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Mean IC difference (ΔIC) thresholds as a function of reference IC for younger NH (filled circles) and older HI (open circles) collapsed across ITDs from Experiment I, and modeled older HI thresholds generated from noises based on NH thresholds mixed with independent noises attenuated by 7 dB (crosses) and 9 dB (open squares). The model describes the older HI thresholds well contingent on the independent-noise attenuation chosen.
