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Effect of 55 dB SPL contralateral tones on SOAE level and frequency collapsed across all SOAEs included in this study. Thirty-five SOAEs from 8 subjects were divided into 4 frequency bins. The tuning functions for SOAE frequency and level changes appear to be mirror images of each other. Error bars represent ±1 SE. *Significant shifts (2-sided t-test, P < 0.01).
