Auditory filter asymmetry at 2000 Hz in 80 normal-hearing ears.

Auditory filter asymmetry, bandwidth, dynamic range, and efficiency was measured at 2000 Hz in both ears of 40 naive, normal-hearing adults, counterbalanced for sex and initial ear tested. The filters were measured with 200-ms tonal signals temporally centered in 300-ms maskers. The maskers were notched noises presented at a spectrum level of 40 dB SPL. Quiet thresholds for the signal were also obtained. The distributions of the measured variables and correlations between them are reported. The average filter was nearly symmetric but the most common filters had steeper upper slopes. The shapes of the two sides of the filter were independent. Filter asymmetry was not correlated with the equivalent rectangular bandwidth (ERB), and quiet threshold was not consistently correlated with the dynamic range of the filter or with ERB. The mean ERB was 255 Hz.