Can Brain Stimulation Help Quiet the “Voices”?

A Clear Look at TMS & tDCS for Auditory Hallucinations

Auditory hallucinations—hearing voices no one else can hear—remain one of the most challenging and emotionally draining symptoms for people living with schizophrenia and schizoaffective disorder. For many, these voices are critical, distressing, commanding, or simply relentless. They interrupt sleep, daily functioning, relationships, and a person’s sense of safety.

As clinicians, we often rely on antipsychotic medications to bring relief. Yet up to one-third of patients continue to hear voices even after multiple medication trials, and many struggle with significant side effects like weight gain, metabolic changes, or movement symptoms. Because of this ongoing need, researchers have turned to non-invasive brain stimulation as a potential next step in care.

As part of my master’s research at UCSF, I completed a full literature review examining exactly that: Can Transcranial Magnetic Stimulation (TMS) or Transcranial Direct Current Stimulation (tDCS) help reduce auditory hallucinations?
Here’s what I found.

What Are TMS and tDCS?

Non-invasive ways to retune the brain

Both TMS and tDCS work by gently influencing electrical activity in the brain—without surgery, anesthesia, or medication.

Transcranial Magnetic Stimulation (TMS)

Uses a magnetic coil placed on the scalp
Sends short magnetic pulses into targeted brain regions
Patients remain awake and return to normal activity afterward
FDA-approved for depression; off-label for hallucinations

Transcranial Direct Current Stimulation (tDCS)

Uses two electrodes to deliver a very low electrical current
Can “calm” overactive areas or stimulate underactive ones
Portable, discreet, and low-side-effect
Still experimental for psychosis

Both therapies aim to balance brain regions involved in language, perception, and internal speech—the same regions that tend to “light up” during auditory hallucinations.

Why Brain Stimulation for Hallucinations?

Because certain brain areas fire when the voices do

Imaging studies reveal that when someone hears voices, specific regions of the brain become hyperactive, especially the:

Left temporal and temporo-parietal areas
Wernicke’s and right Wernicke’s areas
Fronto-temporal networks

This hyperactivity can make internal thoughts feel external—creating the perception of an actual “voice.”

TMS and tDCS work by nudging these areas back toward balance.

What My Review of the Research Found

I examined five randomized, double-blind, sham-controlled trials—the most rigorous form of clinical research. All participants had schizophrenia spectrum diagnoses and experienced frequent auditory hallucinations.

Here’s a simplified look at what the studies showed.

tDCS: Promising in Some Studies, Less Clear in Others

Study 1 – Twice-daily tDCS showed real benefits

31% reduction in hallucinations
Only 8% improvement in the placebo group
Some patients maintained relief for three months
Suggests tDCS can meaningfully help when delivered more intensively

Study 2 – Once-daily tDCS did NOT outperform placebo

Active group improved 24%
Placebo improved 34%
Strong placebo effect overshadowed active results

Bottom line:
tDCS is safe, accessible, and promising, but results vary based on frequency, location of stimulation, and individual patient factors. More research is needed—but the potential is real.

TMS: Stronger and More Consistent Evidence

Study 3 – Low-frequency TMS to Wernicke’s areas

Significant improvement in hallucination severity
Better global clinical outcomes
Supported by MRI-guided targeting

Study 4 – Internal vs external voices

Both active and placebo TMS helped
External voices responded best
Highlights the importance of understanding hallucination type

Study 5 – High-frequency TMS: Short-term relief

Noticeable improvement at Day 14
Benefits faded by Day 21–30
Suggests frequency matters

Bottom line:
Low-frequency, precisely targeted TMS shows the strongest, most consistent benefit for reducing auditory hallucinations—especially when using neuro-navigation to target language-processing areas.

The Placebo Effect: An Unexpected Clue

Several studies showed meaningful improvements even in the sham groups. This isn’t failure—it’s information.

It suggests:

Structure, support, and therapeutic ritual matter
Expectation can influence perception
Psychosis may involve both neurobiology and cognition
A blended treatment model (brain + mind + environment) may hold the most promise

This aligns beautifully with the integrative mental health approach we use at Ania-ra Psychiatry.

So… Are These Treatments Ready for Everyday Use?

Not quite yet.

TMS is FDA-approved for depression, but still off-label for hallucinations.
tDCS is experimental and primarily available in research settings.

However, the overall research—including my own review—shows:

Real potential for both TMS and tDCS
Stronger evidence for low-frequency TMS
A clear need for more studies on dose, frequency, and individualized targeting

For people who continue to hear voices despite medication, these therapies may represent a hopeful next frontier.

What This Means for Care at Ania-ra Psychiatry

At Ania-ra, we believe in curious medicine—staying open, informed, and rooted in science while honoring the full humanity of each person we serve.

This research aligns with our philosophy:

Exploring innovative treatments with a critical, patient-centered eye
Understanding psychosis through brain, body, and lived experience
Continuing to challenge outdated thinking about what is or isn’t possible in recovery

While we may not offer TMS or tDCS for psychosis directly in practice today, we:

Help patients navigate the evidence
Discuss off-label options honestly
Collaborate with research centers when appropriate
Advocate for personalized, stigma-free care

If you or a loved one is struggling with persistent auditory hallucinations, know that you are not alone—and that gentle, non-invasive treatments like TMS and tDCS may become increasingly available as research evolves.

Final Thoughts

Your brain is not broken.
You are not beyond help.
And the field is moving—rapidly—toward better, safer, and more compassionate options.

If you’re curious about innovative treatments or want support navigating complex symptoms, Ania-ra Psychiatry is here to help you explore your next steps with clarity, dignity, and hope.