Striatonigral Pathway (IMAGE) Columbia University Irving Medical Center Caption In a recent study, Columbia researchers have investigated why dyskinesias occur in Parkinson's disease patients: they identified a major change in the function of striatonigral GABA synapses in the basal ganglia, a brain circuit that controls movement. Pictured here in green is the striatonigral pathway. Credit Columbia University Medical Center/Borgkvist et al./<i>Neuron</i> 2015 Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.