The goal of this clinical trial is to investigate if new, early biomarkers of the disease are available in presymptomatic genetic carriers of Huntington\'s diesase compared to healthy subjects. The main questions it aims to answer are: Does functional brain MRI is able to detect early biomarkers of the disease in genetic carriers? Does gait study by a virtual reality device can detect early biomarkers of the disease in genetic carriers? Researchers will compare genetic carriers and healthy subjects to see if new, early biomarkers of the disease can be detected .