The effect of subject expectations of "hypnosis" upon vividness of visual imagery.

This study explored how the expectation of hypnosis and the expectation of relaxation affected the vividness of visual imagery. 63 Ss who volunteered for a visual imagination study were randomly assigned to 4 groups. Ss were administered the vividness subscale (VS) of the Vividness and Control of Imagery Scale twice. In the 3 experimental groups, expectations were varied during the 2 VS administrations. All 3 groups were presented with a relaxation exercise between VS administrations. In 2 groups, it was labeled "hypnosis," and in the third group it was correctly labeled "relaxation." A control group listened to a neutral tape between their VSs. All groups were administered the Harvard Group Scale of Hypnotic Susceptibility, Form A (Shor & E. C. Orne, 1962) after the 2 imagery tests. The results indicated that the vividness of visual imagery was significantly enhanced (equally) in the experimental groups but not in the control group.