Schizophrenia's Hidden Clues in Brain Structure

Scientists have long been studying the brain's cortico-basal ganglia network to understand schizophrenia. One area of focus is the globus pallidus, a part of the brain that's different in people with schizophrenia. Researchers found that the globus pallidus is larger in people with schizophrenia than in those without it. But what's not well understood is how its two main segments, the externus and internus, are affected.

Researchers compared the volume and function of these segments in over 100 people with schizophrenia and controls. They discovered that the externus segment was larger in people with schizophrenia. They also found specific changes in how these segments connected to other parts of the brain. For example, the left externus segment was more connected to the lateral occipitoparietal area, while the left internus segment was less connected to the precuneus.

But what does this mean for people who don't have schizophrenia but experience psychotic episodes? Researchers looked at over 200 early adolescents who had subclinical psychotic experiences. They found that a larger externus segment was linked to these experiences. They also discovered specific changes in brain connections in adolescents with psychotic experiences. For instance, the left externus segment was more connected to the lingual gyrus in these adolescents.

Understanding how these brain segments work could help scientists figure out what causes schizophrenia. More research is needed to uncover the mechanisms behind these specific neurophysiological roles. By studying the brain's structure and function, researchers hope to develop new treatments for schizophrenia and related disorders.

The study's findings suggest that the globus pallidus plays a critical role in schizophrenia. Its segments, the externus and internus, have distinct functions and connections. The externus segment's larger volume and altered connections may contribute to the development of schizophrenia. Further research is necessary to explore the relationship between the globus pallidus and schizophrenia, and to identify potential therapeutic targets.