What Hypnosis Does to the Brain: A Scientific Perspective

MRI Brain scan

Adapted and referenced from the Stanford University School of Medicine

Hypnosis isn’t about losing control or falling under someone’s spell. According to research from Stanford University School of Medicine, it’s a measurable shift in how the brain organizes attention, perception, and self‑awareness. When a person enters a hypnotic state, several key brain networks change their activity and the way they communicate with each other — and these changes explain why hypnosis can reduce pain, ease anxiety, and support healing.

How the Stanford Study Worked

Researchers scanned the brains of 57 adults using functional MRI.

To study hypnosis itself — not pain, not vision, not memory .They screened 545 volunteers. Each participant was scanned under four conditions:

Resting

Recalling a memory

Hypnosis session #1

Hypnosis session #2

This allowed scientists to isolate what the brain does only during hypnosis.

Three Distinct Brain Changes During Hypnosis

Stanford researchers found three reliable neural signatures during hypnosis.

1. Reduced Activity in the Dorsal Anterior Cingulate (dACC)

The dACC is part of the brain’s “salience network,” which keeps you alert to distractions and constantly evaluates what matters.

During hypnosis, activity in this region drops.

Meaning:

The person becomes deeply absorbed, less self‑critical, and less preoccupied with outside concerns — a mental state that makes therapeutic suggestions more effective.

2. Increased Connectivity Between the DLPFC and the Insula

The dorsolateral prefrontal cortex (DLPFC) works with the insula to regulate internal bodily states and interpret sensations.

Under hypnosis, communication between these two areas strengthens.

Meaning:

The brain becomes better at modulating pain, emotional responses, and bodily sensations — a key reason hypnosis can change how the body feels and reacts.

3. Reduced Connectivity Between the DLPFC and the Default Mode Network (DMN)

The DMN includes regions involved in self‑reflection and monitoring your own actions.

During hypnosis, the link between executive control (DLPFC) and self‑awareness (DMN) weakens.

Meaning:

There is a temporary disconnect between doing and thinking about doing.

This allows people to follow suggestions more fluidly, without overthinking or self‑judgment — similar to being fully immersed in a task.

Why These Brain Changes Matter

Hypnosis can:

• Reduce chronic pain

  
  

• Ease childbirth pain

  
  

• Improve comfort during medical procedures

  
  

• Support trauma recovery

  
  

• Treat phobias and anxiety

  
  

• Help with smoking cessation and habit change

Hypnosis as Serious Science

David Spiegel, MD — a leading hypnosis researcher at Stanford — emphasizes that hypnosis is one of the oldest Western psychotherapies. Despite its reputation for stage tricks, it is a powerful clinical tool for changing perception, regulating the body, and supporting healing.

The study reinforces that hypnosis is not entertainment; it is a measurable brain state with therapeutic potential.

Future Possibilities

Combining hypnosis with brain stimulation could:

• Strengthen its pain‑relieving effects

  
  

• Reduce reliance on addictive pain medications

  
  

• Offer new treatments for anxiety and trauma

More research is needed, but the findings open the door to expanding hypnosis as a mainstream medical tool.