Browsing by Author "Inami, Masahiko"

Now showing 1 - 4 of 4
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    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.
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    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.
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    Real Time Remapping of a Third Arm in Virtual Reality
    (The Eurographics Association, 2019) Drogemuller, Adam; verhulst, adrien; Volmer, Benjamin; Thomas, Bruce; Inami, Masahiko; Sugimoto, Maki; Kakehi, Yasuaki and Hiyama, Atsushi
    We present an initial study investigating the usability of a system for users to use their own limbs (here the left arm, right arm, left leg, right leg and head) to remap and control a virtual third arm. The remapping was done by: pre-selecting the limb by gazing over it, then selecting it by voice activation (here we asked the participants to say ''switch''). The system was evaluated in Virtual Reality (VR), where we recorded the performance of participants (N=12, within-group design) in 2 box collection tasks. We found that participants self-reported: (i) significantly less body ownership in switching limbs than in not switching limbs; and (ii) less effort in switching limbs than not switching limbs. In addition, we found that dominant limbs do not significantly affect remap decisions in controlling the third arm.
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    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.