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Related Experiment Video

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The Measurement and Treatment of Suppression in Amblyopia

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Negative masking and the units problem in audition.

Daniel Shepherd¹, Michael J Hautus

¹Department of Psychology, The University of Auckland, Private Bag 92019, Auckland, New Zealand.

Hearing Research

|November 19, 2008

Summary

Negative masking, where sound stimuli appear quieter, occurred in experiments defining stimuli by amplitude. This effect was most pronounced for higher frequencies, suggesting amplitude-based definitions impact auditory perception.

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Area of Science:

Auditory perception
Psychoacoustics
Sensory neuroscience

Background:

Masking functions, used to determine auditory thresholds, can paradoxically show negative masking.
This phenomenon is particularly noted when sound stimuli are defined by amplitude (pressure) rather than intensity.

Purpose of the Study:

To investigate negative masking in auditory perception.
To compare the efficacy of transduction and sensory analytic models in explaining these findings.

Main Methods:

Experiments used 10-ms tones (1000 Hz and 6500 Hz) in quiet and noise, defining stimuli by amplitude.
Two computational models, transduction and sensory analytic, were applied to the experimental data.
Goodness-of-fit was assessed using maximum likelihood estimates, with model complexity adjusted by AIC and BIC.

Main Results:

Negative masking was observed across experimental conditions when stimuli were defined by amplitude.
The greatest degree of negative masking occurred with 6500-Hz tones.
Both models explained the data, but the sensory analytic model offered superior fits and physiological relevance.

Conclusions:

Stimulus definition by amplitude can lead to negative masking effects in auditory perception.
The sensory analytic model provides a better explanation for negative masking phenomena, aligning with physiological processes.