Researchers have identified a weakened brain signal that may help explain several symptoms of schizophrenia, from perceptual difficulties to disorganized speech, according to a new study published in Science Advances.
The study, conducted by scientists from McGill University, the University of Montreal, and the Douglas Research Centre, examined beta-band brain activity using magnetoencephalography (MEG). Beta-band activity refers to rhythmic patterns of electrical activity involved in coordinating information processing, perception, and movement.
The researchers compared 25 people diagnosed with schizophrenia against 25 healthy participants. Subjects completed tasks designed to test the accuracy of their timing in visual and auditory information processing, while researchers also analysed their speech for signs of disorganized thinking.
The results showed a striking pattern. People with schizophrenia had weaker and slower beta-band activity. More importantly, those with the most pronounced abnormalities in this brain signal also tended to have greater difficulty with timing, more disorganized speech, and more severe clinical symptoms.
Schizophrenia is a complex psychiatric disorder that can affect how people experience the world, interact with their surroundings, and communicate with others. These symptoms are typically studied as separate features of the condition, but the new findings suggest that a shared underlying process may contribute to the disorder's diverse effects.
"This gives us early but compelling evidence that measuring the brain's operations, especially how it builds and revises its own model of the world, may help us appreciate that there is a common thread behind the confusing array of symptoms we see in disorders like schizophrenia," said Dr. Lena Palaniyappan, senior author of the study, Professor of Psychiatry at McGill and director of the Centre of Excellence in Youth Mental Health at the Douglas Hospital.
Hsi (Tiana) Wei, lead author of the study and postdoctoral scholar in McGill's Department of Psychiatry, said, "What struck us was that the same weakened brain signal kept showing up wherever we looked, whether patients were processing a sound, a sight or completing a movement. Seeing the same pattern across these different domains suggested there may be a common underlying process linking the symptoms."
Beyond providing new insight, the findings could eventually help researchers identify young people at greater risk of developing psychosis. The first signs of schizophrenia often appear during adolescence but may go unrecognized for an extended period.
However, the researchers emphasised the results are preliminary. The study included only 50 participants. "This is a first, modest-size study, and the associations with speech and clinical severity will need to be tested in larger independent samples before we can be confident in them," Wei said.
If future studies confirm the findings, measuring beta-band activity could potentially become a useful tool for identifying people who need earlier support, and Wei suggested the brain signal may deserve investigation as a possible target for future schizophrenia treatments.
Analysis
Why This Matters
- Provides a potential unified explanation for schizophrenia's wide-ranging symptoms, shifting perspective from separate features to a common process.
- Could lead to a biological marker for early detection of psychosis in adolescents, enabling earlier support and intervention.
- Points to beta-band activity as a potential target for developing new, more specific treatments.
Background
Schizophrenia is a complex psychiatric disorder affecting around 1% of the population, typically emerging in late adolescence or early adulthood. Current treatments largely target dopamine and often do not address the full range of cognitive and perceptual symptoms. Beta-band brain rhythms (around 15-30 Hz) are involved in maintaining the brain's current state or 'model' of the world, integrating sensory input with predictions. This study used MEG, a technique that measures the magnetic fields from neural activity, to observe these rhythms with high precision.
What to Watch
- Replication studies: Larger independent studies are needed to confirm the association between beta-band disruption and symptom severity.
- Early detection tools: Whether this signal can be measured reliably with accessible technology for youth mental health screening.
- Treatment development: If the mechanism is confirmed, researchers may investigate whether modulating beta-band activity can alleviate symptoms.
Checked
12 claims in this story checked against 1 source: 12 supported.
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- SupportedA brain-signal discovery may explain a range of schizophrenia symptoms.Latest Science News -- ScienceDaily: “Scientists have identified a brain signal that may help explain why schizophrenia produces such a wide variety of symptoms, including difficulties with perception, movement, and speech.”
- SupportedThe study links beta-band activity with timing difficulties, disorganized speech and symptom severity.Latest Science News -- ScienceDaily: “the participants with the most pronounced abnormalities in this brain signal also tended to have greater difficulty processing the timing of sights and sounds, more disorganized speech, and more severe clinical symptoms.”
- SupportedThe findings could eventually help identify young people at greater risk of developing psychosis.Latest Science News -- ScienceDaily: “the findings could eventually help researchers identify young people who are at greater risk of developing psychosis.”
- SupportedThe study was published in Science Advances and was conducted by scientists from McGill University, the University of Montreal and the Douglas Research Centre.Latest Science News -- ScienceDaily: “The study, published in Science Advances, was conducted by scientists from McGill University, the McConnell Brain Imaging Centre, the University of Montreal, the Research Centre of the University of Montreal Health Centre, and the Douglas Research Centre.”
- SupportedThe study compared 25 people diagnosed with schizophrenia with 25 healthy participants and measured beta-band activity using MEG.Latest Science News -- ScienceDaily: “researchers examined beta-band brain activity in 25 people diagnosed with schizophrenia and 25 healthy participants.”
- SupportedParticipants completed visual and auditory timing tasks, and researchers analysed their speech for signs of disorganized thinking.Latest Science News -- ScienceDaily: “Participants completed tasks designed to test how accurately they could judge the timing of visual and auditory information. The researchers also analyzed their speech to look for signs of disorganized thinking and communication.”
- SupportedPeople with schizophrenia showed weaker and slower beta-band activity than the control group.Latest Science News -- ScienceDaily: “People with schizophrenia showed weaker and slower beta-band activity than those in the control group.”
- SupportedPalaniyappan said measuring the brain’s operations may help reveal a common thread behind schizophrenia symptoms.Latest Science News -- ScienceDaily: “This gives us early but compelling evidence that measuring the brain's operations, especially how it builds and revises its own model of the world, may help us appreciate that there is a common thread behind the confusing array of symptoms we see in disorders like schizophrenia,”
- SupportedWei said the same weakened brain signal appeared across sound, sight and movement processing, suggesting a possible common process linking symptoms.Latest Science News -- ScienceDaily: “Seeing the same pattern across these different domains suggested there may be a common underlying process linking the symptoms.”
- SupportedThe study’s results are preliminary, and it included only 50 participants.Latest Science News -- ScienceDaily: “However, the researchers emphasized that the results are preliminary. The study included only 50 participants”
- SupportedWei said the associations with speech and clinical severity need testing in larger independent samples.Latest Science News -- ScienceDaily: “This is a first, modest-size study, and the associations with speech and clinical severity will need to be tested in larger independent samples before we can be confident in them,”
- SupportedWei suggested beta-band activity may warrant investigation as a possible target for future schizophrenia treatments.Latest Science News -- ScienceDaily: “Wei also suggested that the brain signal may deserve investigation as a possible target for future schizophrenia treatments.”