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Your search keyword '"Yamazaki, Yoshihiko"' showing total 16 results
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16 results on '"Yamazaki, Yoshihiko"'

1. End-to-End Joint Target and Non-Target Speakers ASR

Author

Masumura, Ryo, Makishima, Naoki, Yamane, Taiga, Yamazaki, Yoshihiko, Mizuno, Saki, Ihori, Mana, Uchida, Mihiro, Suzuki, Keita, Sato, Hiroshi, Tanaka, Tomohiro, Takashima, Akihiko, Suzuki, Satoshi, Moriya, Takafumi, Hojo, Nobukatsu, and Ando, Atsushi

Subjects
Computer Science - Computation and Language, Computer Science - Sound, Electrical Engineering and Systems Science - Audio and Speech Processing
Abstract

This paper proposes a novel automatic speech recognition (ASR) system that can transcribe individual speaker's speech while identifying whether they are target or non-target speakers from multi-talker overlapped speech. Target-speaker ASR systems are a promising way to only transcribe a target speaker's speech by enrolling the target speaker's information. However, in conversational ASR applications, transcribing both the target speaker's speech and non-target speakers' ones is often required to understand interactive information. To naturally consider both target and non-target speakers in a single ASR model, our idea is to extend autoregressive modeling-based multi-talker ASR systems to utilize the enrollment speech of the target speaker. Our proposed ASR is performed by recursively generating both textual tokens and tokens that represent target or non-target speakers. Our experiments demonstrate the effectiveness of our proposed method., Comment: Accepted at Interspeech 2023

Published
2023

2. Synaptic Plasticity in Hippocampal CA1 Neurons of Mice Lacking Inositol-1,4,5- Trisphosphate Receptor-Binding Protein Released with IP[subscript 3] (IRBIT)

Author

Goto, Jun-Ichi, Fujii, Satoshi, Fujiwara, Hiroki, Mikoshiba, Katsuhiko, and Yamazaki, Yoshihiko

Abstract

In hippocampal CA1 neurons of wild-type mice, a short tetanus (15 or 20 pulses at 100 Hz) or a standard tetanus (100 pulses at 100 Hz) to a naive input pathway induces long-term potentiation (LTP) of the responses. Low-frequency stimulation (LFS; 1000 pulses at 1 Hz) 60 min after the standard tetanus reverses LTP (depotentiation [DP]), while LFS applied 60 min prior to the standard tetanus suppresses LTP induction (LTP suppression). We investigated LTP, DP, and LTP suppression of both field excitatory postsynaptic potentials and population spikes in CA1 neurons of mice lacking the inositol 1,4,5-trisphosphate (IP[subscript 3]) receptor (IP[subscript 3]R)-binding protein released with IP[subscript 3] (IRBIT). The mean magnitudes of LTP induced by short and standard tetanus were not different in mutant and wild-type mice. In contrast, DP and LTP suppression were attenuated in mutant mice, whereby the mean magnitude of responses after LFS or tetanus were significantly greater than in wild-type mice. These results suggest that, in hippocampal CA1 neurons, IRBIT is involved in DP and LTP suppression, but is not essential for LTP. The attenuation of DP and LTP suppression in mice lacking IRBIT indicates that this protein, released during or after priming stimulations, determines the direction of LTP expression after the delivery of subsequent stimulations.

Published
2022
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7. End-to-End Joint Target and Non-Target Speakers ASR

Author

Masumura, Ryo, primary, Makishima, Naoki, additional, Yamane, Taiga, additional, Yamazaki, Yoshihiko, additional, Mizuno, Saki, additional, Ihori, Mana, additional, Uchida, Mihiro, additional, Suzuki, Keita, additional, Sato, Hiroshi, additional, Tanaka, Tomohiro, additional, Takashima, Akihiko, additional, Suzuki, Satoshi, additional, Moriya, Takafumi, additional, Hojo, Nobukatsu, additional, and Ando, Atsushi, additional

Published
2023
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10. Changes in Japanese Junior High School Students' Sense of Coherence Before and After the Onset of the COVID-19 Pandemic: A Longitudinal Study of Children and Mothers

Author

Omiya, Tomoko, Deguchi, Naoko, Sakata, Yumiko, Takata, Yuriko, and Yamazaki, Yoshihiko

Subjects
Psychiatry, mothers, Psychiatry and Mental health, education, junior high school students, longitudinal study, Japanese, RC435-571, COVID-19, sense of coherence, Original Research
Abstract

We conducted a longitudinal study to clarify the changes in the sense of coherence (SOC); that is, the ability to cope with stress successfully, of 166 Japanese junior high school students and their mothers before and after the onset of the COVID-19 pandemic. First, we analyzed changes in SOC at three time points for all students and divided them into two groups: Group 1 included students with SOC scores that increased or maintained before and after the onset of the pandemic and Group 2 included students with decreased SOC scores after the onset of the pandemic. Second, we conducted a comparative analysis between the two groups. Overall, results indicated that student's SOC scores increased. Additionally, interpersonal stress scores were lower after the onset of the pandemic than before. There were almost no differences in family relationships, financial conditions, or personality tendencies between the two groups. However, Group 2 did not regain their sense of belonging to school. In this group, the frequency of stress experiences in club activities after the onset of the pandemic, troubles with the opposite gender, and inability to catch up with the contents of the subject lecture were high. The accumulation of small stressors may have hindered the maintenance of a sense of school affiliation. Mothers of students in Group 2 either were full-time employees at baseline or had started a new job after the onset of the pandemic. Their children may have been affected by the household's damaged financial budget and changes in mother's working styles. As COVID-19 reduced the number of days students went to school, students' SOC could have reduced had they not felt a sense of presence or belonging due to the lack of participation in club activities, school events, etc. Teachers and mothers should communicate carefully with their students and children, respectively, to develop a sense of belonging.

Published
2022

16. Synaptic plasticity in hippocampal CA1 neurons of mice lacking inositol-1,4,5-trisphosphate receptor-binding protein released with IP 3 (IRBIT).

Author

Goto JI, Fujii S, Fujiwara H, Mikoshiba K, and Yamazaki Y

Subjects
Animals, Carrier Proteins metabolism, Electric Stimulation methods, Hippocampus physiology, Inositol 1,4,5-Trisphosphate Receptors genetics, Inositol 1,4,5-Trisphosphate Receptors metabolism, Long-Term Potentiation physiology, Mice, Neuronal Plasticity physiology, Neurons physiology, Adenosylhomocysteinase genetics, Tetanus
Abstract

In hippocampal CA1 neurons of wild-type mice, a short tetanus (15 or 20 pulses at 100 Hz) or a standard tetanus (100 pulses at 100 Hz) to a naive input pathway induces long-term potentiation (LTP) of the responses. Low-frequency stimulation (LFS; 1000 pulses at 1 Hz) 60 min after the standard tetanus reverses LTP (depotentiation [DP]), while LFS applied 60 min prior to the standard tetanus suppresses LTP induction (LTP suppression). We investigated LTP, DP, and LTP suppression of both field excitatory postsynaptic potentials and population spikes in CA1 neurons of mice lacking the inositol 1,4,5-trisphosphate (IP 3 ) receptor (IP 3 R)-binding protein released with IP 3 (IRBIT). The mean magnitudes of LTP induced by short and standard tetanus were not different in mutant and wild-type mice. In contrast, DP and LTP suppression were attenuated in mutant mice, whereby the mean magnitude of responses after LFS or tetanus were significantly greater than in wild-type mice. These results suggest that, in hippocampal CA1 neurons, IRBIT is involved in DP and LTP suppression, but is not essential for LTP. The attenuation of DP and LTP suppression in mice lacking IRBIT indicates that this protein, released during or after priming stimulations, determines the direction of LTP expression after the delivery of subsequent stimulations., (© 2022 Goto et al.; Published by Cold Spring Harbor Laboratory Press.)

Published
2022
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