Spontaneous EPSPs are faster, and their frequency increases at high temperature. A1, EPSPs were recorded from an afferent fiber at 23°C (black) and 31°C (red). The membrane current of fiber was clamped at 0 pA. A2, A total of 1250 and 1817 EPSPs were recorded at 23°C (black) and 31°C (red), respectively. The EPSP amplitude distributions were fit with a Gaussian function. A3, Average EPSPs recorded at 23°C (black solid line) and 31°C (red solid line) were normalized to their peak values. Dashed lines are single-exponential fits to the decay phase of the average EPSPs. In this example, τ_decay was 1.8 ms at 23°C (black dashed line) and 1.1 ms at 31°C (red dashed line), respectively. B1, EPSPs were recorded from the same afferent fiber as shown in Figure 2B1–B3, at 23°C (black) and 31°C (red). B2, A total of 1054 and 1581 EPSPs were recorded under room and high temperature. B3, Average of EPSPs recorded at 23°C (black) and 31°C (red) were normalized to their peak values. Single-exponential fits to the decay phase of averaged EPSPs (dashed lines) revealed that τ_decay was 1.1 ms at 23°C and 0.7 ms at 31°C, respectively.