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Spectrum contrast thresholds were measured in normal-hearing listeners using comb-filtered signals. The signal spectrum contained 0.075-oct wide ripples of varying depths. The ripple depth thresholds were measured at ripple densities from 1 to 7/oct using a two-alternative forced-choice adaptive procedure. The lowest ripple depth thresholds of less than 0.1 appeared at a ripple density of 3 to 4/oct. At lower ripple densities down to 1/oct, the thresholds increased up to 0.2. At ripple densities above 4/oct, the thresholds steeply increased up to 1.0 at densities of 7/oct. Based on the excitation-pattern model, the threshold increase at high ripple densities may be explained by integration within the passbands of the frequency-tuned filter. A threshold increase at low ripple densities cannot be explained by a simple bandpass filter model. The lowest spectrum contrast thresholds at intermediate ripple spacing indicate the presence of lateral suppression zones in the equivalent filter forms. According to th...

Lateral suppression enhances discrimination of comb-filtered signals