Fig. 7.

Effect of KA across frequencies and intensities. A: difference and summed responses to a low frequency (750 Hz) before and after KA treatment. The response at moderate intensities was smaller in the difference curve and essentially gone in the average curves. The reference 1-μV response level occurred to a stimulus of 21 dB SPL. B: difference and summed responses to a high frequency (3,000 Hz) before and after KA treatment. The response was relatively unaffected by the KA. The reference 1-μV response level occurred to a stimulus of 16 dB SPL. C: post-KA responses across frequency and intensity, averaged across animals (n = 6; error bars are SE). Unlike the responses without KA (see Fig. 2), there was no difference between high and low frequencies after treatment with KA.