A Gene Mutation May Trap the Brain in the Wrong Reality in Schizophrenia Patients
A newly identified gene mutation may help explain why schizophrenia patients struggle to update their understanding of reality, according to research from MIT and Tufts University published in April 2026.
The Research
Researchers at MIT, led by Guoping Feng and Michael Halassa, investigated why people with schizophrenia often have difficulty integrating new information into their existing beliefs. They focused on a gene called grin2a, which had been flagged in previous genetic studies of schizophrenia. Using whole-exome sequencing, the team analyzed around 25,000 sequences from people with schizophrenia and 100,000 from control subjects, identifying 10 genes where mutations significantly increase schizophrenia risk.
To understand how the grin2a mutation affects brain function, the researchers created mice carrying this mutation. Tingting Zhou, a research scientist at MIT’s McGovern Institute, designed a task where mice had to choose between two levers to receive a reward. The mice with the mutation showed slower decision-making and stuck with outdated choices even when conditions changed, mimicking the cognitive rigidity seen in schizophrenia.
The team pinpointed the issue to a specific brain circuit connecting the thalamus and prefrontal cortex. This pathway is crucial for flexible decision-making and updating beliefs based on new sensory input. By reactivating this circuit, the researchers were able to restore normal behavior in the mice, suggesting a potential target for future therapies.
Why It Matters
This research highlights how our brains constantly update our understanding of reality by balancing prior beliefs with new information. For people with schizophrenia, this process can be disrupted, leading to a disconnect from reality. The study offers a concrete explanation at the genetic and circuit level, moving beyond vague descriptions of symptoms.
For anyone interested in cognitive health, this underscores the importance of mental flexibility—the ability to adapt thinking when faced with new evidence. While schizophrenia is a complex disorder, understanding these mechanisms can inform broader strategies for maintaining cognitive agility.
What You Can Do
To support your brain’s ability to update beliefs and stay mentally flexible:
- Practice tasks that require adapting to changing rules, like strategy games or puzzles.
- Engage in activities that expose you to new information and perspectives, such as reading diverse materials or learning a new skill.
- Stay curious and question your assumptions regularly to keep your thinking adaptable.
Source: ScienceDaily Mind & Brain
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