Listeners parse the speech signal effortlessly into words and phrases, but many questions remain about how. One classic idea is that rhythm-related auditory principles play a role, in particular, that a psycho-acoustic “iambic-trochaic law” (ITL) ensures that alternating sounds varying in intensity are perceived as recurrent binary groups with initial prominence (trochees), while alternating sounds varying in duration are perceived as binary groups with final prominence (iambs). We test the hypothesis that the ITL is in fact an indirect consequence of the parsing of speech along two in-principle orthogonal dimensions: prominence and grouping. Results from several perception experiments show that the two dimensions, prominence and grouping, are each reliably cued by both intensity and duration, while foot type is not associated with consistent cues. The ITL emerges only when one manipulates either intensity or duration in an extreme way. Overall, the results suggest that foot perception is derivative of the cognitively more basic decisions of grouping and prominence, and the notions of trochee and iamb may not play any direct role in speech parsing. A task manipulation furthermore gives new insight into how these decisions mutually inform each other.
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February 2023
February 13 2023
The iambic-trochaic law without iambs or trochees: Parsing speech for grouping and prominencea)
Special Collection:
Reconsidering Classic Ideas in Speech Communication
Esmail Moghiseh;
Esmail Moghiseh
b)
Department of Linguistics, McGill University
, Montréal, Québec H3A 1A7, Canada
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Morgan Sonderegger
;
Morgan Sonderegger
b)
Department of Linguistics, McGill University
, Montréal, Québec H3A 1A7, Canada
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Michael Wagner
Michael Wagner
Department of Linguistics, McGill University
, Montréal, Québec H3A 1A7, Canada
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b)
Also at: Centre for Research on Brain, Language, and Music, McGill University, Montreal, Quebec H3G 2A8, Canada.
c)
Electronic mail: chael@mcgill.ca
a)
This paper is part of a special issue on Reconsidering Classic Ideas in Speech Communication.
J. Acoust. Soc. Am. 153, 1108–1129 (2023)
Article history
Received:
April 19 2022
Accepted:
January 23 2023
Citation
Esmail Moghiseh, Morgan Sonderegger, Michael Wagner; The iambic-trochaic law without iambs or trochees: Parsing speech for grouping and prominence. J. Acoust. Soc. Am. 1 February 2023; 153 (2): 1108–1129. https://doi.org/10.1121/10.0017170
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