This study evaluated the role of asymmetric processing of information in depression. Depression has been hypothesized to involve a deficit in the global processing of information (Tucker, 1982). This type of global processing has been manipulated through the use of hypnosis by Crawford and Allen (1983). In the current study, a 3 x 2 ANCOVA design allowed the comparison of three groups of subjects on their performance on a perceptual task measuring global perception. The task chosen was designed by Navon (1977) and consisted of designs which differed on global or local features. The groups were screened with the Beck Depression Inventory, the Harvard Group Scale of Hypnotic Susceptibility, and the Edinburgh Handedness Inventory, yielding 46 subjects divided into three groups of right-handed males and females. The experimental group consisted of high susceptible depressives from the community. The controls were one group of high susceptible normals and one of low susceptible depressives. All groups performed the Navon task under both waking and hypnosis conditions. Analysis of the results revealed a main effect for group (F(2, 86) = 9.60, p < .01) on the global scores. In addition, high social desirability scores predicted slower presentation times. However, hypnosis was not effective in creating a significant change in performance on the dependent measure. The results are discussed as support for the hypothesized differences between depressives and normals. Differences between the measures used in the present study and that of Crawford and Allen suggest that hypnosis may mediate imagery at a conceptual level but not at the level of the primary visual-perceptual system.

This study compared the relative efficacy of two different theoretically-derived strategies in the hypnotic treatment for cigarette smoking. The use of counterconditioning suggestions (present or absent) was compared to the use of role-playing suggestions (present or absent) in a two-way factorial design. Also investigated was whether there were any pretreatment variables which could predict successful long-term smoking control. Fifty adult chronic smokers were matched on the dimensions of baseline smoking rate, number of years smoking and number of previous attempts to quit smoking, then assigned to one of four treatment groups. All subjects were offered four sixty-minute group hypnotherapy treatment sessions over a three week period, with smoking rate assessed at the second, third and fourth sessions, and at one-month, three-months and six-months post-treatment. The two dependent measures of percentage reduction from baseline smoking rate and percentage of subjects in each treatment group remaining abstinent from smoking showed similar results. ANOVA procedures found a significant Time of assessment X Counterconditioning interaction, indicating that the use of counterconditioning suggestions facilitates the long-term maintanence of smoking control more than the use of role-playing suggestions or a "hypnotic relaxation" treatment using no specific suggestions. The demographic variables of increased age, having a smoking-related health problem, and being a "stimulation" type of smoker were found to correlate highly with successful long- term outcome and to correctly classify subjects as abstainers or nonabstainers the majority of the time.