Fig. 3.

MODEL 2 and SAM stimuli. (a) MODEL 2 contains two MSO populations (red: left MSO; blue: right MSO), each comprising fifty linear, single-compartment model neurons, with fast or slow membranes. Each model MSO neuron receives four excitatory inputs ‘bilaterally’ from linear, single-compartment model SBCs. Three independently simulated, medium-spontaneous-rate model ANFs (Zilany et al., 2014) each provide an individually depressing excitatory synapse to a model SBC. (b) ITD tuning functions for the two MSO populations are shown for a 2-s, 600-Hz pure tone. (c) SAM stimuli applied as left (blue) and right (red) inputs, with positive ITD introduced during the rising, peak, or falling portions of the AM cycle (dark grey line shows instantaneous ITD). Speech stimuli (Fig. 1) were presented separately to MODEL 1