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Investigating Whether Discriminability Predicts Lexical Encoding Accuracy for American English Learners of Phonemic Length in Second Language Japanese.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Investigating Whether Discriminability Predicts Lexical Encoding Accuracy for American English Learners of Phonemic Length in Second Language Japanese./
Author:	Lidster, Ryan.
Description:	1 online resource (287 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 84-12, Section: A.
Contained By:	Dissertations Abstracts International84-12A.
Subject:	Linguistics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30526100click for full text (PQDT)
ISBN:	9798379713591

Investigating Whether Discriminability Predicts Lexical Encoding Accuracy for American English Learners of Phonemic Length in Second Language Japanese.
Lidster, Ryan.

Investigating Whether Discriminability Predicts Lexical Encoding Accuracy for American English Learners of Phonemic Length in Second Language Japanese. - 1 online resource (287 pages)

Source: Dissertations Abstracts International, Volume: 84-12, Section: A.

Thesis (Ph.D.)--Indiana University, 2023.

Includes bibliographical references

When acquiring a second language, learners must become able to perceive the difference between novel sounds ("discrimination") and also associate strings of sounds with distinct vocabulary items ("lexical encoding"). Recent research has questioned whether discrimination is a sufficient or necessary condition for encoding, and Japanese length is of particular relevance to this question because of the large number of contrasts distinguished primarily by duration. For example, koko, kooko, kokko, kokoo, kookoo, and kokkoo are six distinct, unrelated nouns, and while previous studies have shown that learners are able to detect differences between at least some forms, length-related errors in word recognition and production remain highly frequent, even for advanced learners. Therefore, modeling these error patterns is of key interest to teachers and researchers, but current models of L2 perception do not yet account for phonemic length.This study examines the performance of 30 American English-speaking learners of Japanese and 10 native speakers on an Oddity discrimination task, two lexical encoding tasks (picture-word matching and forced-choice lexical decision), and a Free Classification and Identification task to model patterns of confusion across a variety of length-related contrasts. For discrimination, vowel contrasts in initial position were easier than consonant length contrasts, and Free Classification and Identification results patterned very closely with discrimination performance, showing that these tasks are viable for modeling discriminability, even for non-segmental features. For lexical encoding, the most difficult contrasts in discrimination were similarly at near chance levels for lexical encoding, suggesting that a baseline level of discrimination is needed. Overall, there were moderate, significant correlations between discrimination and lexical encoding tasks, but the encoding tasks were much more closely related to each other than to discrimination, providing convergent and divergent evidence that the two constructs are measurably separable. For encoding, non-word competitors of the "all-short" form were much more difficult to reject compared to stimuli that had spurious long segments. These results line up with previous research on other languages to show how lexical encoding is hierarchical. In sum, the results support the interpretation that lexical encoding, while related to discrimination, is a separable construct.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9798379713591Subjects--Topical Terms:

524476
Linguistics.
Subjects--Index Terms:

DiscriminationIndex Terms--Genre/Form:

542853
Electronic books.

Investigating Whether Discriminability Predicts Lexical Encoding Accuracy for American English Learners of Phonemic Length in Second Language Japanese.
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502 $a Thesis (Ph.D.)--Indiana University, 2023.
504 $a Includes bibliographical references
520 $a When acquiring a second language, learners must become able to perceive the difference between novel sounds ("discrimination") and also associate strings of sounds with distinct vocabulary items ("lexical encoding"). Recent research has questioned whether discrimination is a sufficient or necessary condition for encoding, and Japanese length is of particular relevance to this question because of the large number of contrasts distinguished primarily by duration. For example, koko, kooko, kokko, kokoo, kookoo, and kokkoo are six distinct, unrelated nouns, and while previous studies have shown that learners are able to detect differences between at least some forms, length-related errors in word recognition and production remain highly frequent, even for advanced learners. Therefore, modeling these error patterns is of key interest to teachers and researchers, but current models of L2 perception do not yet account for phonemic length.This study examines the performance of 30 American English-speaking learners of Japanese and 10 native speakers on an Oddity discrimination task, two lexical encoding tasks (picture-word matching and forced-choice lexical decision), and a Free Classification and Identification task to model patterns of confusion across a variety of length-related contrasts. For discrimination, vowel contrasts in initial position were easier than consonant length contrasts, and Free Classification and Identification results patterned very closely with discrimination performance, showing that these tasks are viable for modeling discriminability, even for non-segmental features. For lexical encoding, the most difficult contrasts in discrimination were similarly at near chance levels for lexical encoding, suggesting that a baseline level of discrimination is needed. Overall, there were moderate, significant correlations between discrimination and lexical encoding tasks, but the encoding tasks were much more closely related to each other than to discrimination, providing convergent and divergent evidence that the two constructs are measurably separable. For encoding, non-word competitors of the "all-short" form were much more difficult to reject compared to stimuli that had spurious long segments. These results line up with previous research on other languages to show how lexical encoding is hierarchical. In sum, the results support the interpretation that lexical encoding, while related to discrimination, is a separable construct.
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