The objects were displayed on a computer screen and participants made selections by pressing buttons on hand-held controllers.
When stimulation was provided in the substantia nigra following reward, participants tended to repeat the button press that resulted in a reward. “This is the first study to demonstrate in humans that electrical stimulation near these neurons can modify the learning process,” said Gordon Baltuch, a professor of neurosurgery at University of Pennsylvania. The report was published in the Journal of Neuroscience. (IANS)