Scientific foundations
Hypnosis is not
a belief.
It is a natural phenomenon, and scientifically proven.
Two centuries of clinical history, decades of neuroscience research, more than 5 000 research articles published over the past 20 years in the most rigorous scientific journals. Hypnosis has long established its credentials within the scientific community. For anxiety alone, a 2019 meta-analysis identified 399 published articles.
Part I
A rich
and ancient history
18th century
Franz Anton Mesmer and animal magnetism
The Viennese physician Franz Anton Mesmer observed that some of his patients entered altered states of consciousness during his treatments. His theory of “animal magnetism” was refuted by a royal commission — which included Benjamin Franklin — but the effects he produced were real. The commission invalidated the explanation, not the phenomenon.
1843
James Braid — birth of the word “hypnosis”
The Scottish surgeon James Braid was the first to propose a neurological explanation for the phenomenon. He coined the term “hypnosis” — from the Greek hypnos, sleep — and demonstrated that it is a state of focused attention, not a state of sleep. He laid the foundations for a scientific approach to the phenomenon.
Late 19th century
Charcot, Bernheim and the French schools
Jean-Martin Charcot at the Salpêtrière and Hippolyte Bernheim in Nancy publicly debated the mechanisms of hypnosis — one seeing it as a neurological phenomenon, the other as universal suggestibility. Freud attended their work. This founding debate still partly structures contemporary research.
20th century
Milton Erickson — the clinical revolution
The American psychiatrist Milton Erickson radically transformed the practice. He abandoned directive and authoritarian hypnosis in favour of a permissive, indirect approach centred on the patient’s resources. His work still influences virtually all contemporary approaches today — including transformative hypnosis. Since the 1990s, neuroscience research has taken over and provided the biological foundations that clinical practice had already observed.
Part II
Hypnosis is a measurable
and studied phenomenon
The hypnotic state is not a metaphor or a cultural construction. It is a distinct psychophysiological state, perfectly natural, characterized by objectively observable neurobiological phenomena, and documented for several decades in leading scientific journals.
A · Operational definition
A modified state of consciousness characterized by three distinct properties
Heightened attentional focus — consciousness concentrates on a reduced field, allowing privileged access to inner processes.
Reduction of peripheral stimuli — the noise of the outside world fades, allowing deeper processing of internal information.
Increased receptivity to suggestions — not as an abandonment of will, but as a temporary suspension of the usual critical filter.
It is neither sleep nor a loss of control — it is a natural state that everyone experiences daily in other forms.
B · Neuroscience data
Measurable brain signatures in neuroimaging
fMRI and EEG research shows reproducible changes in brain activity during the hypnotic state: reduced activity in the anterior cingulate cortex (involved in environmental monitoring), modulation of the Default Mode Network, and changes in connections between the prefrontal cortex, the insula, and pain-processing regions.
These changes are not the result of suggestion or compliance — they are measurable in individuals with high hypnotic suggestibility and absent in others, even when the latter “pretend” to be hypnotized.
Key reference: David Spiegel, Stanford University — research demonstrating brain signatures specific to the hypnotic state, published notably in Cerebral Cortex and PNAS.
Part III
Clinical efficacy
Indications validated by research
Meta-analyses show that hypnosis is more effective than no treatment, and comparable to certain cognitive-behavioural therapies in specific indications. It is validated in three major clinical domains.
A · Pain
Acute and chronic pain
Procedural pain, cancer pain, fibromyalgia, irritable bowel syndrome (IBS). Hypnosis is one of the domains where the clinical evidence is the strongest and most established.
Recognized by the American Psychological Association and the British Medical Association
B · Anxiety and stress
Anxiety and chronic stress
Pre-operative anxiety, chronic stress, specific phobias. Results are particularly well-documented for preparation for medical procedures, where hypnosis significantly reduces anxiety and analgesic consumption.
C · Psychosomatic disorders
Psychosomatic disorders
Functional digestive disorders, stress-related dermatological manifestations (eczema, psoriasis), symptoms of psychosomatic origin. The mind-body interface is an area where hypnosis proves particularly relevant.
Part IV
Explanatory models
Why does it work?
Hypnosis fits fully within contemporary models of psychology and neuroscience. Two families of mechanisms — cognitive and neurobiological — allow it to be accounted for in a coherent and non-mysterious way.
A · Cognitive mechanisms
How the mind processes information differently
Perceptual reframing modifies the way an experience is interpreted — without changing the experience itself. A pain perceived as threatening can be experienced differently when its meaning changes.
The modification of expectations — expectancy theory — plays a central role: what the subject expects to experience directly influences their experience. Hypnosis creates favourable conditions for a change in expectations.
Selective attention and controlled dissociation allow for the simultaneous processing of information at different levels of consciousness — which explains why changes can occur without the person immediately understanding the mechanism.
B · Neurobiological mechanisms
What happens in the brain and body
Descending pain modulation — by which the brain can inhibit or amplify pain signals — is one of the best-documented mechanisms of hypno-analgesia. It involves the activation of endogenous opioid systems, which neuroimaging studies have confirmed.
Neuronal plasticity — the brain’s capacity to reconfigure itself — is the biological substrate of therapeutic change. Hypnosis creates favourable conditions for this reconfiguration by temporarily modifying patterns of brain activation.
C · Integration with other approaches
Hypnosis is compatible with cognitive-behavioural therapies — some protocols explicitly combine them — and fits naturally within an integrative medicine approach. It is a complementary tool, never a substitute, that amplifies the effectiveness of a holistic support programme.
“
Hypnosis is not an alternative to science. It is, increasingly, a fully-fledged subject of study in its own right — with its mechanisms, its indications, its limits, and its legitimate place in a medicine that considers the human being in their entirety.
Marc Devillard · Eunoria
Curious to go further?
Scientific articles, reference books, videos and documentaries — find a curated selection of resources to go deeper.
Transformative hypnosis is a wellness practice. It does not constitute a medical or psychotherapeutic act, does not establish any diagnosis, and does not replace medical or psychological follow-up. Marc Devillard is a member of the ACNN (Academy of Naturopaths and Naturopathic Practitioners of Canada) and is not a member of a regulated health profession under Bill 21 (Quebec).