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Decision rules in detection of simple and complex tones.

S Buus, E Schorer, M Florentine

The Journal of the Acoustical Society of America

|December 1, 1986

Summary

Listeners can better detect simple and complex tones when multiple auditory channels are active. This study explored tone detection in masking noise, finding that simultaneous signal energy aids hearing perception.

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Area of Science:

Auditory perception
Psychoacoustics
Signal detection theory

Background:

Understanding auditory masking is crucial for diagnosing hearing impairments.
Previous research has investigated the detection of pure tones in noise.

Purpose of the Study:

To examine the detection of simple and complex tones in the presence of broadband masking noise.
To compare the masked thresholds for pure tones versus multi-component complex tones.
To evaluate the efficacy of a multiband energy-detector model in explaining the results.

Main Methods:

Two experiments were conducted using a two-interval, two-alternative forced-choice (2I, 2AFC) task.
Listeners detected pure tones (220, 1100, 3850 Hz) or an 18-tone complex (110–7260 Hz) in 64-dB SPL masking noise.
Psychometric functions were obtained to determine masked thresholds.

Main Results:

Masked thresholds for pure tones were consistently 43–44 dB SPL, while the complex tone's threshold was approximately 37 dB SPL per component.
In experiment 2, thresholds increased to 46 dB for pure tones and 40.5 dB for the complex tone.
Results suggest that utilizing multiple auditory channels enhances tone detection, with listeners potentially summing decision variables across selected channels.

Conclusions:

The simultaneous presence of signal energy across multiple auditory channels significantly aids in tone detection.
Findings provide partial support for a multiband energy-detector model, indicating listeners may employ an optimized channel selection strategy.
Further research is needed to refine auditory detection models and understand how listeners integrate information across auditory channels.

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