Axes de recherche
Stratégies techno-cognitive contre la plasticité inadaptée
La plupart d'entre nous organisent de manière cohérente les mouvements et les informations somatosensorielles, suggérant l'existence d'une interaction bidirectionnelle entre la représentation du corps et le système de traitement sensoriel au niveau du système nerveux central. Cependant, la rupture de la communication entre le cerveau et le corps, notamment, suite à une lésion de la moelle épinière, peut affecter radicalement la manière dont le corps est perçu et représenté. En fait, l'état actuel de la représentation du corps suite à une lésion de la moelle épinière reste largement inexploré. Dans ce projet, nous quantifierons les effets de la perte partielle et totale de l'information périphérique (lésion totale ou partielles de la moelle épinière) sur différents aspects de la représentation corporelle.
En plus, les données actuelles sur les bénéfices de la thérapie automatisée au cours de la réhabilitation sensorimotrice conventionnelle sont controversées. Cette incohérence peut être due au manque de contrôle cognitif impliqué dans l'intervention de l'aide robotique standard (passif). Afin de remédier à cette limitation, ce projet combinera différentes solutions technologiques (p. ex. exosquelette) avec un réentraînement cognitif (p. ex. une simulation mentale de mouvements) pour établir un bénéfice bidirectionnel entre les traitements isolés actuels.
Visuo-tactile integration and sense of embodiment
The rubber hand illusion is an experimental protocol wherein the feeling of body ownership is manipulated via spatio-temporal congruency between visual (seen, but not felt, touch) and tactile sensory input (felt, but not seen, touch). However, the specific relationship between multisensory perception and body ownership is still to be understood. In the present project, participants' brain activity will be recorded through functional magnetic resonance during the perception and not of the rubber hand illusion.
Aim:
To associate brain activity and/or connectivity during a rubber hand experiment and scores of perceived hand ownership.
Experimental Approach:
The applicant will analyze fMRI data in terms of brain activity and/or functional connectivity. The applicant will then also collaborate with the experimental setup in the MR environment and with the support during fMRI data acquisition. The applicant will analyze questionnaires of subject ownership and then associate the scores with neuroimaging features. The applicant will be also involved in recruiting participants and writing a study report. Elementary knowledge in MATLAB and/or R is recommended, but not a requirement.
VR technology and human visuo-motor integration
Over a century of animal research investigated the neurophysiological basis of the influence of sensory perception on movement execution. In humans, behavioral observations show that alterations or interruption of visual input can affect motor performance. However, whether and how sensory input affects the execution of movements remains an open question.
Aim: (1) Evaluating the putative role of signals from sensory regions of the brain on movement execution. (2) Possible extension to eventual differences between neurotypical and neuropathic populations.
Experimental Approach:
The student will be trained in using brain stimulation and virtual reality to record data from healthy volunteers, with possible extension to clinical populations. The obtained results will be considered for publication in a scientific journal.
Vision and mental representation of movements
In everyday life, we continuously simulate the sequences of movements in order to predict the possible outcome of our actions to reach our goals. Despite our sensory perception (especially vision) has clear influences on the execution of our movements, the relationship between perception and the simulation of movements remains largely unexplored.
Aim:
Pushing forward previous work, this project aims at investigating the role of vision on mental simulation of movements.
Experimental Approach:
The student will record response time and accuracy from a sample of healthy participants in different vision conditions, with eventual extension to clinical populations.
Consciousness and body representation
Body representation can be manipulated through the rubber-hand illusion experiment, in which a person does not see his/her own being touched but instead sees an artificial hand being touched at the same time. Eventually, the artificial hand might be perceived as being his/her own, but sometimes this feeling is only processed unconsciously. However, an objective method to measure unconscious aspects of the rubber hand illusion are still under investigation.
Aim:
This work will evaluate associations between implicit (unconscious) measures of changes in ownership and neural changes in the brain of healthy individuals.
Experimental Approach:
Participants' brain activity will be recorded through functional magnetic resonance imaging (fMRI). The master student will help with data recording and analysis. S/he will also collaborate with experimental setup, will be involved in recruiting participants, and will write a study report. It is recommended to the applicant to have previous knowledge in MATLAB and/or R, but not a requirement.
Visuo-Tactile Integration and Body Ownership in Humans
How to grab an object? How to understand that the hand grabbing the object is ours? The spatio-temporal relationship between vision and touch is essential for object manipulation, as well as to create the sense of body ownership ("this hand is my hand"). However, the basic mechanisms are still under investigation.
Aim:
This study will reveal the causal role of the integration of visual and tactile information as well as in the attribution of self body-ownership of body parts.
Experimental Approach:
The student will learn how to use specific experimental setups able to manipulate the sense of body ownership via visuo-tactile integration healthy human volunteers.
