Context effects on second-language learning of tonal contrasts.

Studies of lexical tone  learning generally focus on monosyllabic contexts, while reports of phonetic learning benefits associated with input variability are based largely on experienced learners. This study trained inexperienced learners on Mandarin tonal contrasts to test two hypotheses regarding the influence of context and variability on tone  learning. The first hypothesis was that increased phonetic variability of tones in disyllabic contexts makes initial tone  learning more challenging in disyllabic than monosyllabic words. The second hypothesis was that the learnability of a given tone varies across contexts due to differences in tonal variability. Results of a word learning experiment supported both hypotheses: tones were acquired less successfully in disyllables than in monosyllables, and the relative difficulty of disyllables was closely related to contextual tonal variability. These results indicate limited relevance of monosyllable-based data on Mandarin learning for the disyllabic majority of the Mandarin lexicon. Furthermore, in the short term, variability can diminish learning; its effects are not necessarily beneficial but dependent on acquisition stage and other learner characteristics. These findings thus highlight the importance of considering contextual variability and the interaction between variability and type of learner in the design, interpretation, and application of research on phonetic learning

Phonetic complexity affects children’s Mandarin tone production accuracy in disyllabic words: A perceptual study

This is the first study to examine the effect of phonetic contexts on children’s lexical tone production. Mandarin tones in disyllabic words produced by forty-four 2- to 6-year-old children and twelve mothers were low-pass filtered to eliminate lexical information. Native Mandarin-speaking adults categorized the tones based on the pitch information in the filtered stimuli. All mothers’ tones were categorized with ceiling accuracy. Counter to the findings in most previous studies on children’s tone acquisition and the prevailing assumption in models of speech development that children acquire suprasegmental features much earlier than segmental features, this study found that children as old as six years of age have not mastered the production of Mandarin tones. Children’s tones were judged with significantly lower accuracy than mothers’ productions. Tone accuracy improved, while cross subject variability in tone accuracy decreased, with age. Children’s tone accuracy was affected by the articulatory complexity of phonetic contexts. Children made more errors in tone combinations with more complex fundamental frequency (F0) contours than tone sequences with simpler F0 changes. When producing disyllabic tone sequences with complex F0 contours, children tended to shift the F0 contour of the first tone to reduce the F0 change, resulting in more tone errors in the first syllable than in the second syllable and showing substantially more anticipatory coarticulation than adults. The results provide further evidence that acquisition of lexical tones is a protracted process in children. Tones produced accurately by children in one phonetic context may not be produced correctly in another phonetic context. Children demonstrate more anticipatory coarticulation in their disyllabic productions than adults, which may be attributed to children’s immature speech motor control in tone production, and is presumably a by-product of their inability to accomplish complex F0 changes within the syllable time-frame.published_or_final_versio

Strategies for analyzing tone languages

This paper outlines a method of auditory and acoustic analysis for determining the tonemes of a language starting from scratch, drawing on the author’s experience of recording and analyzing tone languages of north-east India. The methodology is applied to a preliminary analysis of tone in the Thang dialect of Khiamniungan, a virtually undocumented language of extreme eastern Nagaland and adjacent areas of the Sagaing Division Myanmar (Burma). Following a discussion of strategies for ensuring that data appropriate for tonal analysis will be recorded, the practical demonstration begins with a description of how tone categories can be established according to their syllable type in the preliminary auditory analysis. The paper then uses this data to describe a method of acoustic analysis that ultimately permits the representation of pitch shapes as a function of absolute mean duration. The analysis of grammatical tones, floating tones and tone sandhi are exemplified with Mongsen Ao data, and a description of a perception test demonstrates how this can be used to corroborate the auditory and acoustic analysis of a tone system. *This paper is in the series How to Study a Tone Language, edited by Steven Bird and Larry HymanNational Foreign Language Resource Cente

The unstressed syllable in English and Mandarin: a constrastive study.

Cheung Kwan Hin.Thesis (M.A.)--Chinese University of Hong Kong.Bibliography: leaves 90-93

Observing the contribution of both underlying and surface representations: Evidence from priming and event-related potentials

This dissertation aims to uncover the role of the acoustic input (the surface representation) and the abstract linguistic representation (the underlying representation) as listeners map the signal during spoken word recognition. To examine these issues, tone sandhi, a tonal alternation phenomenon in which a tone changes to a different tone in certain phonological environments, is investigated. This dissertation first examined how productive Mandarin tone 3 sandhi words (T3 → T2/___T3) are processed and represented. An auditory priming lexical decision experiment was conducted in which each disyllabic tone 3 sandhi target was preceded by a tone 2 monosyllable (surface-tone overlap), a tone 3 monosyllable (underlying-tone overlap), or an unrelated monosyllable (unrelated control). Lexical decision RTs showed a tone 3 (underlying-tone overlap) facilitation effect for both high and low frequency words. A second priming study investigated the processing and representation of the more complex and less productive Taiwanese tone sandhi. Lexical decision RTs, examining sandhi 24 → 33 and 51 → 55, showed that while both sandhi types exhibited facilitatory priming effects, underlying tone primes showed significantly more facilitation than surface primes for sandhi 24 → 33, while surface tone primes showed significantly more facilitation than underlying primes for sandhi 51 → 55, with both effects modulated by frequency. A third study used event-related potentials (ERPs) to examine Mandarin tone 3 sandhi. Using an oddball paradigm, participants passively listened to either Tone 2 standards ([tʂu2 je4] /tʂu2 je4/), Tone 3 standards ([tʂu3 je4] /tʂu3 je4/), Tone Sandhi standards ([tʂu2 jen3] /tʂu3 jen3/), or Mix standards (i.e., both tone 3 sandhi and tone 3 words), occasionally interspersed with a tone 2 word [tʂu2] (i.e., the deviant). Results showed a mismatch negativity (MMN) in the Tone 2 condition but not in the Sandhi condition, suggesting different neural processing mechanisms for Tone 2 and Sandhi words. Together, the current data suggest that the underlying tone contributes more to the processing of productive tone sandhi and the surface tone contributes more to the processing of less productive tone sandhi. In general, this dissertation provides evidence for the representation and processing of words that involve phonological alternation, both within the same language and across different languages

A challenge to whole-word phonology? : A study of Japanese and Mandarin

Phonological models of early word learning often assume that child forms can be understood as structural mappings from their adult targets. In contrast, the whole-word phonology model (Waterson, 1971, Ferguson & Farwell, 1975, Macken, 1979) suggests that on beginning word production children represent adult targets as holistic units, reflecting not the exact sound sequence but only the most perceptually salient elements or those that align with their own vocal patterns. Here we ask whether the predictions of the whole-word model are supported by data from children learning Japanese or Mandarin, both languages with phonotactic structures differing from any so far investigated from this perspective. The Japanese child word forms are found to include some characteristics suggestive of whole-word representation, but in Mandarin we find little or no such evidence. Instead, some children are found to make idiosyncratic use of whole syllables, substituting them for target syllables that they match in neither onset nor rime. This result, which neither model anticipates, forces reconsideration of a key tenet of the whole-word model — that early word production is based on word-size holistic representations; instead, at least in some languages, the syllable may serve as the basic representational unit for child learners

Development of Lexical Tone Production in Disyllabic Words by 2- to 6-year-old Mandarin-speaking Children

This study investigated children\u27s development in the production of Mandarin lexical tones in familiar disyllabic words and tested the hypothesis that disyllabic tone contours with more complex fundamental frequency contours are more difficult for children to produce. Participants were forty-four 2- to 6-year-old monolingual Mandarin-speaking children and 12 mothers. Their disyllabic tone productions were elicited by picture naming and low-pass filtered to eliminate lexical information while retaining the fundamental frequency contours. Three Mandarin-speaking judges listened to the filtered stimuli, and categorized the children\u27s and adult\u27s disyllabic tones. Acoustic analysis was performed on selected accurate child and adult productions and on a sample of children\u27s inaccurate productions. Judges identified adults\u27 productions as the intended tones with very high accuracy. As a group, children\u27s productions were judged significantly less correctly than adults\u27. Judged correctness increased significantly with age, but even 5- to 6-year-old children\u27s disyllabic tones were judged as less accurate overall than adults\u27. Large inter-subject variability was observed in 2- to 4-year-old children\u27s performance. Some disyllabic tones, particularly non-compatible tone combinations (i.e., tones with large transitions at the boundary between the syllables), remained difficult even for older children. When children made errors, they usually produced one of the tones correctly; error patterns suggested that they modified the first tone to be more compatible with the second tone (i.e., showed anticipatory coarticulation patterns), unlike the adult patterns which show more carry-over coarticulatory effects. When the four lexical tones were analyzed separately, significant context effects were found. Children produced the high level tone (T1) more accurately in the second than the first syllable. The rising tone (T2) was more accurately produced in compatible than non-compatible contexts. The low, dipping tone (T3) and falling tone (T4) were produced least accurately in the first syllable when the tone combination was non-compatible. In conclusion, acquisition of disyllabic Mandarin tone contour appears to be a gradual process that spans more than six years to achieve mastery. Children have more difficulty producing complex tone contours that demand rapid f0 changes, suggesting the influence of immature physiological control of laryngeal gestures on the production of lexical tone contours in continuous speech

SECOND LANGUAGE LEXICAL REPRESENTATION AND PROCESSING OF MANDARIN CHINESE TONES

This dissertation investigates second language (L2) speech learning challenges by testing advanced L2 Mandarin Chinese learners’ tone and word knowledge. We consider L2 speech learning under the scope of three general hypotheses. (1) The Tone Perception Hypothesis: Tones may be difficult for L2 listeners to perceive auditorily. (2) The Tone Representation Hypothesis: Tones may be difficult for L2 listeners to represent effectively. (3) The Tone Processing Hypothesis: Tones may be difficult for L2 listeners to process efficiently. Experiments 1 and 2 test tone perception and representation using tone identification tasks with monosyllabic and disyllabic stimuli with L1 and advanced L2 Mandarin listeners. Results suggest that both groups are highly accurate in identification of tones on isolated monosyllables; however, L2 learners have some difficulty in disyllabic contexts. This suggests that low-level auditory perception of tones presents L2 learners with persistent long-term challenges. Results also shed light on tone representations, showing that both L1 and L2 listeners are able to form abstract representations of third tone allotones. Experiments 3 and 4 test tone representation and processing through the use of online (behavioral and ERP) and offline measures of tone word recognition. Offline results suggest weaknesses in L2 learners’ long-term memory of tones for specific vocabulary. However, even when we consider only trials for which learners had correct and confident explicit knowledge of tones and words, we still see significant differences in accuracy for rejection of tone compared to vowel nonwords in lexical recognition tasks. Using a lexical decision task, ERP measures in Experiment 3 reveal consistent L1 sensitivity to tones and vowels in isolated word recognition, and individual differences among L2 listeners. While some are sensitive to both tone and vowel mismatches, others are only sensitive to vowels or not at all. Experiment 4 utilized picture cues to test neural responses tied directly to tone and vowel mismatches. Results suggest strong L1 sensitivity to vowel mismatches. No other significant results were found. The final chapter considers how the three hypotheses shed light on the results as a whole, and how they relate to the broader context of L2 speech learning

Lexical tones and morphotonology

Yongning Na, also known as Mosuo, is a Sino-Tibetan language spoken in Southwest China. This book provides a description and analysis of its tone system, progressing from lexical tones towards morphotonology. Tonal changes permeate numerous aspects of the morphosyntax of Yongning Na. They are not the product of a small set of phonological rules, but of a host of rules that are restricted to specific morphosyntactic contexts. Rich morphotonological systems have been reported in this area of Sino-Tibetan, but book-length descriptions remain few. This study of an endangered language contributes to a better understanding of the diversity of prosodic systems in East Asia. The analysis is based on original fieldwork data (made available online), collected over the course of ten years, commencing in 2006