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Journal Articles Journal of the Acoustical Society of America Year : 2011

Additivity of nonsimultaneous masking for short Gaussian-shaped sinusoids

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Bernhard Laback
  • Function : Author
  • PersonId : 867608
Peter Balazs
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  • PersonId : 866843
Thibaud Necciari
  • Function : Author
  • PersonId : 867609
Sophie Savel
Sølvi Ystad
Sabine Meunier
Richard Kronland-Martinet

Abstract

The additivity of nonsimultaneous masking was studied using Gaussian-shaped tone pulses (referred to as Gaussians) as masker and target stimuli. Combinations of up to four temporally separated Gaussian maskers with an equivalent rectangular bandwidth of 600 Hz and an equivalent rectangular duration of 1.7 ms were tested. Each masker was level-adjusted to produce approximately 8 dB of masking. Excess masking (exceeding linear additivity) was generally stronger than reported in the literature for longer maskers and comparable target levels. A model incorporating a compressive input/output function, followed by a linear summation stage, underestimated excess masking when using an input/output function derived from literature data for longer maskers and comparable target levels. The data could be predicted with a more compressive input/output function. Stronger com- pression may be explained by assuming that the Gaussian stimuli were too short to evoke the medial olivocochlear reflex (MOCR), whereas for longer maskers tested previously the MOCR caused reduced compression. Overall, the interpretation of the data suggests strong basilar membrane compression for very short stimuli.
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Dates and versions

hal-00541832 , version 1 (01-12-2010)

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Bernhard Laback, Peter Balazs, Thibaud Necciari, Sophie Savel, Sølvi Ystad, et al.. Additivity of nonsimultaneous masking for short Gaussian-shaped sinusoids. Journal of the Acoustical Society of America, 2011, 129 (2), pp.888-897. ⟨10.1121/1.3518781⟩. ⟨hal-00541832⟩
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