Hypnosis is usually described as a focused, absorbed state of attention with increased responsiveness to suggestion. It is not the same as sleep, unconsciousness, or loss of control. What changes as someone “goes into trance” is less a single switch and more a gradual shift in attention, expectation, body state, and how the brain processes information.[^1][^2]
What typically happens as hypnosis is entered
1) Attention narrows
At the start, attention often becomes more concentrated on one voice, one idea, one image, or one bodily sensation. Competing distractions tend to fade into the background. This is why the induction often uses instructions like:
“Focus on the breath”
“Notice the sound of my voice”
“Let other thoughts drift away”
This narrowing of attention is part of everyday experience too, such as becoming absorbed in a book or movie.[^1][^3]
2) External awareness may reduce
As absorption increases, the person may become less responsive to irrelevant outside stimuli. They may still hear sounds, but those sounds often feel less important unless the hypnotist points them out.
This is why a quiet environment helps, though it is not strictly necessary. Many people still respond to suggestions even with some background noise.[^2]
3) Internal imagery and body awareness often increase
Many people notice stronger mental imagery, vivid memory fragments, or more awareness of bodily sensations such as heaviness, lightness, warmth, or floating. These sensations are not magic; they are often the result of attention plus suggestion shaping perception.[^1][^4]
4) Expectation begins to matter more
A major part of hypnosis is the person’s expectation that something will happen. If they expect relaxation, numbness, or vivid imagery, those effects become more likely. If they expect nothing, the experience may still occur, but it may be weaker or feel less convincing.[^2][^5]
5) Automatic responses become easier
When a suggestion is well matched to the person, responses can feel more automatic and less effortful. For example:
a hand may feel as if it is floating upward
the eyes may feel heavy
the body may feel pleasantly still
a memory may seem to “come up by itself”
This automatic quality is one reason people describe hypnosis as different from ordinary thinking.[^1][^5]
What “deepening trance” usually means
“Deeper trance” does not mean a person is asleep or more powerless. It usually means one or more of the following:
stronger absorption
less awareness of distractions
more vivid imagery
greater response to suggestion
more sense that responses happen automatically
more stable focus over time
In practice, deepening is a functional description, not a fixed biological stage everyone passes through in the same way.[^2][^6]
Common subjective changes during deepening
1) Physical relaxation
Many inductions lead to muscle relaxation, slower breathing, and reduced physical tension. But relaxation is not required for hypnosis. Some people enter a very responsive hypnotic state while feeling alert rather than sleepy.[^1][^2]
2) Time distortion
A common effect is altered time perception. A few minutes may feel long, or a long session may feel short. This happens because attention is no longer tracking time in the usual way.[^4]
3) Reduced self-monitoring
People may become less concerned with how they are “doing” and more involved in the experience itself. For example, instead of checking whether a hand is moving “for real,” they may simply notice that it is moving.[^5]
4) More vivid sensory experience
Suggestions may produce stronger color, sound, temperature, or body sensations in imagination. Some people experience imagery almost like perception, though they still know it is imagined.[^4][^6]
5) Increased responsiveness to suggestion
This is central. A suggestion such as “your arm feels light” or “the chair supports you more and more” may become increasingly accepted, especially when it fits the person’s expectations and attention style.[^1][^5]
6) Dissociation or compartmentalization
Some hypnotic experiences involve a split between different parts of awareness. For example, a person may talk while feeling detached from pain, or may experience one part of the mind as observing while another part responds. This is often called dissociation, though researchers debate the exact mechanism.[^2][^7]
What may happen in the brain and nervous system
Research suggests hypnosis is associated with changes in brain networks involved in:
attention
self-monitoring
executive control
sensory processing
default-mode or self-referential processing
Functional MRI and EEG studies do not show one universal “hypnosis spot” in the brain. Instead, hypnosis appears to alter how networks interact, especially when suggestions are accepted and experienced as real.[^3][^6][^8]
Some studies report changes in connectivity between areas involved in:
top-down control
salience detection
imagery
sensorimotor processing
This may help explain why hypnotic suggestions can affect pain, movement, and perception.[^3][^8]
Why deepening techniques work
Classic deepening methods often use:
counting downward
imagining stairs, elevators, or sinking
repetitive relaxation
fractionation, where trance is entered and exited briefly
reinforcing suggestions like “each breath takes you deeper”
These work because they:
keep attention focused
increase expectation
reduce distraction
build the person’s confidence that something is happening
create a stronger pattern of responding to the hypnotist’s voice[^1][^2]
The “deeper” effect often comes from repeated absorption and repeated success with suggestions, not from a separate hidden state.
Important reality check: trance depth is not a simple ladder
People often imagine hypnosis as a staircase from light to medium to deep trance. In real life, that model is only partly useful.
A person may be:
very physically relaxed but only mildly responsive
highly responsive to one type of suggestion but not another
deeply absorbed yet fully aware of the room
able to experience analgesia without feeling “deep” at all
So trance is better understood as a set of changing responses rather than a single depth score.[^2][^6]
Common signs that hypnosis is taking hold
These signs may appear, though not everyone shows them:
slower blinking
softened facial muscles
steadier breathing
reduced movement
delayed response before answering
fixed gaze or closed eyes
spontaneous swallowing
subtle hand or body movement in response to suggestion
changed tone of voice
reports of heaviness, lightness, or drifting
None of these alone proves hypnosis. They just suggest the person is entering a more absorbed and suggestible state.[^1][^2]
What does not necessarily happen
Hypnosis does not automatically cause:
unconsciousness
truth-telling
complete memory accuracy
loss of personal values
mind control
doing anything against one’s morals
People in hypnosis usually retain some level of awareness and can often reject suggestions that conflict with their goals or values.[^2][^5]
A simple summary of the process
As hypnosis is entered:
attention narrows
outside distractions fade
imagery and internal experience become more important
expectation and suggestion start shaping perception
responses may feel more automatic
repeated absorption deepens the experience
the person may feel more focused, detached from distractions, or more open to therapeutic change[^1][^2][^6]
References
[^1]: Lynn, S. J., Kirsch, I., Terhune, D. B., & Green, J. P. (2023). Handbook of Clinical Hypnosis (various chapters and updated discussions of hypnotic responding and treatment).
[^2]: Elkins, G. R., Barabasz, A. F., Council, J. R., & Spiegel, D. (2015). Advancing research and practice: The revised APA Division 30 definition of hypnosis. International Journal of Clinical and Experimental Hypnosis, 63(1), 1–9.
[^3]: Landry, M., Lifshitz, M., & Raz, A. (2017). Brain correlates of hypnosis: A systematic review and meta-analytic exploration. Neuroscience & Biobehavioral Reviews, 81, 75–98.
[^4]: Oakley, D. A., & Halligan, P. W. (2013). Hypnotic suggestion: opportunities for cognitive neuroscience. Nature Reviews Neuroscience, 14(8), 565–576.
[^5]: Kirsch, I. (2011). The social-cognitive and theory of hypnosis. In The Oxford Handbook of Hypnosis and Hypnotherapy.
[^6]: Terhune, D. B., Cleeremans, A., Raz, A., & Lynn, S. J. (2017). Hypnosis and top-down regulation of consciousness. Neuroscience & Biobehavioral Reviews, 81, 59–62.
[^7]: Spiegel, D. (2013). Tranceformations: Hypnosis in brain and body. Depression and Anxiety, 30(4), 342–352.
[^8]: Jiang, H., White, M. P., Greicius, M. D., Waelde, L. C., & Spiegel, D. (2017). Brain activity and functional connectivity associated with hypnosis. Cerebral Cortex, 27(8), 4083–4093.