In a recent study, University of Iowa researchers identified a brain region that plays a crucial role in how humans adjust their thoughts and focus when faced with distractions.
This finding is significant as it sheds light on the cognitive and behavioral side effects of a treatment commonly used for Parkinson’s disease.
The study, titled “The human subthalamic nucleus transiently inhibits active attentional processes,” was published online on March 4 in the journal Brain. The study highlights the role of the subthalamic nucleus, a small brain region responsible for regulating movements.
In Parkinson’s patients, this region is thought to be overly active. Researchers suggest that this hyperactivity may contribute to the tremors and other motor issues associated with the disease.
Doctors have recently begun employing deep-brain stimulation to treat Parkinson’s disease patients
Doctors have recently begun employing deep-brain stimulation to treat Parkinson’s disease patients. This entails inserting electrodes into the subthalamic nucleus, a brain region that regulates movement, to generate electrical signals and loosen its control, allowing for improved movement. Once implanted, the deep brain stimulation technology functions continuously, much like a pacemaker for the heart.
Jan Wessel, an associate professor at the University of Iowa, called the procedure “truly miraculous.” It frequently provides instant relief from tremors, allowing patients to perform things such as playing golf calmly.
However, some patients treated with deep brain stimulation have difficulty with concentration and impulse control, which can lead to dangerous behaviors such as gambling or using drugs. Researchers began to question if the subthalamic nucleus, which regulates movement, also impacts cognition and impulse control.
To investigate this, Wessel’s team tested Parkinson’s patients with and without deep brain stimulation. Participants were instructed to focus on a computer screen while their brain waves were recorded. When participants heard a chirping sound designed to divert their attention, their brain waves in the visual cortex fell, indicating a shift in attention.
However, when Parkinson’s patients were shown the chirp while deep brain stimulation was engaged, their visual attention was not diverted.
The team saw that they were unable to deflect or suppress their focus of attention as they had previously. Despite the unexpected sound, they remained fully focused on their visual system, not diverting their attention.
This discovery emphasizes the function of the subthalamic nucleus in not just coordinating movement, as previously considered, but also in controlling thoughts and attention.
