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On- and off-frequency forward masking by Schroeder-phase complexes.

Magdalena Wojtczak¹, Andrew J Oxenham

¹Department of Psychology, University of Minnesota, 75 East River Rd, Minneapolis, MN, 55455, USA. wojtc001@umn.edu

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Summary

Forward masking in human hearing is influenced by masker phase curvature. Efferent activation may explain unexpected spectro-temporal masking effects at higher frequencies.

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Area of Science:

Auditory Neuroscience
Psychoacoustics
Human Hearing

Background:

Forward masking is a key phenomenon in auditory perception.
Masker phase curvature and duration influence auditory filtering.
Peripheral auditory processing involves amplitude compression.

Purpose of the Study:

Investigate the impact of masker phase curvature on forward masking.
Examine effects across different signal frequencies and masker durations.
Explore potential mechanisms underlying spectro-temporal masking effects.

Main Methods:

Measured forward masking using harmonic tone complexes.
Varied masker phase curvature and duration (30 ms, 200 ms).
Tested on- and off-frequency maskers for signal frequencies of 1, 2, and 6 kHz.

Main Results:

Results matched predictions at 1 kHz based on peripheral filtering.
Deviations from predictions observed at 2 and 6 kHz.
Masker duration amplified phase curvature effects; off-frequency maskers showed effects at 6 kHz.

Conclusions:

Peripheral auditory filtering alone cannot explain all observed masking effects.
Medial olivocochlear efferent activation is a potential mechanism.
Efferent pathways may contribute to spectro-temporal masking in human hearing.