WorldCat Identities

Jarraya, Mohamed (1974-....).

Works: 5 works in 8 publications in 1 language and 9 library holdings
Roles: Opponent, Thesis advisor, Author
Publication Timeline
Most widely held works by Mohamed Jarraya
Etude de la viabilité des allogreffes cutanées cryopréservées à usage thérapeutique chez le grand brûlé by Sonia Bouchiha-Gaucher( Book )

2 editions published in 2010 in French and held by 3 WorldCat member libraries worldwide

Le but de notre travail était d'étudier la viabilité des allogreffes cutanées cryopréservées à usage thérapeutique. Nous avons tout d'abord mis au point le test de viabilité MTT sur de la peau de donneurs en état de mort encéphalique. Puis nous avons évalué l'impact du milieu de transport (Ringer Lactate versus RPMI) et du cryoprotectant (Glycérol versus DMSO) sur la peau fraîche, conservée à +4°C (à J2 et J7), et cryopréservée. Les échantillons ont fait également l'objet d'analyses histologiques. Enfin, nous avons tenté de corréler la viabilité des allogreffes à l'efficacité de couverture dans un modèle de xénogreffe homme/souris. Nos résultats indiquent que la viabilité de la peau conservée à +4°C est significativement plus élevée avec le RPMI. Nous n'avons pas noté de différence significative entre Glycérol et DMSO. Le modèle de xénogreffe a montré que la peau cryopréservée est rejetée de façon différée par rapport à la peau fraîche mais que le délai de cicatrisation est équivalent
Le rôle des conditions d'observation dans la perception et la mémorisation des mouvements biologiques complexes by Mohamed Jarraya( Book )

2 editions published in 2005 in French and held by 2 WorldCat member libraries worldwide

This thesis examines a question often disregarded in event perception: that of the role of the conditions of observation in the perception and the memorization of complex biological motion. In a first study, we examined up to what point the perception and the memory of biological motion are affected by the conditions of observation and viewpoint change. First, we examined the effect of optical flow on the final memorized posture of a gymnastic movement and the perception of the continuity of this biological motion despite a viewpoint change. We concluded that an observer visually in motion modifies its perception and its memory of a complex biological motion. Second, we examined the effect of priming the final viewpoint and of the type of viewpoint change on the memorization of a complex biological motion. We concluded that spatial orientation of the observer interferes with postural recognition. In a second study, we tried to determine the role of viewpoint and visual displacement of the observer on the perception of a causal event. We concluded that the judgement of contact seems to be influenced by the perceptive constraints related to depth perception but also by the phenomenology of the perception of causality. In conclusion, this thesis highlights the role of the observer (its movement, its orientation in the environment) in the perception and the memorization of complex biological motion
Expertise en sport de balle dans des tâches de poursuite virtuelle : importance de l'implication des processus perceptivo-moteurs by Maroua Mallek( )

2 editions published in 2019 in French and held by 2 WorldCat member libraries worldwide

The aim of this thesis is to identify the perceptual-cognitive and perceptual-motor determinants of expertise in ball sports in virtual environments. Tennis and basketball players with different levels of expertise were tested. To this purpose, the first experimental part contained two perceptual judgment studies and a visuomotor tracking study. Results did not show any difference between experts and non-experts in perceptual judgment tasks, but only in the visuomotor tracking task. Results raise some questions about the role of representations (or internal models) in the development of expertise. Results highlight the importance of perceptual-motor regulations to discriminate expertise. In order to explore more deeply the perceptual-motor process of expertise, a second experimental part involving three experiments was performed using visuomotor tracking tasks. Results reveal higher adaptation and regulation abilities of experts, particularly in the most constraint periods of tracking. This finding highlights that the visuomotor tracking tasks can discriminate expertise in ball sports. The present thesis reveals the potential of virtual environments to test and train perceptual-motor processes of experts
Les déterminants psychobiologiques des activités physiques à risque by Imen Zaghouani( )

1 edition published in 2016 in French and held by 1 WorldCat member library worldwide

Risk-taking behaviors constitute a growing domain, yet not well known. Our research's goal aimed at identifying the psychobiological and emotional determinants of risky physical activities: rally, lifestyle sports, horse riding, golf players and circus artists (N = 507). We compared the temperament and character of young horse riders and young golfers, both in Tunisia and in France. We then compared the telic dominance of participants in different kinds of sports. We also tested changes in emotional states, neuroticism, escape and alexithymia related to risk-taking. Finally, we identified the personality profiles, specifically the telic dominance and sensation seeking and the perceived stress among circus artists. We have followed the evolution of their cortisol level while training and during a show. The results show that the horse riders and golfers have a high score on persistence and harm avoidance. Motor sports imply more risk-taking than lifestyle sports. The rally context allows its followers to decrease their level of negative affect, neuroticism and alexithymia, which contributes to the adoption of reckless behaviors. Circus artists are paratelic, sensation seekers, and perceive a low level of stress; their cortisol level is higher during the show than on a training day. Overall, we could identify the individual differences that would promote involvement in physical activities at risk, while noting the role of motivational, emotional, biological variables and personality factors in the understanding of such a commitment
Effets croisés de l'expertise physique et des caractéristiques des tâches sur la capacité de rotation mentale by Hamdi Habacha( Book )

1 edition published in 2014 in French and held by 1 WorldCat member library worldwide

Research on the involvement of motor processes during mental rotation tasks is not consensual. According to the literature, this lack of consensus seems to be due to differences in the tasks used (type of stimuli, types of judgment, stimuli features) involving different mental strategies. Our aim is to clarify the role of motor processes in mental rotation by studying the effects of sport on mental rotation ability. Specifically, we tried to identify the tasks requirements to highlight selective effects of different sporting activities in a mental rotation task. The results of this work show that the use of body stimuli with a laterality judgment would engage egocentric strategies and embodiment allowing revealing selective effects of sports. Further, theses strategies appear to be affected by the stimuli realism. These results indicate the involvement of motor processes in these tasks
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Audience Level
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Audience level: 0.91 (from 0.78 for Expertise ... to 0.94 for Etude de l ...)

French (8)