Motor Learning

The study is about using a brain stimulation technique called rTMS (Repetitive Transcranial Magnetic Stimulation) to help improve hand muscles in people who had a stroke. Researchers want to understand how this device can help stroke patients use their hands better.

The general purpose of this research project is to analyze the specific role of motor imagery on motor learning, assessed through corticospinal excitability measurements and behavioral data collection. This project is based on four sequences. For Sequence 1, the main objective is to examine the effect of mental training on movement speed and accuracy in a manual motor sequence task, as well as the influence of sensory feedback in immediate post-test (i.e., execution of a similar, but not identical, manual motor sequence, other manual tasks) on performance in delayed post-test. The secondary objective will be to examine corticospinal changes (i.e., amplitude of motor evoked potentials) induced by mental training, by measuring the amplitude of motor evoked potentials before and after mental training. For Sequence 2, the main objective is to examine the impact of a motor disturbance induced by a robotic arm at different intervals during the motor imagery process. The secondary objective will be to examine the corticospinal changes (i.e. amplitude of evoked motor potentials) induced by mental training as a function of the applied perturbations, before and after perturbation. For Sequence 3, the main objective will be to examine the influence of neuroplasticity on the quality of mental training. More specifically, the investigators will study the links between brain plasticity and motor learning through mental training. The secondary objective will be to examine the corticospinal changes (i.e. amplitude of evoked motor potentials) induced by mental training at different levels of the neuromuscular system (cortical, cervicomedullar, peripheral) after a training period. For Sequence 4, the main objective will be to examine the effect of short-term arm-immobilization of on the retention of motor learning induced by mental training. The secondary objective will be to examine the corticospinal changes (i.e., amplitude of motor evoked potentials) induced by of short-term arm-immobilization, or by transcranial direct current stimulation (tDCS), on motor learning. The results of this fundamental research project will allow a better understanding of neurophysiological and behavioral mechanisms that underlie motor learning through motor imagery. The results will allow to efficiently consider inter-individual specificities and will thus open up to clinical research perspectives, towards the establishment of adapted motor rehabilitation protocols.

De novo motor learning is a specific learning paradigm that allows investigation of how a new motor skill is learned from scratch. Motor task learning can induce increased corticospinal excitability and reorganization of connectivity observed within the motor cortex (M1). Several studies have investigated the plasticity mechanisms underlying motor learning using simple paradigms. The results obtained have been variable, with a major trend toward increased corticospinal excitability, while other results show no increase. We expect to observe a significant increase in excitability and enhanced intracortical reorganization mechanisms within M1 in our subjects during our de novo motor learning sessions. The primary objective of this study is to measure changes in corticospinal excitability of the motor system across 3 de novo motor learning sessions separated by different time intervals. The secondary objectives will be: 1) to measure learning across the three practice sessions, 2) to measure changes in inhibition and facilitation across the 3 learning sessions, and 3) to measure correlations between subjects' motor performance and corticospinal and intracortical changes.

The ExSiMS study is a randomized, controlled crossover study including 20 individuals (18-70 years) diagnosed with relapsing remitting Multiple Sclerosis (MS) This project investigates, through behavioral and neurophysiological measurements, how aerobic exercise on an ergometer bike and sleep in the form of a nap and overnight sleep may enhance cortical motor skill learning evaluated by a complex hand motor skill test and thereby improve functional capacity in individuals with MS. Beyond the effect on motor skill learning, the project investigate the effect on electroencephalography (EEG) - electromyography (EMG) coherence. The study hypothesizes that individuals with neurological conditions, such as multiple sclerosis (MS), may experience beneficial effects on specific motor rehabilitation through systematically planned cardiovascular exercise and sleep scheduling, due to positive impacts on memory consolidation. Aims: * Investigate the brain's neurophysiological responses and memory effects following a training intervention and, separately, sleep, in the form of a power nap, in individuals with MS. * Examine whether these effects persist beyond the few days previously observed in healthy individuals by implementing a longer-term intervention. * Explore whether the training effect is influenced by disease activity in the brain, such as during relapses and during immunosuppressive treatment. * Assess whether the presence of abnormally reduced cognitive endurance (fatigue) affects the impact of the intervention involving exercise and sleep. The study is based on documented positive effects of physical activity and sleep in both young and older adults, as well as in individuals recovering from stroke. The research thus offers promising perspectives for broader applications within neurorehabilitation, and particularly for MS, as the disease is associated with functional impairments. At the same time, both physical exercise and sleep represent meaningful interventions that should be thoughtfully integrated into rehabilitation strategies.

The purpose of this research is to investigate the impact of acute pain, induced using an experimental pain paradigm of capsaicin paired with heat, on implicit locomotor learning and its retention in older adults.

There are very few studies in the literature examining the effect of age on motor imagery ability in children with cerebral palsy. To our knowledge, no studies have investigated the impact of other related factors. The aim of this study is to investigate the effects of age, sex, body mass index, Gross Motor Function Classification System (GMFCS) level, and Manual Ability Classification System (MACS) level on motor imagery abilities in children with cerebral palsy. H1-1: Age has an effect on motor imagery abilities in children with cerebral palsy. H1-2: Sex has an effect on motor imagery abilities in children with cerebral palsy. H1-3: Clinical type has an effect on motor imagery abilities in children with cerebral palsy. H1-4: Body mass index has an effect on motor imagery abilities in children with cerebral palsy. H1-5: GMFCS level has an effect on motor imagery abilities in children with cerebral palsy. H1-6: MACS level has an effect on motor imagery abilities in children with cerebral palsy.

Ankle control is essential to safe over-ground navigation for humans. Middle- aged and older adults and patients with stroke whose ankle control is poor often lose their balance or fall. Transcranial direct current stimulation (tDCS) is an emerging non-invasive brain stimulation technology that has great potential to be applied to neurorehabilitation; however, the optimization of its applications still needs further studies. The aims of this project are to compare the effects of anodal tDCS (AtDCS) applied to the primary motor cortex (M1) contralateral to the moving leg (cM1), posterior parietal cortex (PPC) contralateral to the moving leg (cPPC), and cerebellar cortex (CBM) ipsilateral to the moving leg (iCBM) on motor learning, motor adaptation, and brain connectivity in healthy middle-aged and older adults and hemiparetic patients with chronic subcortical stroke.