Figure 4.
Temporal pattern of contralateral inhibition and information transfer rates. In each panel, mean ± SE information transfer curves (n = 9) are shown for monaural presentation of a RAM stimulus (I; thick black lines) and for binaural stimulation with the same RAM stimulus (I+C; thin black lines). The gray lines are the transfer functions for binaural stimulation with the following stimuli presented to the ON1-ipsilateral ear: a constant tone with same CF as the AN-ipsilateral RAM stimulus (I+CTO) (A); a RAM stimulus with different AM envelope, but identical bandwidth, SD, and CF as the AN-ipsilateral stimulus (I+CENV)(B); a RAM stimulus with the same AM envelope as the AN-ipsilateral stimulus but with different carrier frequency (I+CCF) (C). Because the mean firing of ON1 differs for stimuli with the same mean intensity relative to threshold but different CF (Marsat and Pollack, 2004), we adjusted the intensity of the ON1-ipsilateral stimulus so that firing rate was similar to that for I+C stimulation. Points that are indicated by filled circles (I+C) or open triangles (I+CCF) differ significantly from the corresponding points for monaural stimulation (I; ANOVA followed by Tukey; p < 0.05). Firing rates, shown in insets, were lower for all binaural conditions compared with the corresponding monaural one (ANOVA followed by Tukey; p < 0.05).