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Auditory stream segregation using amplitude modulated bandpass noise.

Yingjiu Nie¹, Peggy B Nelson²

¹Department of Communication Sciences and Disorders, James Madison University Harrisonburg, VA, USA.

Frontiers in Psychology

|August 25, 2015

Summary

Listeners can better segregate auditory streams using spectral separation and amplitude modulation (AM) rate differences. Spectral cues enhance segregation over time, while AM rate acts as a secondary cue, especially with spectral overlap.

Keywords:

amplitude modulation auditory scene analysis auditory stream segregation auditory streaming bandpass noise build-up segregation cochlear implant simulations sequential grouping

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Area of Science:

Auditory perception
Psychoacoustics
Signal processing

Background:

Auditory stream segregation is crucial for understanding complex sound environments.
Spectral overlap and amplitude modulation (AM) rate are key acoustic cues influencing segregation.
The build-up effect describes improved segregation with prolonged listening.

Purpose of the Study:

To investigate the roles of spectral overlap and AM rate in auditory stream segregation for noise signals.
To examine the build-up effect for segregation based on spectral and AM rate differences.
To determine how spectral and AM rate differences interact to influence segregation.

Main Methods:

An objective listening paradigm was used to assess segregation ability.
Stimuli consisted of two interleaved bandpass noise streams (A and B) varying in spectral content and/or AM rate.
The magnitude of spectral and AM rate differences, as well as sequence duration (long/short), were systematically manipulated.

Main Results:

Segregation ability increased with greater spectral separation and larger AM rate separations.
Spectral separation elicited a build-up effect, improving segregation with prolonged listening.
AM rate separation interacted with spectral separation, suggesting an additive effect on segregation build-up.

Conclusions:

Normal-hearing listeners can segregate auditory streams using reduced spectral contrast cues, especially with attention focused on segregation.
AM rate serves as a secondary cue for segregation, particularly when spectral overlap is present.
Spectral differences drive a build-up effect in segregation, while AM rate differences contribute to build-up primarily when combined with spectral cues.