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Lexical knowledge boosts statistically-driven speech segmentation

Lookup NU author(s): Dr Laurence White

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This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).


Abstract

© 2018 The Author(s). The hypothesis that known words can serve as anchors for discovering new words in connected speech has computational and empirical support. However, evidence for how the bootstrapping effect of known words interacts with other mechanisms of lexical acquisition, such as statistical learning, is incomplete. In 3 experiments, we investigated the consequences of introducing a known word in an artificial language with no segmentation cues other than cross-syllable transitional probabilities. We started with an artificial language containing 4 trisyllabic novel words and observed standard above-chance performance in a subsequent recognition memory task. We then replaced 1 of the 4 novel words with a real word (tomorrow) and noted improved segmentation of the other 3 novel words. This improvement was maintained when the real word was a different length to the novel words (philosophy), ruling out an explanation based on metrical expectation. The improvement was also maintained when the word was added to the 4 original novel words rather than replacing 1 of them. Together, these results show that known words in an otherwise meaningless stream serve as anchors for discovering new words. In interpreting the results, we contrast a mechanism where the lexical boost is merely the consequence of attending to the edges of known words, with a mechanism where known words enhance sensitivity to transitional probabilities more generally.


Publication metadata

Author(s): Palmer SD, Hutson J, White L, Mattys SL

Publication type: Article

Publication status: Published

Journal: Journal of Experimental Psychology: Learning Memory and Cognition

Year: 2019

Volume: 45

Issue: 1

Pages: 139-146

Print publication date: 01/01/2019

Online publication date: 28/06/2018

Acceptance date: 14/01/2018

ISSN (print): 0278-7393

ISSN (electronic): 1939-1285

Publisher: American Psychological Association

URL: https://doi.org/10.1037/xlm0000567

DOI: 10.1037/xlm0000567

PubMed id: 29952630


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