Fig. 7.

Tuning of synaptic currents differs for onset vs. steady-state response. h_ETH(t) and h_EI(t) were normalized to their maximums for a given stimulus MF. Normalized h_EI(t) is positive, although all nonnormalized values are negative. A: normalized synaptic currents elicited for the 1st cycle of modulated stimuli plotted vs. phase angle. As MF increases, there is an increasing delay in h_EI(t) relative to h_ETH(t). B: maximum of the difference of the normalized 1st cycle currents plotted vs. MF. Inhibition makes the network high pass for peak current. C: normalized synaptic currents for 1 cycle at steady-state (SS) response of modulated stimuli vs. phase angle. Measurements are taken from the cycle starting 500 ms after stimulus onset. At higher MFs, h_EI(t) summates temporally and remains elevated during the duration of the cycle. D: maximum of the difference of the normalized steady-state currents vs. MF. Temporal summation of h_EI(t) and inhibition makes the network band pass with respect to peak current for repetitive stimuli.