ICAT-EGVE2014

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https://diglib.eg.org/handle/10.2312/7758

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Browsing ICAT-EGVE2014 by Subject "H.5.1 [Information Interfaces and Presentation]"

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    The Effects of Avatars on Presence in Virtual Environments for Persons with Mobility Impairments
    (The Eurographics Association, 2014) Guo, Rongkai; Samaraweera, Gayani; Quarles, John; Takuya Nojima and Dirk Reiners and Oliver Staadt
    The main question we ask is: How do avatars affect presence specifically for Persons with Mobility Impairments (PMIs)? For example, PMIs' deficits in the proprioceptive sense could affect their body perception in immersive virtual reality, which could impact presence. To investigate this we replicated the classic virtual pit experiment and included a responsive full body avatar (or lack thereof) as a 3D user interface. We recruited from two different populations: 11 PMIs and another 11 Persons without Mobility Impairments (PNMIs) as a control. Each PNMI was matched to a PMI based on age, weight, height, and prior VE exposure. Results of this study indicate that avatars elicit a higher sense of presence for PMIs than for PNMIs. In addition, results suggest that PMIs are easier to immerse in VEs than PNMIs, which may further motivate the future use of VE technology for PMIs.
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    Interpretation of Tactile Sensation using an Anthropomorphic Finger Motion Interface to Operate a Virtual Avatar
    (The Eurographics Association, 2014) Ujitoko, Yusuke; Hirota, Koichi; Takuya Nojima and Dirk Reiners and Oliver Staadt
    The objective of the system presented in this paper is to give users tactile feedback while walking in a virtual world through an anthropomorphic finger motion interface. We determined that the synchrony between the first person perspective and proprioceptive information together with the motor activity of the user's fingers are able to induce an illusionary feeling that is equivalent to the sense of ownership of the invisible avatar's legs. Under this condition, the perception of the ground under the virtual avatar's foot is felt through the user's fingertip. The experiments indicated that using our method the scale of the tactile perception of the texture roughness was extended and that the enlargement ratio was proportional to the avatar's body (foot) size. In order to display the target tactile perception to the users, we have to control only the virtual avatar's body (foot) size and the roughness of the tactile texture. Our results suggest that in terms of tactile perception fingers can be a replacement for legs in locomotion interfaces.
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    Short Paper: A Video Self-avatar Influences the Perception of Heights in an Augmented Reality Oculus Rift
    (The Eurographics Association, 2014) Gutekunst, Matthias; Geuss, Michael; Rauhoeft, Greg; Stefanucci, Jeanine; Kloos, Uwe; Mohler, Betty; Takuya Nojima and Dirk Reiners and Oliver Staadt
    This paper compares the influence a video self-avatar and a lack of a visual representation of a body have on height estimation when standing at a virtual visual cliff. A height estimation experiment was conducted using a custom augmented reality Oculus Rift hardware and software prototype also described in this paper. The results show a consistency with previous research demonstrating that the presence of a visual body influences height estimates, just as it has been shown to influence distance estimates and affordance estimates.