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Depth of forward masked tuning curves. The depth of masked tuning curves is shown for the six tested subjects for the basal channel 5 (top) and apical 7 (bottom) as a function of probe configuration (abscissa). Depth of tuning was measured as the difference between masker levels required for off-channel maskers compared to on-channel maskers in dB (ordinate). The probe stimulus was always delivered to channel 6.
