Both spontaneous and instructed imagery-based therapies have in common two types of image disparity, image failure, and image substitution. The alleged objectifying properties of emergent uncovering psychotherapy suggested that Freud's conception of repression and derivative formation applies to image disparity in each type of therapy. Subjects were asked to visualize the scenes of three stimulus narratives (two aggressive and one affectively neutral but implausible) and to signal successful visualization or type of disparity. Both types of image disparity varied directly with blatancy of scenes depicting anger and aggression. Image failure was more closely associated with implausibility, but image substitution was more closely associated with anger-aggression. The former appears to index interpersonal variables, whereas the latter was consistent with repression and derivative formation. Almost all the subjects signaled image disparity, and many of the image substitutes could be classified into five of Freud's mechanisms of defense.