Figure 10.

The same EI cell shown in Figure 5, but the contralateral intensity was 50 dB SPL, and thus the contralateral intensity was 40 dB more intense than was presented in Figure 5. A, Responses to contralateral tones, ipsilateral tones, and tones presented binaurally. B, The circuit that could generate the responses. The circuit is the same as in Figure 5 with the addition of a high-threshold, inhibitory input from the DNLL to account for the reduced spike count at 50 dB SPL, i.e., the upper-threshold rate level function. C, IID function based on normalized spike counts. D, Responses to ipsilateral tone alone at 50 dB SPL and the binaural response evoked by binaural tones with the same ipsilateral intensity superimposed at higher magnification. E, Superimposed responses showing that virtually the same responses were evoked by binaural signals when contralateral signals were 10 or 50 dB SPL and ipsilateral intensity was 50 dB SPL. Tone duration, 20.0 ms.