• 1990 (Vol.4)
  • 1989 (Vol.3)
  • 1988 (Vol.2)
  • 1987 (Vol.1)

Volume 32 #2

Contents

  1. Tinnitus – contemporary knowledge about its origin, electrophysiological correlates and treatment
  2. Eye optics and retinal topography in the nutria (Myocastor coypus)
  3. Quantitative study of Poggendorff illusion in school children with normal binocular vision and with strabismus
  4. The method of canine odor visualization
  5. Precopulatory mechanisms of reproductive isolation between two chromosomal forms of striped hamsters Cricetulus barabensis sensu lato (Rodentia, Cricetinae)
  6. Discrimination of sound signals with rippled spectra in on- and low-frequency noise: contribution of compressive nonlinearity and confounding issues
  7. The equivalent frequency-tuned filter form for discrimination of spectral pattern of sound signals: Contribution of the lateral suppression and harmonics

Discrimination of sound signals with rippled spectra in on- and low-frequency noise: contribution of compressive nonlinearity and confounding issues

© 2018 O.N. Milekhina, D.I. Nechaev, A.Ya. Supin

Institute of Ecology and Evolution of RAS 119071 Moscow, Leninsky prospect,33

Received 20 Jul 2017

Rippled-spectrum discrimination in simultaneous noise was investigated. The signal was band-limited (0.5 oct at a –6-dB level) rippled noise centered at 2 kHz, with a ripple density of 3.5 oct–1. The ripple pattern discrimination was assessed using a ripple phase reversal test. The noise (masker) was band-limited nonrippled noise centered at either 2 kHz (on-frequency masker) or 1 kHz (low-frequency masker). The masker was simultaneously presented with the signal. Masker levels at threshold were measured as a function of the signal level using the adaptive (staircase) two- alternative forced-choice procedure. For the on-frequency masker, the searched-for function had a slope of 0.98 dB/dB. For the low-frequency masker, the function had a slope of 1.19 dB/dB within a signal level range of 30 to 40 dB SPL and as low as 0.15 dB/dB within a signal level range of 70 to 80 dB SPL. These results were interpreted as indicating compression of responses to both the signal and on-frequency masker and no compression of the effect of the low- frequency masker. The possible roles of confounding effects (the lateral suppression and off-frequency listening) are considered. In conditions when above-threshold signals are discriminated in simultaneous noise (the masker), cochlear compression manifests to a substantial degree.

Key words: hearing, compression, masking, rippled noise

DOI: 10.7868/S0235009218020063

Cite: Milekhina O. N., Nechaev D. I., Supin A. Ya. Razlichenie zvukovykh signalov s grebenchatymi spektrami na fone izochastotnogo i nizkochastotnogo shumov: rol kompressivnoi nelineinosti i soputstvuyushchikh faktorov [Discrimination of sound signals with rippled spectra in on- and low-frequency noise: contribution of compressive nonlinearity and confounding issues]. Sensornye sistemy [Sensory systems]. 2018. V. 32(2). P. 161-168 (in Russian). doi: 10.7868/S0235009218020063

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