Fig. 6. Responses of the fast-depressor motoneuron of M103d to converging inputs from a femoral (feCS2) campaniform sensillum and a posterior spur afferent. (A) Single feCS2 spikes as well as short bursts of the spur afferent are followed by excitatory postsynaptic potentials (EPSPs) in the motoneuron. When the afferent spikes of both receptors reach the motoneuron at about the same time they are able to elicit spikes. (B) Individual spikes from both types of receptors arising 16 ms apart evoke only EPSPs in the fast-depressor motoneuron. Conductance delays are 2 ms for feCS2 and 12 ms for the spur afferent, and EPSP amplitudes differ. (C) When the spur afferent arises 6 ms before the campaniform sensillum, both effects summate and elicit spikes.

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