Weaker beta-band brain signal links to the varied symptoms of schizophrenia, study finds

The finding

Scientists identified a brain signal that may help explain why schizophrenia produces a wide variety of symptoms, including difficulties with perception, movement, and speech ^[1]. The work matters to people living with schizophrenia and to anyone following research into the condition. The study was published in Science Advances ^[1].

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 conducted it ^[1].

What beta-band activity is

Beta-band activity refers to rhythmic patterns of electrical activity in the brain involved in coordinating information processing, perception, and movement ^[1]. It is also described as involved in how the brain coordinates information and updates expectations ^[2].

That job matters because the brain constantly uses incoming sensory information to develop and update its understanding of the surrounding environment ^[1].

How the study worked

The study examined beta-band brain activity in 25 people diagnosed with schizophrenia and 25 healthy participants ^[1]. The researchers used high-resolution magnetoencephalography (MEG) to measure brain activity ^[1]. The scans were performed at the McConnell Brain Imaging Centre at the Montreal Neurological Institute-Hospital (The Neuro) ^[1].

MEG detects the tiny magnetic fields generated by electrical activity in the brain ^[1]. It can reveal changes in timing that are difficult to capture with other methods ^[2].

Participants completed tasks designed to test how accurately they could judge the timing of visual and auditory information ^[1]. Researchers also analyzed participants' speech to look for signs of disorganized thinking and communication ^[1].

What the scans showed

People with schizophrenia showed weaker and slower beta-band activity than those in the control group ^[1]. Participants with the most pronounced abnormalities in the signal also tended to have greater difficulty processing the timing of sights and sounds, more disorganized speech, and more severe clinical symptoms ^[1].

Patients with the largest differences in the signal tended to show more severe impairments across all three domains ^[3].

Lead author Hsi (Tiana) Wei said the same weakened brain signal appeared whether patients were processing a sound, a sight, or completing a movement ^[1]. Senior author Lena Palaniyappan said the findings are early but compelling evidence of a common thread behind the symptoms seen in disorders like schizophrenia ^[1].

Why early detection is the goal

The first signs of schizophrenia often appear during adolescence but may go unrecognized for an extended period ^[1]. The findings could eventually help researchers identify young people at greater risk of developing psychosis ^[1]. Psychosis involves a disruption in how someone perceives or interprets reality and can include hallucinations or delusions ^[1].

Palaniyappan said that if the finding is confirmed in larger samples, it may be a useful method to identify youth seeking mental health help who need extra support to prevent psychosis ^[1]. Wei suggested the brain signal may deserve investigation as a possible target for future schizophrenia treatments ^[1].