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Perceptual learning and generalization resulting from training on an auditory amplitude-modulation detection task.

Matthew B Fitzgerald¹, Beverly A Wright

¹Department of Otolaryngology, New York University School of Medicine, 550 First Avenue, NBV-5E5, New York, New York 10016, USA. matthew.fitzgerald@nyumc.org

The Journal of the Acoustical Society of America

|March 3, 2011

Summary

Practice improves the detection of sound amplitude modulation (SAM). However, this learning shows limited generalization to untrained sound characteristics or tasks, suggesting specific auditory skill development.

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Area of Science:

Auditory Neuroscience
Psychoacoustics
Human Perception

Background:

Amplitude modulation (AM) detection is crucial for understanding speech and other complex sounds.
Investigating the plasticity of auditory perception, specifically AM detection, is important for understanding auditory learning.

Purpose of the Study:

To determine if practice can improve the ability to detect sinusoidal amplitude modulation (SAM).
To assess the generalization of this learned skill to untrained auditory conditions and tasks.

Main Methods:

Normal-hearing adults were trained on SAM detection for 6-7 days.
Performance was tested before and after training on trained and untrained SAM detection and rate discrimination tasks.
A control group only underwent pre- and post-testing.

Main Results:

Trained listeners showed significant improvement in SAM detection compared to controls.
Individual learning rates varied, with some reaching peak performance in 1 session and others in 4-6 sessions.
Learning did not generalize to untrained carrier spectra or rate discrimination, but showed some generalization to untrained modulation rates.

Conclusions:

Practice enhances the detection of amplitude modulation in auditory signals.
Auditory learning through practice is specific, with limited generalization to untrained acoustic parameters or tasks.