Across-formant integration and speech intelligibility:effects of acoustic source properties in the presence and absence of a contralateral interferer

Summers, Robert J., Bailey, Peter J. and Roberts, Brian (2016). Across-formant integration and speech intelligibility:effects of acoustic source properties in the presence and absence of a contralateral interferer. Journal of the Acoustical Society of America, 140 (2), pp. 1227-1238.

Abstract

The role of source properties in across-formant integration was explored using three-formant (F1+F2+F3) analogues of natural sentences (targets). In experiment 1, F1+F3 were harmonic analogues (H1+H3) generated using a monotonous buzz source and second-order resonators; in experiment 2, F1+F3 were tonal analogues (T1+T3). F2 could take either form (H2 or T2). Target formants were always presented monaurally; the receiving ear was assigned randomly on each trial. In some conditions, only the target was present; in others, a competitor for F2 (F2C) was presented contralaterally. Buzz-excited or tonal competitors were created using the time-reversed frequency and amplitude contours of F2. Listeners must reject F2C to optimize keyword recognition. Whether or not a competitor was present, there was no effect of source mismatch between F1+F3 and F2. The impact of adding F2C was modest when it was tonal but large when it was harmonic, irrespective of whether F2C matched F1+F3. This pattern was maintained when harmonic and tonal counterparts were loudness-matched (experiment 3). Source type and competition, rather than acoustic similarity, governed the phonetic contribution of a formant. Contrary to earlier research using dichotic targets, requiring across-ear integration to optimize intelligibility, H2C was an equally effective informational masker for H2 as for T2.

Publication DOI: https://doi.org/10.1121/1.4960595
Dataset DOI: https://doi.org/10.17036/832e5972-0344-4ae5-b38c-0ff066de3a5f
Divisions: Life & Health Sciences > Psychology
Additional Information: © 2016 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/K004905/1
Uncontrolled Keywords: Arts and Humanities (miscellaneous),Acoustics and Ultrasonics
Full Text Link: http://link.aip ... /?JAS/140/1227/
Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
Published Date: 2016-08
Authors: Summers, Robert J. ( 0000-0003-4857-7354)
Bailey, Peter J.
Roberts, Brian ( 0000-0002-4232-9459)

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License: Creative Commons Attribution


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