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. 2020 Jul 1;124(2):360–374. doi: 10.1152/jn.00143.2020

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Fig. 4. — Efferent synapses at rat type II hair cells (HCs) exhibit paired-pulse facilitation. A: averaged paired-pulse responses with interstimulus intervals (ISIs) of 500 ms (A1), 100 ms (A2), 40 ms (A3), and 20 ms (A4) averaged across 200 trials for each ISI. B: paired-pulse ratio (PPR) is inversely correlated with ISIs. Ratios of overall responses (S2/S1) and release probability (P2/P1) were enhanced at shorter intervals (20 ms: P2 = 0.30 ± 0.09, P1 = 0.09 ± 0.02; 40 ms: P2 = 0.25 ± 0.06, P1 = 0.09 ± 0.01; 100 ms: P2 = 0.20 ± 0.04, P1 = 0.09 ± 0.01; 500 ms: P2 = 0.11 ± 0.04, P1 = 0.10 ± 0.04; n = 4, paired t test: P < 0.05 for 20, 40, and 100 ms, P = 0.3 for 500 ms), while the ratio of amplitudes (A2/A1) was unaltered (20 ms: A2 = 16.6 ± 4.7, A1 = 11.7 ± 5.0; 40 ms: A2 = 18.0 ± 5.6, A1 = 13.0 ± 3.2; 100 ms: A2 = 19.0 ± 5.0, A1 = 19.2 ± 6.7; 500 ms: A2 = 14.5 ± 3.1, A1 = 14.1 ± 3.1; n = 4, paired t test: P > 0.05 for all).