What is hypnosis?
Hypnosis is a set of procedures designed to support focused attention, reduced attention to distractions, and responses to suggestions. A typical session may include guided relaxation, imagery, focused attention, and suggestions related to a person’s goals.
Hypnosis is not the same as sleep, unconsciousness, or loss of control. People generally remain aware of the situation and can respond to questions. Their experience varies: some feel deeply absorbed, while others notice mainly a shift in attention or a greater willingness to imagine suggested experiences.¹
Hypnosis is also not a single treatment. It is a method that may be combined with approaches such as cognitive behavioral therapy, pain-management training, or exposure-based work. Its usefulness depends on the problem being addressed, the person’s expectations, the practitioner’s skill, and the broader treatment plan.
Does hypnosis make people do things against their will?
No good evidence supports the idea that hypnosis reliably overrides a person’s values or forces behavior that the person strongly resists. Suggestions can influence experience and behavior, but people retain the ability to respond, decline, or stop participating.
That does not mean hypnosis is powerless. Focused attention and expectation can affect experiences such as pain, distress, imagery, and confidence. It also means that suggestions should be used carefully, especially when the subject involves trauma, memory, health, or legal matters.
Is everyone equally responsive to hypnosis?
No. Hypnotic responsiveness varies among individuals and is influenced by attention, expectation, motivation, imagination, and the social context. It is not a simple measure of intelligence, honesty, weakness, or mental health.²
People may also respond differently from one situation to another. Someone might experience vivid imagery but show little change in pain, or respond well to suggestions in a calm setting but not during acute stress.
What is memory reconsolidation?
Memory reconsolidation is a process in which a previously stored memory becomes temporarily modifiable after it is reactivated. Afterward, the memory may be stored again, or “reconsolidated,” with changes in its emotional tone, meaning, details, or links to other information.
The basic idea is not that every act of remembering automatically rewrites a memory. Rather, under some conditions, reactivation can open a period during which the memory is more responsive to new learning. Research has identified reconsolidation processes across several forms of learning, but the conditions, timing, and effects vary by task and by memory system.³
How is reconsolidation different from ordinary forgetting?
Forgetting usually refers to reduced access to information or a decline in performance over time. Reconsolidation refers to what can happen after a memory is retrieved and becomes temporarily changeable.
A memory can also become stronger after retrieval. For example, successful recall may reinforce access to the memory. Whether a retrieved memory is updated, strengthened, weakened, or left largely unchanged depends on factors such as the strength of the original memory, the way it is reactivated, what new information follows, and the person’s emotional state.
What is a traumatic engram?
An engram is a term used for the physical changes in the nervous system that support a learned memory. In contemporary neuroscience, researchers often use “engram” to describe a population of cells and associated changes that participate in storing or expressing a particular memory.⁴
A traumatic engram, used cautiously, refers to the neural representation of learning associated with a threatening or overwhelming event. It is not a literal object, photograph, or single isolated memory trace located in one precise spot in the brain. Memories are supported by distributed changes involving multiple brain systems.
A traumatic experience can include several kinds of learning at once:
Sensory learning: sights, sounds, smells, bodily sensations, or physical positions.
Threat learning: associations between cues and danger.
Contextual learning: information about where and when something happened.
Emotional learning: fear, shame, helplessness, grief, or anger.
Procedural learning: automatic defensive responses, such as freezing or avoiding.
These components do not always return together. A person may remember facts without feeling intense fear, experience a bodily reaction without a clear narrative, or react to a present-day cue that resembles part of an earlier situation.
Does “traumatic engram” mean that trauma is permanently fixed?
No. The term does not imply that a traumatic memory is unchangeable or that a person’s response is permanently determined. Memory is biological, dynamic, and influenced by later learning.
At the same time, “changeable” does not mean “easily erased.” Traumatic memories can remain emotionally powerful, especially when reminders continue to signal danger or when avoidance prevents corrective learning. Recovery generally involves learning that certain present situations are different from the original threat, while developing safer ways to respond to reminders.
How might hypnosis relate to memory reconsolidation?
Hypnosis may help some people focus attention, use imagery, notice internal experiences, and engage with therapeutic suggestions. Those features could support new learning when a distressing memory or expectation is activated in a structured and safe setting.
However, hypnosis should not be presented as a guaranteed method for opening or rewriting traumatic memories. Research on memory reconsolidation is more specific than the popular claim that “remembering makes memories editable.” A proposed reconsolidation-based intervention must show that the relevant memory was reactivated, that a period of modification occurred, and that later changes were not better explained by relaxation, expectation, ordinary extinction learning, repeated exposure, or other factors.
Clinical research has examined hypnosis in areas such as pain, anxiety, and trauma-related symptoms, but evidence quality differs by condition and study design. Hypnosis may be a useful adjunct for some people, but it should not replace well-supported care or be used to promise memory erasure.⁵
Can hypnosis recover hidden or forgotten traumatic memories accurately?
Hypnosis cannot guarantee accurate recovery of forgotten events. Memory is reconstructive, and confidence does not always indicate accuracy. Questions, expectations, imagery, repeated retelling, and suggestions can influence what a person later remembers and how certain the person feels.⁶
This is particularly important when a person is trying to determine whether a highly consequential event occurred. A vivid image, strong emotion, bodily sensation, or hypnotic experience is not, by itself, proof that a specific event happened.
For this reason, responsible practice avoids leading questions and treats newly emerging memories as experiences to evaluate carefully—not as automatically verified historical records. When legal, medical, or safety decisions are involved, independent evidence and appropriate professional guidance matter.
Can hypnosis create false memories?
Hypnosis can increase the vividness, confidence, or subjective reality of an imagined event, and it may increase vulnerability to suggestion in some circumstances. This does not mean every hypnotized person develops false memories, but it does mean that memory-focused hypnosis requires special caution.⁷
A safer approach avoids:
Asking leading questions that imply a particular event occurred.
Treating imagination as proof.
Repeatedly rehearsing an uncertain account.
Suggesting that symptoms necessarily reveal a hidden cause.
Encouraging a person to search for a specific traumatic memory.
Presenting a therapist’s interpretation as established fact.
When the goal is symptom relief, therapy can focus on current reactions, safety, coping, relationships, and meaning without trying to recover a supposedly buried event.
What is the difference between reconsolidation and exposure therapy?
Both approaches can involve contact with distressing memories, thoughts, sensations, or cues, but they are not identical.
Exposure-based methods generally involve planned, repeated, and supported contact with feared memories or situations so that the person can learn new information and reduce avoidance. The precise mechanisms of exposure therapy are debated, and improvement may involve inhibitory learning, changes in beliefs, emotional processing, and other forms of new learning.⁸
A reconsolidation-based account proposes a more specific sequence: reactivate a target memory, create a mismatch between the old expectation and new experience, and allow the memory to be updated. Not every effective therapy needs to be described as reconsolidation-based, and not every memory change demonstrates reconsolidation.
In practice, the treatment label matters less than careful assessment, informed consent, a clear rationale, and evidence that the method is helping.
What might a careful session look like?
A responsible session may include:
Clarifying the goal. The focus might be reducing panic, improving sleep, managing pain, responding differently to reminders, or strengthening a sense of safety.
Explaining the method. The practitioner describes what hypnosis is, what it is not, and how the person can pause or stop.
Establishing present-day stability. The person develops grounding and coping skills before approaching highly distressing material.
Using nonleading language. The practitioner avoids implying that a particular memory, event, or interpretation must be true.
Working within tolerance. The person is not pushed into overwhelming distress.
Building new learning. The session may support present-focused safety, flexible attention, self-compassion, and accurate distinctions between past and present.
Reviewing the outcome. The practitioner checks whether symptoms, beliefs, and functioning changed and adjusts the plan accordingly.
A session does not need dramatic imagery or a vivid reliving experience to be useful. In many cases, steady attention to present safety and practical coping is more appropriate than searching for a deeper or more complete recollection.
What questions should someone ask a practitioner?
Before beginning, a person may ask:
What training and license do you hold?
What problem are we treating?
What evidence supports this method for that problem?
Will you ask me to recover memories?
How will you avoid leading questions?
What will we do if I become distressed?
How will we measure progress?
What alternatives are available?
What are the limits of hypnosis in this situation?
A qualified practitioner should welcome these questions, explain uncertainty clearly, and avoid claims that hypnosis can reveal hidden truth, erase trauma on command, or guarantee a particular outcome.
What is the main takeaway?
Hypnosis is a focused-attention method that may influence experience and learning, but it does not remove a person’s agency. Memory reconsolidation describes a research-supported process through which some reactivated memories can become temporarily open to change. A traumatic engram is best understood as a distributed pattern of learning and brain changes associated with threat, not as a perfect recording stored in one location.
These ideas may help explain why present experiences can change the emotional impact of past learning. They do not justify treating hypnosis as a lie detector, a guaranteed memory-recovery tool, or a universal treatment for trauma. The safest approach is present-focused, nonleading, collaborative, evidence-informed, and attentive to the person’s control and well-being.
Notes
Michael R. Nash and Grant W. O. Barnier, eds., The Oxford Handbook of Hypnosis: Theory, Research, and Practice (Oxford: Oxford University Press, 2008).
David Spiegel, Jonathan R. Greenleaf, and Diane Spiegel, “Hypnosis and the Hypnotizable Person,” in The Oxford Handbook of Hypnosis: Theory, Research, and Practice, edited by Michael R. Nash and Grant W. O. Barnier (Oxford: Oxford University Press, 2008).
Karim Nader, Glenn E. Schafe, and Joseph E. Le Doux, “Fear Memories Require Protein Synthesis in the Amygdala for Reconsolidation after Retrieval,” Nature 406, no. 6797 (2000): 722–26; Daniel A. C. McKenzie and Oliver J. R. E. Bouton, “A New Look at Reconsolidation: The Role of the Prediction Error in Memory Updating,” Nature Reviews Neuroscience 15, no. 11 (2014): 716–29.
Susumu Tonegawa, Xu Liu, Sayaka Kitamura, and Alcino J. Silva, “Memory Engram Cells Have Come of Age,” Neuron 87, no. 5 (2015): 918–31.
Mark P. Jensen and David R. Patterson, “Hypnotic Approaches for Chronic Pain Management: Clinical Implications of Recent Research Findings,” American Psychologist 61, no. 3 (2006): 167–77.
Elizabeth F. Loftus, “Planting Misinformation in the Human Mind: A 30-Year Investigation of the Malleability of Memory,” Learning & Memory 12, no. 4 (2005): 361–66.
Irving Kirsch, “The Social Psychology of the Placebo Effect,” in The Placebo Effect: An Interdisciplinary Exploration, edited by Anne Harrington (Cambridge, MA: Harvard University Press, 1997).
Michelle G. Craske, Tanja J. K. Treanor, Sarah M. Conway, Anna Zbozinek, and Hans J. Vervliet, “Maximizing Exposure Therapy: An Inhibitory Learning Approach,” Behaviour Research and Therapy 58 (2014): 10–23.