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Illustration of suspected MEMR recorded using laboratory technique. For all subjects a 602-Hz probe-tone was presented for 4 s in the test ear. A BBN activator was presented at five levels (50, 60, 70, 80, and 90 dB SPLs) in the contralateral ear between 1 and 1.5 s. Left panel: example of a subject showing measurable change in probe magnitude and phase starting at 70 dB SPL. Right: example of a subject with no measurable change in probe magnitude or phase at 90 dB SPL.
