In early psychosis, brain glutamate levels moved together across regions

A high-field brain scan study found coordinated glutamate patterns in people experiencing psychosis for the first time, despite no clear differences in levels within individual regions.

Editorial illustration — not from the study.

Researchers used 7-tesla proton magnetic resonance spectroscopy to measure glutamate in five brain regions in 47 people with first-episode psychosis who were not taking antipsychotic medication, and in 21 healthy controls. The regions were the anterior cingulate cortex, dorsolateral prefrontal cortex, basal ganglia, hippocampus and thalamus.

Glutamate concentrations did not differ between the groups in the main analyses. But in exploratory analyses, glutamate levels were significantly correlated across six of 10 pairs of regions in the psychosis group, with correlations ranging from 0.3 to 0.4; this pattern was not seen in the controls. Four of these correlations were associated with the severity of positive symptoms, such as hallucinations or delusions, although the abstract does not report the size or direction of those associations.

Glutamate patterns across regions

The study found no group differences in glutamate concentration in any of the five brain regions; all reported p-values were above 0.2. A possible association between glutamate in the basal ganglia and negative symptoms did not remain significant after correcting for multiple comparisons.

In contrast, people with first-episode psychosis showed significant correlations between glutamate levels in six of 10 pairs of regions, spanning cortical and deeper brain structures. The correlations ranged from 0.3 to 0.4, with p-values from 0.01 to 0.04. Four of these regional relationships were associated with positive symptom severity, with p-values from 0.03 to 0.05.

Why the pattern matters

The findings suggest that early psychosis may involve differences in how glutamate levels are coordinated across brain regions, rather than simply higher or lower glutamate in one region. If confirmed, measures of these cross-region relationships could complement measurements of regional glutamate concentration and help guide research into treatments that target glutamate-related signaling.

Evidence and caveats

This was a 7-tesla magnetic resonance spectroscopy comparison of 47 people with antipsychotic-free first-episode psychosis and 21 healthy controls. The main analyses did not support the expected regional concentration differences. The cross-region correlations and their links with symptoms came from exploratory analyses, so they need confirmation in further studies. The abstract does not establish that the glutamate patterns cause psychosis or show whether they change with illness or treatment.

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