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Your search keyword '"Otsuka, Sadao"' showing total 19 results
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19 results on '"Otsuka, Sadao"'

1. Preliminary Study on Virtual Reality Framework for Effective Prospective Memory Training: Integration of Visual Imagery and Daily-life Simulations

Author

Fukumori, Satoshi, Miura, Kayoko, Takamori, Ayako, and Otsuka, Sadao

Subjects
Computer Science - Human-Computer Interaction
Abstract

Prospective memory (PM), defining the currently conceived intention of a future action, is crucial for daily functioning, particularly in aging populations. This study develops and validates a virtual reality prospective memory training (VR-PMT) system that integrates visual imagery training (VIT) and virtual reality training (VRT) to enhance the PM abilities of users. The framework is designed to progressively challenge users by simulating real-life PM tasks in a controlled VR environment. The VIT component is designed to improve the generation and utilization of visual imagery by users, while the VRT component provides PM tasks based on time and event cues within a virtual environment.The framework was evaluated on ten healthy adults (university students and elderly participants) over nine weeks. During the initial session, the baseline PM abilities of the participants were assessed using the memory for intentions screening test (MIST). The subsequent sessions alternated between VIT and VRT with increasing task complexity. The MIST scores were significantly positively correlated with task achievement, confirming the efficacy of the system. Imagery abilities were also strongly correlated with task performance, underscoring the importance of visual imagery in PM training.Usability and user experiences, evaluated on the Jikaku-sho Shirabe questionnaire and the user experience questionnaire, indicated an overall positive user experience but higher fatigue levels in elderly participants. This study demonstrates that the VR--PMT system effectively trains and assesses PM abilities by integrating VIT and VRT, supporting its potential for broader applications in clinical settings., Comment: This manuscript has been submitted to IEEE Access

Published
2024

4. Atypical Multisensory Integration and the Temporal Binding Window in Autism Spectrum Disorder

Author

Kawakami, Sayaka, Uono, Shota, Otsuka, Sadao, Yoshimura, Sayaka, Zhao, Shuo, and Toichi, Motomi

Abstract

The present study examined the relationship between multisensory integration and the temporal binding window (TBW) for multisensory processing in adults with Autism spectrum disorder (ASD). The ASD group was less likely than the typically developing group to perceive an illusory flash induced by multisensory integration during a sound-induced flash illusion (SIFI) task. Although both groups showed comparable TBWs during the multisensory temporal order judgment task, correlation analyses and Bayes factors provided moderate evidence that the reduced SIFI susceptibility was associated with the narrow TBW in the ASD group. These results suggest that the individuals with ASD exhibited atypical multisensory integration and that individual differences in the efficacy of this process might be affected by the temporal processing of multisensory information.

Published
2020
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5. Everything Has Its Time: Narrow Temporal Windows Are Associated with High Levels of Autistic Traits via Weaknesses in Multisensory Integration

Author

Kawakami, Sayaka, Uono, Shota, Otsuka, Sadao, Zhao, Shuo, and Toichi, Motomi

Abstract

The present study examined whether fundamental sensory functions such as temporal processing and multisensory integration are related to autistic traits in the general population. Both a narrower temporal window (TW) for simultaneous perception, as measured by a temporal order judgement task, and a reduced ability to engage in multisensory integration during the sound-induced flash illusion task were related to higher levels of autistic traits. Additionally, a narrow TW is associated with high levels of autistic traits due to a deficiency in multisensory integration. Taken together, these findings suggest that alterations in fundamental functions produce a cascading effect on higher-order social and cognitive functions, such as those experienced by people with autism spectrum disorder.

Published
2020
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8. Emotion Perception Mediates the Predictive Relationship between Verbal Ability and Functional Outcome in High-Functioning Adults with Autism Spectrum Disorder

Author

Otsuka, Sadao, Uono, Shota, Yoshimura, Sayaka, Zhao, Shuo, and Toichi, Motomi

Abstract

The aim of this study was to identify specific cognitive abilities that predict functional outcome in high-functioning adults with autism spectrum disorder (ASD), and to clarify the contribution of those abilities and their relationships. In total, 41 adults with ASD performed cognitive tasks in a broad range of neuro- and social cognitive domains, and information concerning functional outcomes was obtained. Regression analyses revealed that emotion perception and verbal generativity predicted adaptive functioning directly, and the former mediated between the other two. These findings provide the first evidence of a triadic relationship among neuro- and social cognition and functional outcome in this population. Our results suggest that psychosocial interventions targeting these cognitive abilities could benefit social adaptation in adults with ASD.

Published
2017
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11. Cognitive underpinnings of multidimensional Japanese literacy and its impact on higher-level language skills

Author

00816986, 30335286, Otsuka, Sadao, Murai, Toshiya, 00816986, 30335286, Otsuka, Sadao, and Murai, Toshiya

Abstract

This study aimed to identify the cognitive underpinnings of Japanese kanji abilities and clarify the contributions of kanji acquisition to the development of higher-level language skills based on a three-dimensional view of kanji abilities encompassing reading accuracy, writing accuracy, and semantic comprehension. First, a series of regression analyses was used to identify the multifactorial models of each dimension of Japanese kanji acquisition. These models suggest that, among basic cognitive skills, naming speed, visuospatial processing, and syntactic processing underpin kanji abilities in a dimension-specific manner, whereas phonological processing is a common factor. Second, although all the dimensions of kanji abilities predicted acquired verbal knowledge equally, writing skills on the text level, measured as idea density, were only predicted by the writing dimension (indirectly via acquired knowledge). Our findings represent the first evidence of the dimension-specific relationships of the three dimensions of Japanese kanji abilities with their cognitive predictors, as well as with higher-level language skills. They suggest the importance of handwriting acquisition during school years for the development of language skills through to adulthood. Finally, taking the seminal “Nun study, ” which suggests that higher idea density is protective against dementia, into account, we propose a theoretical framework for the lifelong trajectory of literacy acquisition.

Published
2021

12. The multidimensionality of Japanese kanji abilities

Author

00816986, 30335286, Otsuka, Sadao, Murai, Toshiya, 00816986, 30335286, Otsuka, Sadao, and Murai, Toshiya

Abstract

The aim of this study was to identify the cognitive structures of kanji abilities in the Japanese general population and to examine age and cohort effects on them. From a large database of the most popular kanji exam in Japan, we analyzed high school graduation level data of 33, 659 people in 2006 and 16, 971 people in 2016. Confirmatory factor analyses validated the three-dimensional model of kanji abilities, including factors of reading, writing and semantic comprehension. Furthermore, the age effect on writing, and correlations between writing and semantic dimensions, were different between 2006 and 2016, suggesting reduced writing ability and stagnation in integrated mastery of kanji orthography and semantics in current-day Japanese adults. These findings provide the first evidence of the multidimensional nature of Japanese kanji abilities, and age/cohort differences in that dimensional structure. The importance of the habit of handwriting for literacy acquisition is discussed.

Published
2020

19. Multisensory Processing in Autism Spectrum Disorders

Author

Kawakami S, Otsuka S, and Grabrucker AM

Abstract

Regarding the atypical characteristics of cognition and information processing in individuals with autism spectrum disorder (ASD), recent focus has been centered around fundamental processing, such as multisensory integration (MSI). Experimental studies have reported atypical MSI, especially audio-visual integration, in both children and adults with ASD using social (e.g., faces and voices) and nonsocial stimuli (e.g., flashes and beeps). Furthermore, there has been a gradual increase in the understanding of the behavioral (e.g., higher temporal resolution) and neural mechanisms (e.g., impaired phase alignment of neuro-oscillations) underlying atypical MSI in ASD. Previous studies have proposed that prominent deficits in social cognition and interactions (i.e., higher-order functions) are influenced and/or induced by atypicalities in MSI (i.e., lower-order function). Thus, interventions targeting MSI may promote social cognition, likely resulting in better outcomes in adulthood in individuals with ASD. This chapter describes current knowledge regarding multisensory processing in ASD and future perspectives on relevant research and practices. We highlight the value of focusing on MSI for understanding the clinical characteristics of ASD and possible interventions targeting MSI for this population., (Copyright: The Authors.)

Published
2021
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