Figure 4.

Training-induced alterations in IL afterhyperpolarizing potentials. A1, Example trace showing the fAHP measured after the second and third spikes of an 800 ms current step. A2, Group data showing that extinction reduced the fAHP after the second evoked spike. B1, Example traces showing the voltage change in response to 800 ms depolarizing pulse used to elicit an mAHP and an sAHP (spikes are truncated). The mAHP was measured at the peak hyperpolarization, and the gray box indicates where the sAHP was measured. B2, Group data for the sAHP showing that conditioning enhanced the sAHP relative to the other two groups. C1, Averaged traces for the three groups showing the voltage response to a hyperpolarizing current step of −20 pA. C2, No difference in the resulting voltage sag was observed between the groups, suggesting that training had no effect on the activation of H-channels (**p < 0.01; *p < 0.05).