APA Dictionary of Psychology

a measure of a person’s ability to become deeply involved in a task or an aspect of the environment. Consisting of 34 statements (e.g., “I like to watch cloud shapes change in the sky”) to which participants respond true or false, it is considered to be a reliable indication of the ease with which an individual can be hypnotized. [devised in 1974 by Dutch-born U.S. psychologist Auke Tellegen (1930–  )]