Does the theory of planned behavior mediate the effects of an oncologist's recommendation to exercise in newly diagnosed breast cancer survivors? Results from a randomized controlled trial.

This randomized trial examined the effects of 2 oncologist-based exercise interventions--recommendation only (RO) and recommendation plus referral (RR)--versus usual care (UC) on social-cognitive constructs from the theory of planned behavior (TPB). The authors also examined whether the TPB mediated the significant effect of the RO intervention on exercise and explained the null effect of the RR intervention. Independent t tests revealed that both interventions had significant effects on TPB constructs; however, only the RO intervention impacted perceived behavioral control (PBC). Path analyses indicated that PBC was the only construct with a direct effect on exercise and that it mediated the effect of the RO intervention on exercise and explained the null effect of the RR intervention.     

Lang's theory of emotional imagery

Abstract

An appraisal is presented of Lang's theoretical and experimental work on emotional imagery. Lang has adopted a “propositionalist” theory of imagery which emphasises the role of the activation of cognitive structures associated with imagery. Questions are raised about the exact properties of these structures and the relation between their activation and the experiential image. Lang's experimental work has provided a generally convincing demonstration of the prediction that response training enhances the subjective vividness of imagery and the level of emotional responsiveness associated with it, although questions remain about the explanation of this effect. hg's predictions regarding the modification of emotional responsiveness associated with imagery have so far received little support from habituation studies, and the available data is considered in the context of the dual-process habituation theory of desensitisation.