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Forward masking of amplitude modulation across ears and its tuning in the modulation domain

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posted on 22.03.2021, 11:34 by Christian Fullgrabe, Aleksander Sęk, Brian CJ Moore
Frequency selectivity in the amplitude modulation (AM) domain has been demonstrated using both simultaneous AM masking and forward AM masking. This has been explained using the concept of a modulation filter bank (MFB). Here, we assessed whether the MFB occurs before or after the point of binaural interaction in the auditory pathway by using forward masking in the AM domain in an ipsilateral condition (masker AM and signal AM applied to the left ear with an unmodulated carrier in the right ear) and a contralateral condition (masker AM applied to the right ear and signal AM applied to the left ear). The carrier frequency was 8 kHz, the signal AM frequency, fs, was 40 or 80 Hz, and the masker AM frequency ranged from 0.25 to 4 times fs. Contralateral forward AM masking did occur, but it was smaller than ipsilateral AM masking. Tuning in the AM domain was slightly sharper for ipsilateral than for contralateral masking, perhaps reflecting confusion of the signal and masker AM in the ipsilateral condition when their AM frequencies were the same. The results suggest that there might be an MFB both before and after the point in the auditory pathway where binaural interaction occurs.

Funding

EU Marie Curie Fellowship

Wolfson College (Cambridge, UK) Junior Research Fellowship

MRC grant

Deafness Research UK

History

School

  • Sport, Exercise and Health Sciences

Published in

The Journal of the Acoustical Society of America

Volume

149

Issue

3

Pages

1764 - 1771

Publisher

Acoustical Society of America (ASA)

Version

AM (Accepted Manuscript)

Rights holder

© Acoustical Society of America

Publisher statement

Copyright (2021) Acoustical Society of America. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the Acoustical Society of America. The following article appeared in The Journal of the Acoustical Society of America, 149 (3), pp.1764-1771 (2021); doi: 10.1121/10.0003598 and may be found at https://asa.scitation.org/doi/10.1121/10.0003598.

Acceptance date

08/02/2021

Publication date

2021-03-12

Copyright date

2021

ISSN

0001-4966

Language

en

Depositor

Dr Christian Fullgrabe. Deposit date: 18 March 2021

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