From: hubermanlab
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Hypnotizability refers to an individual’s capacity to enter a hypnotic state and experience hypnotic phenomena. It is a crucial aspect of understanding how one might benefit from clinical hypnosis and can significantly influence the outcome of hypnotic interventions.
The Concept of Hypnotizability
Hypnotizability is not evenly distributed across the population. Research shows that approximately two-thirds of adults are capable of being hypnotized to some degree. Within this group, about 15% are considered to be highly hypnotizable, exhibiting a strong capacity to enter a deep hypnotic state. Conversely, around one-third of people are not hypnotizable at all. This measure of hypnotizability tends to stabilize by the early 20s, with psychological studies showing a remarkably high consistency in hypnotizability over a span of 25 years, rivalling even IQ stability [01:04:44].
Measuring Hypnotizability
Dr. David Spiegel, a leading expert in hypnosis, has underscored the importance of identifying an individual’s level of hypnotizability to tailor hypnotic interventions appropriately. A widely used method for assessing this trait is the “Spiegel Eye-Roll Test” which involves observing how an individual’s eyes roll back as they look up and close their eyelids. A greater degree of upward eye movement upon closing the eyelids without the downward movement of the iris indicates a higher level of hypnotizability [01:07:39].
Components of the Test
- Procedure: The individual is asked to tilt their head back and fix their eyes on a point, then slowly close their eyelids while maintaining that upward eye position.
- Observation: A key observation is whether the white of the sclera becomes visible as the eyelid closes, indicating that the person is still looking up while their eyes close. This phenomenon is associated with higher hypnotizability [01:08:54].
Hypnotizability Over Time
Studies, such as those conducted at Stanford University, show that hypnotizability is highly consistent over a person’s lifetime, especially once an individual reaches their early 20s. This trait shows a notable test-retest reliability, with correlations around 0.7 over 25 years, indicating that for those seeking hypnotic treatments, these levels are relatively fixed and stable [01:04:50].
Applications of Hypnotizability Assessment
Understanding a person’s hypnotizability can guide clinicians in selecting appropriate therapeutic strategies. For highly hypnotizable individuals, direct hypnotic interventions may be more effective, whereas those with low hypnotizability might benefit from alternative therapeutic approaches such as cognitive behavioral therapy or exposure-based methods.
Benefits of Hypnotizability Assessment
By accurately assessing hypnotizability, clinicians can not only predict the potential efficacy of hypnotic treatments but also enhance patient outcomes by tailoring therapeutic approaches to individual capabilities.
In summary, hypnotizability is a key determinant in the efficacy of hypnosis, influencing both the approach and success of therapeutic interventions. The Spiegel Eye-Roll Test serves as a straightforward and reliable measure to assess this trait, helping to ensure personalized and effective clinical hypnosis treatments.