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Details

  • Name

    José Vasconcelos Raposo
  • Cluster

    Computer Science
  • Role

    Research Coordinator
  • Since

    01st April 2015
Publications

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, A; 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

2017

Monoamines and cortisol as potential mediators of the relationship between exercise and depressive symptoms

Authors
Carneiro, LSF; Mota, MP; Vieira Coelho, MA; Alves, RC; Fonseca, AM; Vasconcelos Raposo, J;

Publication
EUROPEAN ARCHIVES OF PSYCHIATRY AND CLINICAL NEUROSCIENCE

Abstract
A randomized controlled trial was conducted to assess the effects of exercise plus pharmacotherapy on monoamine neurotransmitters (dopamine, noradrenaline, adrenaline, serotonin) and cortisol levels. A total of 26 women with clinical depression were randomly assigned to one of the two groups: aerobic exercise plus pharmacotherapy or only pharmacotherapy. The exercise program consisted of aerobic exercise, 45-50 min/session, three times/week, for 16 weeks. The biological parameters were measured before and after the exercise program. Adding exercise to pharmacotherapy had no additional effects on monoamines and cortisol plasma levels. These data are preliminary outcomes from a small sample and should be replicated.

2017

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

2017

Sexual satisfaction in patients with cancer [Satisfação sexual em pacientes com cancer] [Satisfacción sexual en enfermos de cáncer]

Authors
Vasconcelos Raposo, J; Moreira, TL; Arbinaga, F; Teixeira, CM;

Publication
Acta Colombiana de Psicologia

Abstract
This study aimed to compare the dimensions of sexual satisfaction in subjects with and without cancer. Independent variables were: different types of cancer, time elapsed since diagnosis, types of treatment and changes in body image. The dependent variable was level of satisfaction with sexual relations. The sample consisted of 184 participants, of whom 95 belonged to the cancer group (ages between 26 and 84 years) and 89 to the non-cancer group (ages between 19 and 67 years). The instrument used was the Sexual Satisfaction Questionnaire (QSRS, for its Portuguese acronym). The results showed significant differences between the cancer group and the non-cancer group. Individuals with a history of cancer disease had lower values (17.93 ± 9.67) at the level of sexual function compared to individuals with no history of the disease (30.19 ± 4.2). Individuals with cancer who had higher values of self-esteem were those with urological cancer (16.76 ± 2.85), followed by breast cancer (14.83 ± 3.34) and “other cancers” (14.41 ± 5.5), whereas those with digestive cancer presented the lowest values (5.68 ± 13.63). In sexual functioning, the group of “other cancers” showed the highest levels of satisfaction (23.53 ± 10.12), while people with breast cancer (19.54 ± 9.36), digestive cancer (18.50 ± 12.57), and urological cancer (29.12 ± 7.22) presented the lowest levels of satisfaction. Within the group of people with cancer, those who had less than one year and between three to five years of having been diagnosed reflected less satisfactory sexual performance values. On the other hand, radiation treatments, surgery and “other treatments” showed negative effects on sexual functioning, as well as changes in body image. All independent variables had a negative impact on sexual satisfaction and performance, with the exception of weight loss, vomiting, and hair loss.

2016

Adaptation and Validation of the Igroup Presence Questionnaire (IPQ) in a Portuguese Sample

Authors
Vasconcelos Raposo, J; Bessa, M; Melo, M; Barbosa, L; Rodrigues, R; Teixeira, CM; Cabral, L; Sousa, AA;

Publication
PRESENCE-TELEOPERATORS AND VIRTUAL ENVIRONMENTS

Abstract
The present study aims (a) to translate and adapt the Igroup Presence Questionnaire (IPQ) to the Portuguese context (semantic equivalence/ conceptual and content validity) and (b) to examine its psychometric properties (reliability and factorial validity). The sample consisted of 478 subjects (285 males and 193 females). The fidelity of the factors varied between 0.53 and 0.83. The confirmatory factor analysis results produced a 14-item version of IPQ-PT, accepting covariance between residual errors of some items of the instrument, as the best structural representation of the data analyzed. The CFA was conducted based on a three-variable model. The fit indexes obtained were X-2/df = 2.647, GFI = .948, CFI = .941, RSMEA = .059, and AIC = 254. These values demonstrate that the proposed Portuguese translation of the IPQ maintains its original validity, demonstrating it to be a robust questionnaire to measure the sense of presence in virtual reality studies. It is therefore recommended for use in presence research when using Portuguese samples.