Papers by Masako Fujimoto
HAL (Le Centre pour la Communication Scientifique Directe), Dec 7, 2020
Using the verbal transformation effect, the preliminary investigation focused on the function and... more Using the verbal transformation effect, the preliminary investigation focused on the function and the capacity of auditory short-term/working memory. The verbal transformation effect is the phenomenon in which a person hears a repeated single word without pauses, and illusory changes (perceptual transition) of the physically unchanging word are induced. The absence of a pause between words generally causes the verbal transformation effect. However, through this study, it has become evident that the verbal transformation effect occurs even though there are pauses between words. In this study, the inter stimulus intervals (ISIs) were changed and the time was measured when the perceptual transition arose. The ISIs that were tested were 0, 100, 200, 300, and 400 ms. The subjects were 10 naïve Japanese speakers. The stimulus consisted of a Japanese word with three syllables. As a result, the perceptual transition time changed when ISI changes. Specifically, as the ISI became longer, the number of perceived stimuli increased. The verbal transformation effect is generally said to be caused by the satiation of subjects. It is reasonable to think from the findings here that satiation may imply saturation of auditory short-term/working memory. There was clear evidence that the delay of auditory shortterm/working memory saturation was caused by a longer pause, i.e., longer ISI. It is possible to conclude that this may well be an expression of the capacity of auditory short-term/working memory.
日本音響学会研究発表会講演論文集(CD-ROM), 2017
Le Centre pour la Communication Scientifique Directe - HAL - SHS, Nov 22, 2018
Proceedings of Forum Acusticum, 2011
Journal of the Phonetic Society of Japan, 2014
Journal of the Phonetic Society of Japan, 2014
Journal of the Phonetic Society of Japan
Ikema, an endangered Miyako Ryukyuan dialect spoken in the Miyako islands in Okinawa, Japan, is c... more Ikema, an endangered Miyako Ryukyuan dialect spoken in the Miyako islands in Okinawa, Japan, is characterized by a set of voiced/voiceless geminates in both wordinitial and medial positions. While the geminates /tt ff ss vv zz tts/ appear in initial and medial positions (/tta/ ‘tongue’, /ffa/ ‘child’, /ssa/ ‘grass’, /vva/ ‘you’, /zzu/ ‘fish’, /avva/ ‘oil’), the geminate /dd/ occurs only in medial position (/badda/ ‘side’). As for nasal geminates, one ‘regular’ type appears in word-initial and medial positions (/nna/ ‘spiral shell’, /kannai/ ‘thunder’) while the other occurs only in initial position as a ‘half voiceless nasal’, that is, the first part of the nasal is a voiceless fricative homorganic to the second voiced part (/nna/ ‘rope’, /mmu/ ‘cloud’). The paper provides an acoustic description of these geminates, complementary to an earlier rt-MRI study on obstruent geminates by Fujimoto and Shinohara. In the acoustic study, we used oscillograms and spectrograms to analyze sets o...
Acoustical Science and Technology, 2018
Japanese voiced geminates have a tendency to devoice (e.g. baggu > bakku 'bag'). Voiced obstruent... more Japanese voiced geminates have a tendency to devoice (e.g. baggu > bakku 'bag'). Voiced obstruents have inherent susceptibility for devoicing due to the aerodynamic voicing constraints (AVC), and the susceptibility is higher for geminate obstruents than singletons. As a way to investigate how Japanese speakers realize the contrast between the [+/Àvoice] in obstruents, we examined oral and nasal airflow patterns during intervocalic voiced and voiceless stops in singletons and geminates. The results showed that no nasal airflow appeared during voiced and voiceless stops. Oral airflow showed asymmetry between single and geminate stops in realization of the stop voicing contrast. While the oral airflow pattern clearly differentiates the voiced vs. voiceless contrast in singletons, the patterns are similar in geminates. Acoustic signals also show the same asymmetry between the singletons and geminates. The observed convergence-a clear voicing contrast in singletons vs. a lack of the contrast in geminates, both in oral airflow and acoustic signals, indicate the tendency of neutralization of the voiced geminates into voiceless ones. Our results support the idea of phonetic and articulatory bases in phonological patterning of voicing neutralization in Japanese geminate stops.
The Journal of the Acoustical Society of America, 2016
We investigated the articulation of consonant clusters with Japanese and English speakers using t... more We investigated the articulation of consonant clusters with Japanese and English speakers using the WAVE system (NDI Corp.). Until now we measured the displacement of tongue tip only, but in this study we also measured the displacement of the mandible. The subjects were three Japanese and two English speakers. The speech samples were 4 words: blat, bnat, plat, pnat. All these second consonants, /l, n/ are articulated with tongue tip placed behind alveolar ridge. These words were embedded in a carrier sentence, “Say X.,” and these sentences were uttered 5 times each in random order. The articulation time from first consonants, /b/, /p/, to second consonants, /l/, /n/, were measured. Specifically, the time from the highest point of the mandible to that of the tongue tip was measured. Overall average time was 131.2 ms (Japanese) and 48.1 ms (English). Two-way ANOVA (Language vs. Cluster) showed a significant main effect in Language (p<0.0001). This result suggested that for English speakers, the first and se...
The Journal of the Acoustical Society of America, 2016
Voiced obstruents have inherent susceptibility for devoicing due to the Aerodynamic Voicing Const... more Voiced obstruents have inherent susceptibility for devoicing due to the Aerodynamic Voicing Constraints (AVC), and the susceptibility is higher for geminate obstruents than singletons. As a way to investigate how Japanese speakers realize the contrast between the [ + /-voice] contrast in obstruents, we examined oral and nasal airflow patterns during intervocalic voiced and voiceless stops, in singletons and geminates. The results showed asymmetry between single and geminate stops in realization of the stop voicing contrast. Airflow pattern clearly differentiates voiced vs. voiceless contrast in singletons, but the airflow patterns are similar in geminates. Acoustic signals also shows the same asymmetry between the singletons and geminates. The observed convergence—clear voicing contrast in singletons vs. the lack of the contrast in geminates both in air flow and acoustic signals indicate neutralization of the voiced geminates into voiceless ones. Our results support the idea of phonetic bases in phonologi...
Handbook of Japanese Phonetics and Phonology, 2015
IEIC Technical Report (Institute of Electronics, Information and Communication Engineers), 2002
Abstract; Although paralinguistic information (like'disbelief'and'disappointment&#... more Abstract; Although paralinguistic information (like'disbelief'and'disappointment') is a common phenomenon in everyday speech, the speech production mechanism of paralinguistic information is not well understood. As a part of our effort to clarify the transmission mechanism of paralinguistic information, a high-speed digital video imaging of larynx was conducted to investigate the variation of phonation type caused by paralinguistic information. The glottal area and distance between the two vocal folds were measured for ...
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Papers by Masako Fujimoto