Dichotic integration of acoustic-phonetic information: Competition from extraneous formants increases the effect of second-formant attenuation on intelligibility

Roberts, Brian and Summers, Robert J (2019). Dichotic integration of acoustic-phonetic information: Competition from extraneous formants increases the effect of second-formant attenuation on intelligibility. Journal of the Acoustical Society of America, 145 (3), pp. 1230-1240.

Abstract

Differences in ear of presentation and level do not prevent effective integration of concurrent speech cues such as formant frequencies. For example, presenting the higher formants of a consonant-vowel syllable in the opposite ear to the first formant protects them from upward spread of masking, allowing them to remain effective speech cues even after substantial attenuation. This study used three-formant (F1+F2+F3) analogues of natural sentences and extended the approach to include competitive conditions. Target formants were presented dichotically (F1+F3; F2), either alone or accompanied by an extraneous competitor for F2 (i.e., F1±F2C+F3; F2) that listeners must reject to optimize recognition. F2C was created by inverting the F2 frequency contour and using the F2 amplitude contour without attenuation. In experiment 1, F2C was always absent and intelligibility was unaffected until F2 attenuation exceeded 30 dB; F2 still provided useful information at 48-dB attenuation. In experiment 2, attenuating F2 by 24 dB caused considerable loss of intelligibility when F2C was present, but had no effect in its absence. Factors likely to contribute to this interaction include informational masking from F2C acting to swamp the acoustic-phonetic information carried by F2, and interaural inhibition from F2C acting to reduce the effective level of F2.

Publication DOI: https://doi.org/10.1121/1.5091443
Dataset DOI: https://doi.org/10.17036/researchdata.aston.ac.uk.00000396
Divisions: Life & Health Sciences > Clinical and Systems Neuroscience
Life & Health Sciences > Vision, Hearing and Language
Life & Health Sciences > Centre for Vision and Hearing Research
Life & Health Sciences > Psychology
Additional Information: © 2019 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). Funding: ESRC ES/N014383/1.
Uncontrolled Keywords: Arts and Humanities (miscellaneous),Acoustics and Ultrasonics
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Related URLs: https://asa.sci ... .1121/1.5091443 (Publisher URL)
http://www.scop ... tnerID=8YFLogxK (Scopus URL)
Accepted Date: 2019-02-01
Published Online Date: 2019-03-06
Authors: Roberts, Brian ( 0000-0002-4232-9459)
Summers, Robert J ( 0000-0003-4857-7354)

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