Abstract
In psychophysical experiments, cochlear compression function can be derived by comparison of on- and off-frequency masking, assuming that in the signal representation, the responses to both the signal and on-frequency masker are equally compressed whereas the response to the off-frequency masker is not compressed. In the present study, this approach was used to assess the influence of compression on discrimination of complex signal spectra. The signal was rippled noise, 0.5-oct wide, centered at 2 kHz, 40 to 90 dB SPL. Ripple-density discrimination limit was measured using the ripple-phase reversal test. Simultaneous maskers were 0.5-oct wide noise centered either at the signal frequency (on-frequency) or 0.75 oct below the signal (off-frequency). Masker level increase resulted in decrease of ripple-density discrimination limit. The growth of the on-frequency masker was approximately 1:1. The growth of the off-frequency masking was close to 1:1 at signal levels below 50 dB and 5:1 at signal levels above 60 dB SPL. The results indicate compression of the ripple-pattern signal by approximately 1:5. The observed manifestation of compression implies that the rippled-spectrum discrimination is little susceptible to lateral suppression and off-frequency listening. [Work supported by Russian Science Foundation.]
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