Research suggests ultrasound treatment reduces delusion severity in schizophrenia patients — Evidence Review
Published in npj Acoustics, by researchers from New York University Grossman School of Medicine, University of Pittsburgh School of Medicine
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Table of Contents
A small clinical trial suggests that transcranial ultrasound stimulation may reduce the severity of delusions in people with schizophrenia, with effects lasting at least a week. Related research generally supports the promise of noninvasive ultrasound techniques for modulating brain activity in psychiatric disorders, though larger studies are needed to confirm efficacy. The findings, published in npj Acoustics, align with a growing body of evidence for ultrasound neuromodulation’s safety and potential benefits.
- Several recent studies indicate that low-intensity transcranial ultrasound can reduce both positive and negative symptoms in schizophrenia and other psychiatric disorders, by modulating brain circuits with high spatial precision 1 2 3 4 5.
- Clinical reviews and systematic analyses highlight that ultrasound stimulation is noninvasive, can target deep brain regions more accurately than techniques like transcranial magnetic stimulation (TMS), and has shown preliminary safety and efficacy in diverse neuropsychiatric cohorts 3 5 13.
- While existing randomized controlled trials and reviews support the neuromodulatory potential of ultrasound, most studies have been small or preliminary, and robust evidence for specific symptom domains (e.g., delusions vs. hallucinations) is still emerging 1 4 5 13.
Study Overview and Key Findings
Schizophrenia remains a challenging psychiatric disorder to treat, particularly when patients experience persistent delusions that are resistant to medication. Antipsychotic drugs often cause significant side effects, and noninvasive brain stimulation methods—such as TMS—are limited in their ability to reach deep brain structures implicated in psychosis. This new pilot study addresses these challenges by evaluating whether transcranial ultrasound stimulation, a technology capable of targeting subcortical circuits, can offer symptom relief for delusions.
Unlike many earlier studies that focused on hallucinations or negative symptoms, this trial specifically targeted the cortico-striatal-pallido-thalamic circuit, choosing the globus pallidus internus as an intervention site. By doing so, the researchers aimed to modulate brain pathways thought to be involved in filtering relevant from irrelevant environmental signals, a process that may be disrupted in psychosis.
| Property | Value |
|---|---|
| Study Year | 2023 |
| Organization | New York University Grossman School of Medicine, University of Pittsburgh School of Medicine |
| Journal Name | npj Acoustics |
| Authors | Dr. Donald Goff, Shy Shoham, Dr. Wei Qi, Dr. Deepak Sarpal |
| Population | Patients with schizophrenia or schizoaffective disorder |
| Sample Size | 10 patients |
| Methods | Non-randomized Controlled Trial (Non-RCT) |
| Outcome | Severity of delusions, cognitive state, auditory hallucinations |
| Results | Ultrasound treatment reduced delusions severity for at least a week. |
Literature Review: Related Studies
To situate these findings within the broader field, we searched the Consensus research database, which contains over 200 million scientific papers. The following search queries were used to identify relevant literature:
- ultrasound therapy schizophrenia delusions
- brain stimulation delusions treatment effectiveness
- transcranial ultrasound mental health outcomes
The literature reveals several key thematic questions:
| Topic | Key Findings |
|---|---|
| How effective is transcranial ultrasound stimulation for schizophrenia symptoms? | - Multiple studies show that low-intensity transcranial ultrasound can reduce negative and positive symptoms, including delusions and hallucinations, in patients with schizophrenia 1 4. - Early-phase clinical data suggest ultrasound is well-tolerated and can modulate brain circuits associated with psychiatric symptoms 3 5 13. |
| How does ultrasound compare to other noninvasive brain stimulation techniques? | - Ultrasound offers enhanced spatial precision and can target deeper brain structures than TMS or tDCS, enabling direct modulation of subcortical regions implicated in psychosis 3 4 5 13. - Systematic reviews indicate that while TMS and tDCS show mixed or moderate efficacy, ultrasound may overcome some of their limitations 3 7 10. |
| What are the safety and tolerability profiles of transcranial ultrasound? | - Reviews and clinical trials report that ultrasound neuromodulation is generally safe, with mild and transient side effects such as headache or fatigue 13 14 15. - No severe adverse events have been reported in studies to date, though larger trials are needed to confirm safety 13 15. |
| What is known about the mechanisms and neural targets for ultrasound neuromodulation in psychiatry? | - Focused ultrasound can induce neuroplastic changes and alter functional connectivity in targeted brain networks, such as the prefrontal cortex, striatum, and amygdala, supporting its potential for treating psychiatric symptoms 1 2 4 12 15. - Research suggests that specific brain circuits related to excitation-inhibition imbalance are promising targets for symptom reduction 2 4 15. |
How effective is transcranial ultrasound stimulation for schizophrenia symptoms?
Recent studies provide growing evidence that transcranial ultrasound stimulation can alleviate a range of schizophrenia symptoms, including both negative symptoms (such as social withdrawal) and positive symptoms (such as delusions and hallucinations). These effects have been observed in small clinical trials and pilot studies, though most research to date is preliminary and involves modest sample sizes. The new study's finding that delusion severity was reduced for at least a week aligns with this emerging literature.
- Low-intensity transcranial ultrasound was shown to induce LTP-like plasticity and reduce negative symptoms in clinical trials of schizophrenia, supporting efficacy in symptom modulation 1.
- Focused ultrasound targeting striatal circuits reduced auditory hallucinations and improved functional connectivity in schizophrenia patients 4.
- Systematic reviews note that ultrasound can modulate brain activity and behavior, but call for larger, controlled studies to establish clinical effectiveness 13.
- The present study is among the first to report specific effects on delusions, expanding the symptom domains evaluated in prior ultrasound neuromodulation research 1 4 13.
How does ultrasound compare to other noninvasive brain stimulation techniques?
While TMS and tDCS have been explored for schizophrenia treatment, their ability to reach deep brain regions is limited. Ultrasound offers millimeter-level spatial resolution and can noninvasively target subcortical circuits implicated in psychosis, such as the striatum and globus pallidus. The new study leverages this unique capability, targeting the cortico-striatal-pallido-thalamic network for delusion reduction.
- Reviews highlight that ultrasound achieves greater specificity and depth than TMS or tDCS, potentially enabling more precise modulation of psychiatric circuits 3 5 13.
- Meta-analyses of TMS and tDCS in schizophrenia show mixed results, particularly for positive symptoms like delusions, suggesting the need for alternative approaches 7 10.
- The ability of ultrasound to target deep brain structures distinguishes it from conventional noninvasive stimulation, which mainly affects cortical areas 3 4 5 13.
- Early clinical data suggest that ultrasound may address some limitations of other neuromodulation methods for treatment-resistant symptoms 5 10.
What are the safety and tolerability profiles of transcranial ultrasound?
Safety is a critical consideration for any neuromodulation therapy. Transcranial ultrasound stimulation has generally been well-tolerated in human studies, with only mild, transient side effects reported. The new study's observation of fatigue and headache in some patients is consistent with prior literature, which has not identified severe adverse events to date.
- Systematic reviews report mild side effects (headache, cognitive changes) in a small percentage of subjects, with no serious adverse events 13.
- Pilot studies in depression and mood disorders also found TUS to be well-tolerated, with positive effects on mood and global affect 14 15.
- The tolerability profile supports continued research but underscores the importance of further safety monitoring in larger cohorts 13 15.
- The absence of major adverse events distinguishes ultrasound from more invasive interventions, such as deep brain stimulation with implanted electrodes 13 15.
What is known about the mechanisms and neural targets for ultrasound neuromodulation in psychiatry?
Research indicates that ultrasound can induce neuroplasticity and modify activity in targeted brain networks. Studies have shown changes in cortical excitability, functional connectivity, and symptom-related neural activity following ultrasound stimulation. The new study’s focus on the cortico-striatal-pallido-thalamic circuit is grounded in existing evidence that excitation-inhibition imbalances in these pathways underlie psychotic symptoms.
- Ultrasound-induced neuroplasticity has been observed in both cortical and subcortical targets, such as the motor cortex, prefrontal cortex, and amygdala 1 2 12 15.
- Preclinical studies demonstrate that ultrasound can regulate NMDA receptor activity and c-Fos expression, supporting mechanistic links to symptom improvement 2.
- Functional imaging studies show that ultrasound can alter connectivity and reduce hyperactivity in psychiatric circuits 4 12 15.
- The choice of deeper targets like the globus pallidus is informed by prior findings of abnormal network connectivity in schizophrenia 4 15.
Future Research Questions
While initial results are promising, further research is needed to validate the efficacy and clarify the mechanisms of ultrasound neuromodulation for schizophrenia. Larger, randomized controlled trials, longer follow-up periods, and direct comparisons with other brain stimulation modalities are critical for translating these findings into clinical practice.
| Research Question | Relevance |
|---|---|
| What is the efficacy of transcranial ultrasound stimulation for delusions in larger randomized controlled trials? | Larger RCTs are needed to confirm the preliminary findings of symptom reduction and to determine the generalizability of effects across diverse schizophrenia populations 1 4 13. |
| How does transcranial ultrasound compare to TMS and tDCS in treating schizophrenia symptoms? | Comparative studies will help clarify the relative advantages of ultrasound, such as depth of target and symptom specificity, and address whether it offers superior outcomes or safety profiles compared to established neuromodulation techniques 3 7 10 13. |
| What are the long-term effects and durability of transcranial ultrasound treatment for psychosis? | Most studies to date have only assessed short-term outcomes (days to weeks). Understanding whether symptom improvements persist or require maintenance sessions is essential for clinical translation 5 13 14. |
| Which brain circuits and parameters are optimal for ultrasound neuromodulation in schizophrenia? | Identifying the most effective neural targets, frequencies, and stimulation protocols will maximize therapeutic benefits and minimize risks, as highlighted in reviews calling for standardization 3 4 5 13 15. |
| What are the mechanisms underlying ultrasound-induced symptom improvement in schizophrenia? | Mechanistic research can inform future treatment development and help tailor interventions to individual patient profiles by elucidating how ultrasound influences brain circuits involved in psychosis 2 12 15. |