The human subthalamic nucleus and globus pallidus internus differentially encode reward during action control.

Published: February 2nd, 2017

Category: News and Events

Congratulations to Drs. Foote and Okun on the publication of “The human subthalamic nucleus and globus pallidus internus differentially encode reward during action control,” which was published in Human Brain Mapping’s January edition.  Click the link to see the article or read the abstract below.

Abstract

The subthalamic nucleus (STN) and globus pallidus internus (GPi) have recently been shown to encode reward, but few studies have been performed in humans. We investigated STN and GPi encoding of reward and loss (i.e., valence) in humans with Parkinson’s disease. To test the hypothesis that STN and GPi neurons would change their firing rate in response to reward- and loss-related stimuli, we recorded the activity of individual neurons while participants performed a behavioral task. In the task, action choices were associated with potential rewarding, punitive, or neutral outcomes. We found that STN and GPi neurons encode valence-related information during action control, but the proportion of valence-responsive neurons was greater in the STN compared to the GPi. In the STN, reward-related stimuli mobilized a greater proportion of neurons than loss-related stimuli. We also found surprising limbic overlap with the sensorimotor regions in both the STN and GPi, and this overlap was greater than has been previously reported. These findings may help to explain alterations in limbic function that have been observed following deep brain stimulation therapy of the STN and GPi. Hum Brain Mapp, 2016. © 2016 Wiley Periodicals, Inc.