 ± 1.01
Charge	1.19 ± 0.48	1.71 ± 1.19
n	6	4

Experiments were performed with standard pipette solution (see Materials and methods), and events were detected at −60 mV.

*p < 0.05 for statistical comparisons between different calcium concentrations.