Stéphane Lehéricy has been very active in the field of basal ganglia research using functional MRI and DTI. His work was focused on the functional and anatomical organization of the basal ganglia. Together with his colleagues Marie Vidailhet, M.D., Ph.D. (neurologist, specialist in movement disorder in the Pitié-Salpêtrière Hospital) and Sabine Meunier , M.D., Ph.D. (specialist in neurophysiology and TMS, INSERM, Pitié-Salpêtrière Hospital), they have a long standing expertise in dystonia research. They published several clinical, anatomical, functional and TMS studies in patients with primary and secondary dystonia.

I received the Ph.D. degree in physics from the Université Paris 11, Orsay. I spent one year as a Research Assistant at the Max-Planck Institute of Cognitive Neuroscience (now Max-Planck Institute for Human Cognitive and Brain Sciences) in Leipzig, Germany, where I specialized in statistical processing of fMRI data. In 2000, I became a Research Engineer at Inserm. Since 2005, I have been working at the Laboratoire d'Imagerie Fonctionnelle (UMR_S 678 Inserm/University of Paris 6) in Paris. My research interests include signal and image processing of fMRI and DTI data for the analysis of functional and anatomical connectivities. I am also concerned with the integration of home-made procedures in the BrainVISA software environment.

I am a new PhD student in the Odyssée team, INRIA, Sophia Antipolis, under the supervision of Dr. Rachid Deriche.During my internship I worked on estimating 4th order tensors to describe the diffusion signal in D-MRI. My work was centered around exploring the set of 4th order tensors and generalizing the Riemannian gradient descent approach, which guarantees positive definite tensors and had been developed for 2nd order DTI, to 4th order estimation. For that I studied the symmetries of the 4th order diffusion tensor, and ways to compute the ADC from there.