There are obvious similarities between the cognitive constructs of Beck's cognitive theory, the hopelessness model, and the response styles theory. No single comprehensive model has yet integrated the core cognitive concepts of these theories, however. In order to develop such an integrative cognitive model, we conducted two independent studies with 588 and 606 participants, respectively, from a university population. Both studies support the idea that all cognitive constructs of the three models are distinct from each other. Furthermore, both studies provide evidence for the possibility an integration of the constructs in one cognitive model. If future studies replicate these findings, the integrated cognitive model can provide a theoretical framework to better understand how therapeutic techniques derived from one model influence cognitive variables from another model. This might even allow for improvements in the effectiveness of psychotherapies by theory-driven combinations of therapeutic techniques that are based on different models.
According to Beck's cognitive model of depression the activation of dysfunctional beliefs triggers negative automatic thoughts, which can be interpreted as the proximal "cause" for emotional, somatic, and motivational symptoms of depression. This top-down processes of beliefs causing thoughts and furthermore of thoughts causing symptoms can be called "cognitive hierarchy." Besides these processes there are bottom-up influences as well with dysfunctional beliefs being activated by external and internal events. A differentiation between top-down processes and bottom-up influences can be drawn with the first being seen as causing thoughts and emotions while the latter only activate existing beliefs. To test Beck's maintenance and the vulnerability hypothesis considering the cognitive hierarchy we suggest an experimental paradigm to experimentally manipulate beliefs, thoughts, and emotions separately and independent from each other. To test both hypotheses in an experimental paradigm depressed and nondepressed subjects are asked to concentrate on new beliefs, thoughts, or emotions during the imagination of personally stressful life events in two studies. Based on the top-down processes it was posited that concentration on new beliefs should lead to changes on all three levels of experience. Adding a new thought should cause changes on the levels of thoughts and emotions while new emotions should only change the level of emotions. The results confirm our hypotheses concerning beliefs and thoughts, but adding emotions changes the levels of thoughts as well as emotions. The results support the central role of beliefs in the development and maintenance of depressive symptoms.
In contrast to previous stress research, studies concerning phobic disorders have never systematically investigated individual response differences between phobic participants integrating numerous different response measures. The aim of this article is to clarify the existence of significant individual response differences in psychophysiological responses (e.g., heart rate, skin conductance responses (SCR), corrugator, cortisol), subjective ratings (e.g., valence, arousal), and avoidance behavior in 46 spider phobic and 44 non-phobic women when exposed to 20 phobic and 20 neutral pictures. Previous studies that did not attend to individual response differences showed that, during phobic stimulation, phobic individuals have increased psychophysiological responses (heart rate, SCR, and corrugator responses), more negative valence rating, and more subjective arousal than non-phobic individuals. These results were confirmed by our data. With regard to individual response uniqueness, 1/3-2/3 of spider-phobic women with low responsiveness in heart rate, cortisol, and avoidance behavior were indistinguishable from non-phobic women during phobic stimulation. With SCR, corrugator EMG, and subjective ratings, no individual response uniqueness was found. Based on the findings, exposure therapy might be improved by tailoring interventions to individuals with a therapeutic focus on those psychophysiological measures that show the highest individual responsivity.
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