Type E/I inhibitory combination-sensitive interactions are not eliminated by application of STRY or BIC. A: Type E/I unit tested with BIC (15 nA). Although BIC increased the magnitude of responses to both tones, inhibition at delays between 4 and 8 ms remained strong. [BF, 59.53 kHz, 24 dB SPL; LF, 18.9 kHz, 76 dB SPL] B: Type E/I unit tested with STRY (20 nA). Drug application reduced the combination-sensitive inhibition at delays between 4 and 6 ms, but did not eliminate it. [BF, 59.08 kHz, 28 dB SPL; LF, 19.3 kHz, 74 dB SPL] See Figure 1 for explanation of graphs.