Hypnotic susceptibility

Hypnotic susceptibility measures how easily a person can be hypnotized. Several types of scales are used; however, the most common are the Harvard Group Scale of Hypnotic Susceptibility and the Stanford Hypnotic Susceptibility Scales.

The Harvard Group Scale (HGSS), as the name implies, is administered predominantly to large groups of people while the Stanford Hypnotic Susceptibility Scale (SHSS) is administered to individuals. No scale can be seen as completely reliable due to the nature of hypnosis. It has been argued that no person can be hypnotized if they do not want to be; therefore, a person who scores very low may not want to be hypnotized, making the actual test score averages lower than they otherwise would be.