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Change in the envelope after KA treatment. A: responses are the sum curves for a high-frequency (3,000 Hz) tone at the intensities shown. The envelope (solid and dashed horizontal lines) became more negative after treatment with KA. B: curves from the same data as in A, including additional intensities. For the pre-KA and KA curves, the envelope was measured as the difference from baseline, and the Abs. Change curve is the absolute value of the difference between the 2 curves.
