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Details

  • Name

    José Vasconcelos Raposo
  • Cluster

    Computer Science
  • Role

    Research Coordinator
  • Since

    01st April 2015
002
Publications

2019

Adaptation and Validation of the Temple Presence Inventory in a Portuguese Population

Authors
Vasconcelos Raposo, J; Bessa, M; Teixeira, CM; Cabral, L; Melo, M;

Publication
International Journal of Human–Computer Interaction

Abstract

2019

Adaptation and Validation of the ITC - Sense of Presence Inventory for the Portuguese language

Authors
Vasconcelos Raposo, J; Melo, M; Teixeira, C; Cabra, L; Bessa, M;

Publication
International Journal of Human-Computer Studies

Abstract

2019

Immersive 360° video user experience: impact of different variables in the sense of presence and cybersickness

Authors
Narciso, D; Bessa, M; Melo, M; Coelho, A; Vasconcelos Raposo, J;

Publication
Universal Access in the Information Society

Abstract
Virtual Reality (VR) has been recently gaining interest from researchers and companies, contributing to the development of the associated technologies that aim to transport its users to a virtual environment by the stimulation of their senses. Technologies such as Head-Mounted Displays (HMD), capable of presenting 360° video in 3D, are becoming affordable and, consequently, more common among the average consumer, potentiating the creation of a market for VR experiences. The purpose of this study is to measure the influence of (a) video format (2D/monoscopic vs 3D/stereoscopic), (b) sound format (2D/stereo vs 3D/spatialized), and (c) gender on users’ sense of presence and cybersickness, while experiencing a VR application using an HMD. Presence and cybersickness were measured using questionnaires as subjective measures. Portuguese versions of the Igroup Presence Questionnaire for presence and the Simulator Sickness Questionnaire for cybersickness were used. Results revealed no statistically significant differences between (a) VIDEO and (b) SOUND variables on both senses of presence and cybersickness. When paired with (a) VIDEO, the independent variable (c) Gender showed significant differences on almost all subscales of presence. Results suggest that the widely acknowledged differences in spatial ability between genders were a major factor contributing to this outcome. © 2017 Springer-Verlag GmbH Germany

2018

Presence and cybersickness in immersive content: Effects of content type, exposure time and gender

Authors
Melo, M; Vasconcelos Raposo, J; Bessa, M;

Publication
Computers & Graphics

Abstract

2018

The effects of body position on Reflexive Motor Acts and the sense of presence in virtual environments

Authors
Bessa, M; Melo, M; Augusto de Sousa, AA; Vasconcelos Raposo, J;

Publication
Computers and Graphics (Pergamon)

Abstract
The purpose of this study was to measure the subject's sense of presence while they performed a task (riding a bicycle downhill) in a virtual reality (VR) environment and to compare it by body position (standing vs. sitting) and gender. The sample consisted of 35 subjects (19 male and 16 female) between 17 and 33 years of age. A translated and validated Portuguese version of the Igroup Presence Questionnaire (IPQp) and the Reflexive Motor Acts (RMAs), based on direct observation, were used as metrics. The results showed significant differences between body position at the level of Experienced Realism, Spatial Presence and Overall Sense of Presence. When measuring RMAs, it was demonstrated that people in the sitting position presented a higher frequency. We concluded that body position influences perceptions of credibility, which has an impact on the sense of presence. No differences were identified between the genders. © 2017 Elsevier Ltd