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A Two-interval Forced-choice Task for Multisensory Comparisons

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The auditory continuity illusion: a parametric investigation and filter model.

Lars Riecke¹, A John Van Orstal, Elia Formisano

¹Department of Cognitive Neuroscience, University of Maastricht, Maastricht, The Netherlands. l.riecke@psychology.unimaas.nl

Perception & Psychophysics

|March 1, 2008

Summary

The auditory continuity illusion, where noise bridges a silent gap, depends on noise characteristics. This study quantifies how noise duration, power, and bandwidth influence this perception, revealing constraints on auditory processing.

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Area of Science:

Auditory perception
Psychoacoustics
Signal processing

Background:

A silent gap in sound typically leads to a perception of discontinuity.
However, introducing noise within the gap can create an auditory continuity illusion, making the sound seem continuous.
The precise mechanisms and quantitative relationships governing this illusion, particularly the role of noise masking, require thorough investigation.

Purpose of the Study:

To systematically quantify the relationship between perceived auditory continuity and the parameters of interrupting broadband noise (duration, relative power, notch width).
To estimate the range of noise parameters that induce auditory grouping and the continuity illusion.
To apply a power spectrum model to explain the results and estimate the auditory filter's critical bandwidth involved in the illusion.

Main Methods:

Systematic quantification of perceived continuity using amplitude-modulated tones at various frequencies, interrupted by noise.
Fitting psychometric functions to estimate noise parameter ranges for auditory grouping.
Application of a power spectrum model to masking data and estimation of critical bandwidth.

Main Results:

The study establishes quantitative relationships between noise parameters (duration, relative power, notch width) and the perception of auditory continuity.
Psychometric fitting identified specific ranges of noise parameters that effectively induce auditory grouping.
A power spectrum model was applied, yielding estimates for the critical bandwidth of the auditory filter implicated in the continuity illusion.

Conclusions:

The findings provide constraints on the spectral resolution of mechanisms underlying the auditory continuity illusion.
The study offers a valuable stimulus set for future neurophysiological investigations into the neural correlates of auditory continuity.