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. 2014 Feb 26;34(9):3237–3246. doi: 10.1523/JNEUROSCI.3664-13.2014

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Copyright © 2014 the authors 0270-6474/14/343237-10$15.00/0

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Figure 8. — Efficacy of postsynaptic coincidence detection. A, Temporal summation: Presynaptic (black) and postsynaptic (gray) current-clamp recording from an endbulb synapse in the VNLL. Five consecutive presynaptic APs were evoked by 1 ms current injections. B, The fraction of postsynaptic neurons that generate an AP upon presynaptic stimulation as a function of stimulus number. Closed symbols represent 200 Hz stimulation (n = 10), and open symbols represent 100 Hz stimulation (n = 10). C, Coincidence detection: A presynaptic evoked AP was paired with a subthreshold postsynaptic EPSC-like current injection. See stimulation protocol on top. Time interval between both stimuli was varied between 0 and 22.5 ms to determine the time window of suprathreshold summation. D, AP probability as a function of the interstimulus time interval (ISI) from (C). Open gray symbols represent single cells; black symbols represent average over n = 9 cells. Dashed line indicates a sigmoid fit to the average data.