Rosario Moratalla is a Professor of Neuroscience, Director of the Center of Interdisciplinary Research and Vice-Chair at the Cajal Institute, Consejo Superior de Investigaciones Científicas, Madrid. Dr. Moratalla's research interests lie on the dopaminergic system and its role in drug abuse and Parkinson's disease. She is interested in the molecular mechanisms that modulate cellular responses in the basal ganglia motor circuit, in the context of Parkinson's disease, L-DOPA-induced dyskinesia and impulse control disorders and drug abuse. In relationship with Parkinson's disease, her studies intend to determine the neurobiological correlates of dyskinesias induced by antiparkinsonian therapy, as well as to establish the neuronal circuits involved in non-motor symptoms of Parkinson's disease. Gustavo Murer is Professor and Chair of the Institute of Physiology and Biophysics "Bernardo Houssay" at the University of Buenos Aires School of Medicine. Dr. Murer is an expert on the functional alterations that take place in the basal ganglia in Parkinson's disease and other basal ganglia related disorders. His research focuses on the electrophysiological and morphological alterations that take place in the striatum in animal models of Parkinson's disease. His recent investigations examine how chronic dopamine depletion and dopamine replacement therapy produce changes in the activity of basal ganglia neurons, which molecular mechanisms underlie these changes, and how they modify basal ganglia function and behavior.