Université de Fribourg

No evidence that frontal optical flow affects perceived locomotor speed and locomotor biomechanics when running on a treadmill

Caramenti, Martina ; Lafortuna, Claudio L. ; Mugellini, Elena ; Khaled, Omar Abou ; Bresciani, Jean-Pierre ; Dubois, Amandine

In: Applied Sciences, 2019, vol. 9, no. 21, p. 4589

We investigated how the presentation and the manipulation of an optical flow while running on a treadmill affect perceived locomotor speed (Experiment 1) and gait parameters (Experiment 2). In Experiment 1, 12 healthy participants were instructed to run at an imposed speed and to focus on their sensorimotor sensations to be able to reproduce this running speed later. After a pause, they had...

Université de Fribourg

Regular physical activity modulates perceived visual speed when running in treadmill-mediated virtual environments

Caramenti, Martina ; Lafortuna, Claudio L. ; Mugellini, Elena ; Khaled, Omar Abou ; Bresciani, Jean-Pierre ; Dubois, Amandine

In: PLOS ONE, 2019, vol. 14, no. 6, p. e0219017

In virtual reality, visual speed is usually underestimated relative to locomotor speed. Here we investigated how physical activity and fitness affect perceived visual speed when running in a treadmill-mediated virtual environment. Thirty healthy participants (ten sedentary individuals, ten team sport players and ten expert runners) ran on a treadmill at two different speeds (8, 12km/h) in...

Université de Fribourg

Matching optical flow to motor speed in virtual reality while running on a treadmill

Caramenti, Martina ; Lafortuna, Claudio L. ; Mugellini, Elena ; Abou Khaled, Omar ; Bresciani, Jean-Pierre ; Dubois, Amandine

In: PLOS ONE, 2018, vol. 13, no. 4, p. e0195781

We investigated how visual and kinaesthetic/efferent information is integrated for speed perception in running. Twelve moderately trained to trained subjects ran on a treadmill at three different speeds (8, 10, 12 km/h) in front of a moving virtual scene. They were asked to match the visual speed of the scene to their running speed–i.e., treadmill’s speed. For each trial, participants...

Université de Fribourg

Gesturing on the steering wheel, a comparison with speech and touch interaction modalities

Angelini, Leonardo ; Baumgartner, Jürgen ; Carrino, Francisco ; Carrino, Stefano ; Caon, Maurizio ; Abou Khaled, Omar ; Sauer, Jürgen ; Lalanne, Denis ; Mugellini, Elena ; Sonderegger, Andreas

(Internal working papers DIUF ; 15-03)

This paper compares an emergent interaction modality for the In-Vehicle Infotainment System (IVIS), i.e., gesturing on the steering wheel, with two more popular modalities in modern cars: touch and speech. We conducted a betweensubjects experiment with 20 participants for each modality to assess the interaction performance with the IVIS and the impact on the driving performance. Moreover, we...

Haute Ecole de Gestion & Tourisme

A Framework for Semantic Business Process Management in E-Government

Liu, Zhan ; Le Calvé, Anne ; Cretton, Fabian ; Evéquoz, Florian ; Mugellini, Elena

In: Proceedings of the IADIS International Conference WWW/INTERNET 2013, 2013, p. 259-267

Nowadays, the increasing complexity in government-related processes presents considerable challenges to achieve satisfactory services. In this study we will discuss the first results obtained in an ongoing project named “e-Government Innovation Center”. We first identify typical semantic problems in e-Government, then introduce an e-Government semantic business process management framework...