Verifying whether someone is in a hypnotic state is partly clinical judgment and partly measurement. No single test proves "hypnosis" definitively for every person; instead you combine behavioral signs, structured tests, subjective report, and (when required) physiological measurements. Below is a practical, step‑by‑step guide you can use in clinical, research, or informal settings.
Before you begin: set context and obtain consent
Explain what you will do and what hypnosis typically feels like (relaxation, focused attention, reduced peripheral awareness, increased suggestibility).
Get explicit informed consent to proceed and to use any recordings or measurements.
Use subjective report
Ask the person to describe their experience during or immediately after induction:
Did they feel deeply relaxed?
Did attention narrow or did external stimuli fade?
Did time feel altered?
Have them rate depth or responsiveness on a simple scale (e.g., 0–10). Subjective report is important but can be influenced by expectations or desire to please.
Observe behavioral signs during induction Look for common, observable indicators:
Reduced spontaneous body movement; slowed breathing.
Facial relaxation and drooping eyelids; glazed or soft gaze if eyes open.
Changes in voice (slower, softer).
Attentional narrowing: decreased response to peripheral noises unless directly addressed.
Automatic, smooth compliance with simple instructions.
These signs are supportive but not conclusive by themselves.
Test responsiveness with standardized hypnotic suggestions Use simple, well‑validated tests of hypnotic response. If the participant reliably follows these suggestions with appropriate experience, it supports that hypnosis (or at least hypnotic suggestibility) is present.
Examples:
Eye-closure or heavy-limb suggestion: “Your eyelids are getting so heavy you can’t keep them open.” If they resist opening or report heaviness, that indicates deepening.
Arm levitation/arm lowering: suggest the dominant arm lifts on its own or becomes too heavy to lift; watch movement and ask for subjective sensations.
Arm catalepsy: suggest the arm stays rigid where placed. Hold it up and release support; persistence suggests strong hypnotic responding.
Anesthesia/analgesia suggestion: suggest decreased sensation in a hand or finger; test with light touch or cold stimulus and compare subjective report and behavioral withdrawal.
Amnesia suggestion: suggest they will forget a specific word or the last few minutes; later ask for recall. Genuine post‑hypnotic amnesia supports strong responding (but ethical precautions are needed).
Ideomotor tests (automatic movements) and ideational tests (changes in perception).
Use established scales for structured assessment:
Harvard Group Scale of Hypnotic Susceptibility (HGSHS) – group use.
Stanford Hypnotic Susceptibility Scales (SHSS:C) – widely used, clinician‑administered.
Waterloo-Stanford Group Scale (WSGC).
These give standardized items and scoring to quantify hypnotizability.
Use objective physiological measures (research/clinical settings) When you need more objective data, combine behavioral tests with physiologic monitoring:
EEG: increased theta power and changes in alpha have been reported during hypnosis, but patterns aren’t uniquely diagnostic.
Heart rate / heart rate variability: often reduced heart rate and increased parasympathetic tone.
Skin conductance: typically reduced arousal, though task‑dependent.
fMRI/PET: show altered activity in attention, default mode, and executive networks in research, but impractical for routine verification.
Physiological measures are supportive and helpful for research, but they don’t provide a one‑to‑one marker of hypnosis.
Differentiate from relaxation, sleep, and compliance
Relaxation/sleep: In hypnosis attention remains focused and responsiveness to suggestions is usually preserved; in sleep responsiveness is reduced. Ask for directed responses to test wakeful attention.
Compliance/placebo effects: Expectancy and desire to comply can mimic hypnotic behaviors. Structured suggestibility tests (items requiring involuntary or automatic responses) and converging physiological signs reduce false positives.
Check for consistency and specificity
Repeat key suggestions or use different modalities (motor, sensory, perceptual) to see whether the responsiveness is consistent.
Use control suggestions (neutral instructions) to check that responses are specific to hypnotic suggestions rather than general compliance.
Ethical and practical considerations
Never coerce. Use transparency and respect for autonomy.
Avoid dangerous suggestions (e.g., self‑harm, anesthesia for medical procedures without qualified oversight).
If you need verification for legal purposes, be aware that courts treat hypnotic evidence with caution and standards vary.
Summary — practical verification checklist
Obtain consent and baseline report.
Observe behavioral signs (relaxation, slowed breathing, focused gaze).
Administer standardized hypnotic suggestions (eye closure, arm levitation/catalepsy, analgesia, amnesia) and note behavioral and subjective responses.
Use a validated scale (SHSS, HGSHS) when possible to quantify suggestibility.
For research or stronger objective support, add physiological monitoring (EEG, HRV, skin conductance).
Rule out simple relaxation, sleep, or mere compliance by testing involuntary or automatic responses and repeating items.