DSpace Repository :: Browsing by Author "Kitazaki, Michiteru"

Browsing by Author "Kitazaki, Michiteru"

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Airflow Presentation Method for Turning Motion Feedback in VR Environment
(The Eurographics Association, 2019) Suzuki, Yujin; Yem, Vibol; Hirota, Koichi; Amemiya, Tomohiro; Kitazaki, Michiteru; Ikei, Yasushi; Kakehi, Yasuaki and Hiyama, Atsushi
This paper describes the effectiveness of airflow presentation to reduce VR sickness and induce vection during turning motion. Five airflow displays were placed surrounding the face and the angle interval of each display was 45 °. Each has 0.6 m distant from the face. Two directions of turning motion: left and right, were visually presented. Result showed that airflow from any direction could reduce VR sickness. Moreover, we confirmed that the airflow presented in 45 ° from in front direction to the turning direction (left or right) enhanced the perception of vection.
Design of Body Transformation Experience
(The Eurographics Association, 2023) Murakami, Taichi; Kitazaki, Michiteru; Abey Campbell; Claudia Krogmeier; Gareth Young
Humans can feel an illusory body ownership towards bodies that are different from the real one. It has been well studied how the virtual embodiment can be realized and what can be embodied. However, it is not clear how we feel when our body changes from one body to another. We aimed to provide different experiences of body transformation by varying the transition patterns of avatars. We created five types of avatar transitions. In Flicker process, the body appearance changes instantly from one avatar to another, but with a blank screen in the middle. In Cut process, the body appearance changes instantly without blank. In Smooth process, the avatar's body appearance transforms gradually and smoothly according to a smoothstep function. In Linear process, the avatar's body appearance transforms gradually according to a linear function. InWave process, the avatar's body appearance transforms like a wave or back and forth according to a mixture of linear function and sinusoidal function. We expect that participants will be the most aware of body transformation in the Wave transition followed by Linear and Smooth transitions. The Flicker and Cut transitions are natural and less noticed by participants.
Effect of Motion and Hand Shape of a Massage Robot on Social Impression: Exploratory study in a Virtual Environment
(The Eurographics Association, 2020) Yamamoto, Kyosuke; Kato, Yuki; Tasaki, Ryosuke; Akiduki, Takuma; Mashimo, Tomoaki; Honna, Atsuo; Kitazaki, Michiteru; Kulik, Alexander and Sra, Misha and Kim, Kangsoo and Seo, Byung-Kuk
We aimed to investigate the effects of motion pattern and hand shape on social impressions of a massage robot. The experiment was performed in a virtual environment as an exploratory study. Participants observed a massage robot touching their body, and answered the Robot Social Attributes Scale. There were two motion patterns (discontinuous and smooth) and three types of end effectors (ball, robot hand, and human hand). We found that the massage robot was perceived more competent, warmer, and more comfortable when it moved smoothly than when it moved discontinuously, and the impression of warmth was higher for the human hand than the ball end effector. These results suggest that the massage robot should move smoothly and it would be better if its end effector is like a human hand.
Empathy with Human's and Robot's Embarrassments in Virtual Environments
(The Eurographics Association, 2020) Sugiura, Maruta; Higashihata, Kento; Sato, Atsushi; Itakura, Shoji; Kitazaki, Michiteru; Kulik, Alexander and Sra, Misha and Kim, Kangsoo and Seo, Byung-Kuk
We feel embarrassed not only when we are embarrassed but also when we are watching others embarrassed. Humans show empathy for pain not only human others but also robots. However, it has not been investigated whether humans show empathy for robot's embarrassment. Thus, we aimed to test whether humans can empathize with robot's embarrassment in virtual environments. Four situations both of non-embarrassing and embarrassing stimuli were presented on an HMD, and participants were asked to rate their own feeling of embarrassment and the actor's feeling of embarrassment. We found that the own feeling of embarrassment was higher in human than robot actors, and higher in embarrassing than non-embarrassing conditions. The actor's feeling of embarrassment was rated higher in embarrassing than non-embarrassing conditions, and the effect was much larger in human than robot actors. These results suggest that participants could show empathy with both for human and robot in the embarrassing situations, but they infer that the robot feels less embarrassed than humans.
Generation of Walking Sensation by Upper Limb Motion
(The Eurographics Association, 2019) Sueta, Gaku; Saka, Naoyuki; Yem, Vibol; Amemiya, Tomohiro; Kitazaki, Michiteru; Sato, Makoto; Ikei, Yasushi; Kakehi, Yasuaki and Hiyama, Atsushi
This paper proposes a method to generate a turning walk sensation to the user by an arm swing display. We assumed a hypothesis that the turning walk sensation is generated by providing different motion profiles of passive arm swing on the left and right arms. We show that turning walk sensation can be generated by presenting arm swing motion with a different flexion ratio of the shoulder joint, depending on the turning radius.
Invisible Long Arm Illusion: Illusory Body Ownership by Synchronous Movement of Hands and Feet
(The Eurographics Association, 2018) Kondo, Ryota; Ueda, Sachiyo; Sugimoto, Maki; Minamizawa, Kouta; Inami, Masahiko; Kitazaki, Michiteru; Bruder, Gerd and Yoshimoto, Shunsuke and Cobb, Sue
We feel as if a fake body is our own body by synchronicity between the fake body and the actual body (illusory body ownership) even if the body has a different shape. In our previous study, we showed that illusory body ownership can be induced to an invisible body through the synchronous movement of just the hands and feet. In this study, we investigated whether illusory body ownership can be induced to the invisible body even when the arm length of the invisible body was different from the usual body. We modified the length of arm of a full body avatar or changed the position of the hand of the invisible body stimulus, and found that the illusory body ownership was induced to the transformed body by synchronous movement. Participants' reaching behavior gradually changed to use the longer arm more during the learning of the transformed body.
Pseudo Physical Contact and Communication in VRChat: A Study with Survey Method in Japanese Users
(The Eurographics Association, 2020) Nagamachi, Kazuya; Kato, Yuki; Sugimoto, Maki; Inami, Masahiko; Kitazaki, Michiteru; Kulik, Alexander and Sra, Misha and Kim, Kangsoo and Seo, Byung-Kuk
VRChat is one of social virtual reality platforms and getting popular. Pseudo physical contacts are used for communication in VRChat. We performed a questionnaire survey for VRChat users (N=341) in Japan to take statistics of users and their avatars, and to investigate effects of pseudo physical contacts on interpersonal attractiveness and communication. Users were 87% male, 8% female, and 4% neutral genders in the real world, while their avatars were 4% male, 87% female, and 9% neutral. Participants answered that the interpersonal attractiveness increased and the communication difficulty decreased after pseudo physical contacts, suggesting that the pseudo physical contact may improve our social relationship without actual touch.
Rendering of Walking Sensation for a Sitting User by Lower Limb Motion Display
(The Eurographics Association, 2019) Yamaoka, Kentaro; Koide, Ren; Amemiya, Tomohiro; Kitazaki, Michiteru; Yem, Vibol; Ikei, Yasushi; Kakehi, Yasuaki and Hiyama, Atsushi
This paper describes the characteristics of presentation of a lower limb motion display designed to create a walking motion sensation for a sitting user. It has the function of lifting and translation independently applied to both legs to generate a walking sensation by moving the feet alternately as in the real walk. According to the results of the experiments, our system enables to render a walking sensation by drawing a trajectory with an amplitude of about 10% of the real walking. Although the backward amplitude was larger than the forward amplitude in real walking, our system created walking sensation to the sitting user better when the forward amplitude was larger than the backward amplitude having opposite characteristics to the real walking.
Sense of Ownership, Self-location, and Gaze Responses in Virtual Rubber Hand Illusion
(The Eurographics Association, 2022) Komori, Takumi; Ishimoto, Hiroki; Ganesh, Gowrishankar; Sugimoto, Maki; Inami, Masahiko; Kitazaki, Michiteru; Theophilus Teo; Ryota Kondo
It is known that the illusion of body ownership, like as the rubber hand illusion, affects the proprioceptive sense of body position. In the present study, we investigated whether eye movements and pupil responses to the location where the sense of body ownership was induced were also affected. We presented a virtual left hand on a head mounted display and stroked both the virtual hand and the real left hand with a brush, while a light suddenly appeared on the virtual left hand or empty right space randomly. The participants were asked to move the eyes on the light. We found that the illusory ownership of the virtual hand occurred with proprioceptive self-location drift by the synchronous stroking, but the saccade eye movements and pupil sizes were not affected by the illusory body ownership, suggesting that the gaze responses may be independent from the self-body representation.
Sign Language Learning System with Concurrent Shared Avatar Hand in a Virtual Environment: Psychological Evaluation
(The Eurographics Association, 2022) Katsumata, Yasunobu; Ishimoto, Hiroki; Inoue, Yasuyuki; Kitazaki, Michiteru; Theophilus Teo; Ryota Kondo
We aimed to develop a sign language learning system using virtual reality to improve learning motivation. Hand movements for twenty words consisted of three letters were recorded with a hand motion capture system (model hand). In the learning system, the participant was asked to mimic the model hand movement while looking at both the model hand and the ''own hand'' in a head mounted display (HMD) with the hand motion capture. The ''own hand'' avatar was either of the real own hand or the shared hand motion, which was made by averaging the participant's hand and the model hand movements. The model hand was presented either in the opposite or same direction as the participant. Participants rated the usability of the system in 2 x 2 (own/shared hand x opposite/same direction) experimental blocked design. We found that the shared hand avatar and the same direction presentation were better than the own hand and the opposite direction presentation, respectively. Thus, the proposed shared hand avatar system with the HMD and hand motion capture could improve sign language learning.
System for Body Motion Capture While Moving in Large Area
(The Eurographics Association, 2019) Yuasa, Yusuke; Tamura, Hideki; Yem, Vibol; Amemiya, Tomohiro; Kitazaki, Michiteru; Ikei, Yasushi; Kakehi, Yasuaki and Hiyama, Atsushi
Previous motion capture device such as OptiTrack has actively used. However, it is suitable to measure in a narrow space. We proposed a system to measure the body motion while walking in a large area. In the system we attached OptiTrack, Depth sensor and 9-axis sensor to a mobile vehicle. This paper reports the potential of our system.
Visual Presentation For Sports Skill Lerning in VR
(The Eurographics Association, 2019) Miyashita, Fumiya; Amemiya, Tomohiro; Kitazaki, Michiteru; Kasamatsu, Keiko; Yem, Vibol; Ikei, Yasushi; Kakehi, Yasuaki and Hiyama, Atsushi
This paper describes the viewpoint suitable for sports training in virtual reality (VR). We compared first-person and third-person view in the accuracy of cognitive simulation and reproduction of the body part trajectory. From the third-person view, the participants were able to understand 66% of the whole body's movement, and from the first-person view, they were able to understand 52%. However, when observing complex movement such as position grasp of a forearm, the third-person view enabled memorization of the position significantly better than the first-person view. It was suggested that the viewpoint needs to be changed depending on the features of the sports.
Visual Search of Interactive Gaze in a Virtual Environment: Detecting Eye Contact is Faster than Gaze Averting
(The Eurographics Association, 2019) Yamamoto, Kyosuke; Kitazaki, Michiteru; Kakehi, Yasuaki and Hiyama, Atsushi
We often gaze at each other when we communicate with others intimately. A previous study with static stimuli has revealed that perception of others' gaze is asymmetric only when the head is deviated; gazing face target is found faster than averting gaze target. However, the gaze research has been limited to static eye's stimuli, and the perceptual processing of dynamic gaze has not yet been investigated. Therefore, we created dynamic and interactive gaze stimuli of frontal heads in a virtual environment using a head mounted display that can measure eye movements, and conducted visual search experiments. We found that the gaze contacting target presented among gaze averting distractors was detected faster than the gaze averting target among gaze directing distractors. Thus, the detecting eye contact is faster than gaze averting even with frontal faces in dynamic environments, suggesting that dynamic eye contact has a special value for human perception.
VR Sickness Reduction in Stereoscopic Video Streaming System 'TwinCam' for a Remote Experience
(The Eurographics Association, 2019) Yagi, Ryunosuke; Fujie, Toi; Amemiya, Tomohiro; Kitazaki, Michiteru; Yem, Vibol; Ikei, Yasushi; Kakehi, Yasuaki and Hiyama, Atsushi
In the present paper, a method to present remote stereoscopic vision with decreased VR sickness is discussed. Our omnidirectional stereoscopic video streaming system (TwinCam) is described introducing the merit of the design. One of the important features is VR sickness reduction which we evaluated by assessing the simulator sickness questionnaire comparing it with conventional parallel cameras design. The result revealed that the TwinCam has significantly suppressed VR sickness from the conventional parallel cameras, at the same level of a fixed monocular camera.

Browsing by Author "Kitazaki, Michiteru"

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