How Hypnosis Alters the Brain: New Insights from Neuroimaging

About How Hypnosis Alters the Brain: New Insights from Neuroimaging

Hypnosis has long been associated with mysterious trances, swinging watches, and stage performances. But modern neuroscience is revealing that hypnosis is far more than entertainment—it is a measurable, physiologically real state that alters brain function in precise ways. Recent research from Stanford University School of Medicine sheds light on which areas of the brain shift during hypnotic states, deepening our understanding of how hypnosis can influence perception, behavior, and therapeutic outcomes.

Investigating the Hypnotic Brain
To explore how hypnosis affects the brain, researchers studied 57 volunteers using functional magnetic resonance imaging (fMRI), a technique that detects brain activity through changes in blood flow. The participants included individuals who scored at the extreme high and low ends of hypnotizability—a trait describing how easily a person can enter a hypnotic state. About 10% of people are highly hypnotizable, while a similar proportion show minimal responsiveness; the rest fall in between. By comparing these two groups, researchers could identify which brain changes were specifically associated with hypnosis rather than general mental activity.
Each participant underwent brain scans under four conditions: at rest, while recalling a memory, and during two different hypnotic sessions. This approach allowed the scientists to distinguish ordinary brain activity from the patterns unique to hypnosis.
Key Brain Changes Under Hypnosis
The study identified three major neural hallmarks of the hypnotic state, all observed only in highly hypnotizable individuals during hypnosis:
Reduced activity in the dorsal anterior cingulate – Part of the brain’s salience network, this region typically monitors for distractions and errors. During hypnosis, its activity decreases, allowing the person to become deeply absorbed in the experience without concern for external or competing thoughts. Increased connectivity between the dorsolateral prefrontal cortex and the insula – This enhanced link between cognitive control regions and the brain’s body-awareness center appears to strengthen the mind-body connection. It may help individuals regulate sensations, emotions, or responses to therapeutic suggestions. Decreased connectivity between the dorsolateral prefrontal cortex and the default mode network – The default mode network is associated with self-reflection, daydreaming, and awareness of one’s own actions. Reduced communication between these regions during hypnosis allows people to act on suggestions with minimal conscious monitoring, producing the characteristic feeling of involuntary or automatic behavior that many experience under hypnosis. Implications for Therapy
Understanding these neural changes is more than academic; it has practical implications for clinical practice. Hypnosis is increasingly used to treat conditions ranging from chronic pain and anxiety to post-traumatic stress, smoking cessation, and procedural discomfort. Patients who are highly responsive to hypnotic suggestions often experience substantial improvements without the need for medication.
By pinpointing which brain regions are active during hypnosis, researchers hope to expand its benefits to individuals who are less naturally hypnotizable. Techniques that combine brain stimulation with hypnosis could enhance responsiveness, potentially offering non-drug alternatives for managing pain, anxiety, or other conditions. Such approaches could reduce reliance on opioids and anti-anxiety medications, which carry risks of addiction and side effects.
A Broader Understanding
These findings also highlight the legitimacy of hypnosis as a neuroscience-informed practice rather than a theatrical curiosity. “Hypnosis provides a powerful way to change perception, control physiological responses, and influence behavior,” notes David Spiegel, MD, the study’s senior author. The research demonstrates that the hypnotic state is characterized by specific, reproducible patterns of brain activity and connectivity, offering a window into how focused attention and suggestion can shape conscious experience.
While further research is needed to translate these insights into new clinical applications, the study underscores the potential of hypnosis as a tool for both scientific exploration and therapeutic intervention. By revealing the brain’s flexibility under hypnosis, neuroscience is helping demystify this centuries-old practice and establish it as a credible, evidence-based approach to mental and physical well-being.

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