Fig. 6.
PSP depression and recovery after a train of pulse pairs (10 msec interpulse interval), referred to as tetanus (20 Hz). A—C, Neuron with fast-type PSPs (resting potential, −65 mV). A, Pairs of pulses (P1, P2) followed by a tetanus (20 Hz). An identical paired pulse follows the tetanus (35 msec delay). B, Time-expanded view of responses to the end of the tetanus and the second paired pulse shown in A. C, Post-tetanus delay of 350 msec. D–F, Same asA–C but for a neuron with slow-type PSPs. The time scale for E and F is the same as that forB and C.