Browsing by Author "Kuzuoka, Hideaki"

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    Controlling the Distribution of Salty Taste Intensity on the Tongue Using Extraoral Galvanic Taste Stimulation
    (The Eurographics Association, 2023) Tanaka, So; Narumi, Takuji; Amemiya, Tomohiro; Kuzuoka, Hideaki; Aoyama, Kazuma; Abey Campbell; Claudia Krogmeier; Gareth Young
    Galvanic taste stimulation (GTS) alters taste intensity by applying a weak electric current around the oral cavity. Previous studies on GTS have captured the overall trend of taste changes in the oral cavity produced by GTS. However, it is not well known whether the potentiating or inhibitory effects of GTS result in a spatial gradient of taste perception in the oral cavity. Therefore, in this study, we examined the possibility of spatially selective modulation of taste intensity produced in the oral cavity by GTS. The results suggested that it is possible to present the intensity gradient of the perceived taste in the frontback and left-right directions, depending on the arrangement of the electrodes. These results are expected to contribute to the presentation of taste changes that are close to the actual eating and drinking experience, and to the provision of a new taste experience in which the taste is perceived as it moves through the oral cavity.
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    Influence of Pseudo-haptic Weight on Product Rarity Valuation
    (The Eurographics Association, 2023) Okura, Naoya; Oyanagi, Akemi; Narumi, Takuji; Kuzuoka, Hideaki; Amemiya, Tomohiro; Abey Campbell; Claudia Krogmeier; Gareth Young
    There has been an increasing number of online shopping services that employ VR technologies so that they give customers more realistic experiences and amplify purchase intention. Meanwhile, it is known that the actual product's weight perception affects its valuation. However, verification of this phenomenon in virtual environments has rarely been reported. This study investigated the influence of weight perception generated by pseudo-haptics on product rarity valuation and purchase intention in virtual environments. The results suggest that, although individual and product differences were observed, the overall trend was that product rarity valuation was higher when the user's perceived weight was heavier than when the perceived weight was lighter.
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    Insights from an Experiment Investigating the Relationship between the Effect of Electrical Stimulation of the Ankle Tendons and the User's Biological Structure, Gender, or Age
    (The Eurographics Association, 2024) Ota, Takashi; Kuzuoka, Hideaki; Amemiya, Tomohiro; Aoyama, Kazuma; Hasegawa, Shoichi; Sakata, Nobuchika; Sundstedt, Veronica
    The effects of transcutaneous electrical nerve stimulation (TENS) have individual differences in sensory presentation. These differences may stem from variations in the user's biological structure, including body size and skin conditions. In particular, TENS of the lower limbs is assumed to be affected by the differences in biological structure because the muscles of the lower limbs are larger than the muscles of the upper limbs, and a certain number of people have more hair on their skin than those of the upper limbs. Identifying the factors that explain these individual differences in TENS is crucial for evaluating the potential applications of TENS and developing appropriate research protocols in the future. In this study, we examined the individual differences in the effects of TENS by focusing on tendon electrical stimulation of the ankle, a method that presents body tilt sensations. Specifically, we investigated the correlation between the body tilt sensations and demographic (age, gender) or biostructure metrics (body weight, body fat percentage, etc.) in 28 experimental participants. The results revealed significant differences in the correct answer rate and the magnitude of body tilt sensations based on gender. Furthermore, there was a correlation between the correct answer rate or magnitude and the age of female participants at specific stimulation intensities. No biostructure metrics in this study were sufficiently correlated with the correct answer rate or magnitude of body tilt sensations.