Acquisition of L2 Japanese geminates: Training with waveform displays

The value of waveform displays as visual feedback was explored in a training study involving perception and production of L2 Japanese by beginning-level L1 English learners. A pretest-posttest design compared auditory-visual (AV) and auditory-only (A-only) Web-based training. Stimuli were singleton and geminate /t,k,s/ followed by /a,u/ in two conditions (isolated words, carrier sentences). Fillers with long vowels were included. Participants completed a forced-choice identification task involving minimal triplets: singletons, geminates, long vowels (e.g., sasu, sassu, saasu). Results revealed a) significant improvement in geminate identification following training, especially for AV; b) significant effect of geminate (lowest scores for /s/); c) no significant effect of condition; and d) no significant improvement for the control group. Most errors were misperceptions of geminates as long vowels. Test of generalization revealed 5% decline in accuracy for AV and 14% for A-only. Geminate production improved significantly (especially for AV) based on rater judgments; improvement was greatest for /k/ and smallest for /s/. Most production errors involved substitution of a singleton for a geminate. Post-study interviews produced positive comments on Web-based training. Waveforms increased awareness of durational differences. Results support the effectiveness of auditory-visual input in L2 perception training with transfer to novel stimuli and improved production

Acquisition of Japanese quantity contrasts by L1 Cantonese speakers

This paper explores the acquisition of Japanese vowel and consonant quantity contrasts by Cantonese learners. Our goal is to examine whether transfer from L1 is possible when L1 experience is phonemic but restricted to a small set of sounds (short vs. long vowels) and when the experience is non-phonemic, derived only at morpheme boundaries (short vs. long consonants). We recruited 20 Cantonese learners (beginner and advanced learners) and 5 native speakers of Japanese, who produced target stimuli varying in consonant and vowel quantity framed in a carrier sentence. The resultant data were converted into several durational ratios for analyses. Results showed that both the beginners and advanced learners were able to distinguish between short vs. long vowels and consonants in Japanese, but only the native speakers enhanced the contrasts in slower speech. It was also found that in most cases the learners were able to lengthen the vowel before a geminate (i.e. long consonant), a secondary cue to Japanese consonant quantity known to be rare across languages. These results are discussed in terms of current theories of second language acquisition.postprin

Perceptual characteristics and learning of Japanese phonemic length contrast by non-native listeners

制度:新 ; 報告番号:甲3515号 ; 学位の種類:博士(国際情報通信学) ; 授与年月日:2012/2/8 ; 早大学位記番号:新585

L2 Learners' Perception of Long Vowels and Geminates in Japanese Dialects

Learners of Japanese are well known to have difficulties acquiring geminates and long vowels. What affects the perception of these has yet to be determined, with various studies coming to different conclusions about what cue learners use. In addition to these more difficult phonological features of the language, Japanese has a few different dialects that may play an additional role in perception. This study focuses on the Standard Japanese, Okinawa, and Kansai dialects. Participants completed two tasks in addition to a background questionnaire. The main task in this experiment required participants to transcribe nonwords that they heard in Hiragana. The nonwords included either a long vowel, geminate, or their minimal pairs which were short vowels and singletons, respectively. Results were analyzed in R through mixed-effects logistic regressions. The results from the main task found that perceptual accuracy dropped when learners transcribed words containing long vowels, however the dialect in which they heard the long vowels did not cause a difference in perception. In terms of geminates, participants did not perform significantly different between geminates and singletons, but similar to the results for long vowels, participants were found not to perform differently due to any of the dialects

The production and perception of peripheral geminate/singleton coronal stop contrasts in Arabic

Gemination is typologically common word-medially but is rare at the periphery of the word (word-initially and -finally). In line with this observation, prior research on production and perception of gemination has focused primarily on medial gemination. Much less is known about the production and perception of peripheral gemination. This PhD thesis reports on comprehensive articulatory, acoustic and perceptual investigations of geminate-singleton contrasts according to the position of the contrast in the word and in the utterance. The production component of the project investigated the articulatory and acoustic features of medial and peripheral gemination of voiced and voiceless coronal stops in Modern standard Arabic and regional Arabic vernacular dialects, as produced by speakers from two disparate and geographically distant countries, Morocco and Lebanon. The perceptual experiment investigated how standard and dialectal Arabic gemination contrasts in each word position were categorised and discriminated by three groups of non-native listeners, each differing in their native language experience with gemination at different word positions. The first experiment used ultrasound and acoustic recordings to address the extent to which word-initial gemination in Moroccan and Lebanese dialectal Arabic is maintained, as well as the articulatory and acoustic variability of the contrast according to the position of the gemination contrast in the utterance (initial vs. medial) and between the two dialects. The second experiment compared the production of word-medial and -final gemination in Modern Standard Arabic as produced by Moroccan and Lebanese speakers. The aim of the perceptual experiment was to disentangle the contribution of phonological and phonetic effects of the listeners’ native languages on the categorisation and discrimination of non-lexical Moroccan gemination by three groups of non-native listeners varying in their phonological (native Lebanese group and heritage Lebanese group, for whom Moroccan is unintelligible, i.e., non-native language) and phonetic-only (native English group) experience with gemination across the three word positions. The findings in this thesis constitute important contributions about positional and dialectal effects on the production and perception of gemination contrasts, going beyond medial gemination (which was mainly included as control) and illuminating in particular the typologically rare peripheral gemination

THE PRODUCTION OF ARABIC GEMINATE STOPS BY ENGLISH LEARNERS OF ARABIC

This study aims to investigate the developmental ability of beginning and advance L1 English learners of Arabic to pronounce standard Arabic geminate consonants when enrolled in a full time L2 program. The results showed that English learners produced shorter closure duration when pronouncing geminates. In particular, the beginners lengthened singletons more than the advanced learners did, while both groups of learners shortened geminates much more so than native speakers of Arabic. The advanced L1 English learners of Arabic produced longer geminate duration than beginners. The ultimate result was a smaller ratio between singleton and geminate consonants in comparison to native speakers of Arabic