In both cases there has been a convergence of Compound C cost work implicating mPFC dysregulation. Clearly, both types of conditions involve a failure to regulate affect in effective ways, and the mPFC is a driver of such regulation. An extensive neuronal network has been implicated

in depressive and anxiety disorders, and a consideration of this work goes well beyond this review. However, it has been suggested that for both PTSD (Hartley and Phelps, 2010, Koenigs and Grafman, 2009, Shin and Liberzon, 2010 and Stevens et al., 2013) and depression (DeRubeis et al., 2008 and Rive et al., 2013) that limbic hyperactivity is a key alteration, with mPFC hypoactivity being a cause as top–down inhibition is thereby diminished. The fact that this sort of model has been proposed for two

different DSM categories is not problematic since Tyrosine Kinase Inhibitor Library manufacturer there is considerable co-morbidity between categories. Indeed, it may be that reduced mPFC inhibition of stress-responsive limbic and brainstem structures is the type of dysregulated biopsychological dimension that is envisioned by the RDoc effort (Cuthbert and Insel, 2013). The work reviewed in this paper may provide some insight with regard to therapies. The two major treatments for depression, for example, are anti-depressant medications (ADM) such as selective serotonin reuptake inhibitors (SSRIs) and cognitive therapy (CT). A number of reviews and meta-analyses have indicated that both are effective in reducing depressive symptoms, but that relapse after discontinuation is much higher following ADM than CT (Hollon et al., 2005). That is, CT has a more enduring protective impact. In CT patients are taught to identify the thoughts and images that lead to aversive emotional reactions, and to examine and re-evaluate the validity of these beliefs. Thus, the Libraries patient is taught how to reduce the negative of emotions that they often experience. From the present perspective, this training has a strong element of perceived control—the patient is taught that they can reduce the negativity of their emotions and experiences by using the techniques of thought re-evaluation that

they are being trained to perform. It has been argued (DeRubeis et al., 2008) that this process would engage the mPFC, leading to top–down inhibition of limbic structures. Our work would suggest that this might induce long-lasting plasticity in the mPFC, thereby producing enduring positive effects. Although speculative, perhaps ADM acts directly on limbic structures, or even at the PFC, but does not lead to plasticity, resulting in effects that are not enduring. For over 40 years (Seligman and Maier, 1967 and Weiss, 1968) it has been known that the presence of a stressor-controlling response, in the form of an escape response, blunts the impact of the stressor being experienced. However, the mechanism(s) by which this occurs has remained a matter of debate.