Neuroimaging the Impact of Treatment on Neural Substrates of Trust in Post-Traumatic Stress Disorder (PTSD)

Neuroimaging the Impact of Treatment on Neural Substrates of Trust in Post-Traumatic Stress Disorder (PTSD)

Traumatic experiences can have a profound negative effect on the lives and well-being of both the people who experience them and their loved ones. For those who experience post-traumatic stress disorder (PTSD), their interpersonal difficulties and social support further impact the success of treatment such that interpersonal difficulties are associated with mistrust and predict poor treatment outcome. In this proposal, the investigators use functional neuroimaging to understand the neurobiology of trust and mistrust in people with PTSD and to learn more about how successful treatment can improve trust and social functioning.

Substantial recent data highlight the role of social functioning as a primary moderator of therapeutic response in individuals with post-traumatic stress disorder (PTSD) such that interpersonal difficulties and mistrust significantly and negatively impact treatment efficacy (Forbes et al., 2003; Forbes et al., 2005; Forbes et al., 2008). In addition, ample evidence suggests that psychotherapy improves the social and interpersonal lives of psychotherapy clients through improving clients' abilities to regulate their emotions and reduce social isolation (Yalom & Leszcz, 2005; Foy et al., 2000). While considerable research has been dedicated to exploring the neurobiology of emotional dysregulation associated with PTSD (Rauch, Shin, & Phelps, 2006; Etkin & Wager, 2007), and increasing data suggest that diverse psychotherapies affect neural functioning (Beauregard 2007), very little is understood about the neurobehavioral pathology underlying the debilitating interpersonal difficulties in PTSD, or the neurobiological mechanisms accompanying the improvements in social functioning that occur with efficacious therapy. Thus, the broad goals of this project are two-fold. First, the investigators seek to examine the neural substrates associated with interpersonal dysfunction in PTSD using a social exchange game previously developed to assess interpersonal trust and cooperation in healthy (King-Casas et al., 2005) and psychiatric groups (Chiu et al., 2008; King-Casas et al., 2008). Second, the investigators seek to examine changes in neurobehavioral substrates of social functioning following treatment for Veterans with PTSD. Specifically, the investigators propose to use functional magnetic resonance imaging (fMRI) and behavior within a well-characterized Trust Game to examine the neural substrates associated with interpersonal trust and cooperation in Veterans with PTSD prior to and following empirically supported psychotherapy cognitive processing therapy (CPT) for PTSD. Thus, the broad goals of this project are two-fold. First, the investigators seek to examine the neural substrates associated with interpersonal dysfunction in PTSD using a social exchange game previously developed to assess interpersonal trust and cooperation in healthy (King-Casas et al., 2005) and psychiatric groups (Chiu et al., 2008; King-Casas et al., 2008). Second, the investigators seek to examine changes in neurobehavioral substrates of social functioning following treatment for veterans with PTSD. Specifically, the investigators propose to use functional magnetic resonance imaging (fMRI) and behavior within a well-characterized Trust Game to examine the neural substrates associated with interpersonal trust and cooperation in veterans with PTSD prior to and following empirically supported psychotherapy cognitive processing therapy (CPT) for PTSD.

Participants randomly assigned to the Waitlist Control Group (who will participate in CPT-C after 12 weeks).

Participants will be randomly assigned to participate in CPT-C or a 12 week waitlist control group. Waitlist control subjects will participate in CPT-C after the 12 weeks.

Continuous Whole Brain Imaging With Standard Imaging Parameters for Each Functional Magnetic Resonance Imaging (fMRI) Scan

The CAPS is considered the gold standard measure of PTSD symptoms. CAPS scores are the sum of 17 questions. Each is question is scored from 0 (best possible outcome) to 8 (worst possible outcome). The lowest possible CAPS score is a 0, indicating no PTSD symptoms reported. The highest possible CAPS score is a 136, indicating the most PTSD symptoms reported.

The Investment Ratio (IR) is the amount subjects were willing to invest in a social partner. It is considered a measure of interpersonal trust, and co-operation. It is a ratio ranging from 0 (indicating no willingness to trust a social partner) to 1.0 (willing to totally trust a social partner). It consists of the percentage of total points the subject was willing to invest in a social partner divided by the total points they received for all ten rounds of the trust game. Higher ratio's indicate more trust.

An instrument measuring a participants self-reported level of PTSD symptoms. PCL scores are the sum of 17 questions. Each is question is scored from 1 (best possible outcome) to 5 (worst possible outcome). The lowest possible PCL score is a 17, indicating no troublesome PTSD symptoms reported. The highest possible PCL score is a 85, indicating the worst degree of PTSD symptoms reported.

Inclusion Criteria: Meet criteria for PTSD on the Clinician Administered PTSD Scale (CAPS) Priority will be given to Veterans aged 18-50 who have had an onset of symptoms in the past 10 years and are Veterans of Operation Enduring Freedom/Operation Iraqi Freedom (OEF/OIF) Have been referred for placement in CPT treatment by a clinician in the Trauma Recovery Program at the Michael E DeBakey VA Medical Center (MEDVAMC) or an eligible Veteran who contacts study staff. Are able to see the computer display clearly with or without magnetic Resonance imaging (MRI)-compatible corrective lenses Are free from current non-psychiatric medical problems impacting cognitive functioning. Are cleared to participate by a treating MEDVAMC clinician Are able to participate in functional MRI (fMRI) Exclusion Criteria: Meet Diagnostic and Statistical Manual-IV (DSM-IV)criteria for drug or alcohol abuse in the past 30 days History of moderate to severe traumatic brain injury based on any of the following: (i) Glasgow Coma Score < 13 (ii)alteration of consciousness > 24 hours; loss of consciousness,30 minutes Presence of contraindications to MRI, including but not limited to: claustrophobia pacemaker metal in eyes other implants Current neurological or general medical conditions known to impact cognitive and/or emotional functioning, including but limited to: epilepsy Parkinson's disease Huntington's disease Alzheimer's disease stroke chemotherapy for cancer Acute psychological instability as assessed by a Michael E DeBakey VA Medical Center (MEDVAMC) clinician or study staff Concurrent diagnosis of: schizophrenia schizoaffective disorder delusional disorder organic psychosis and subjects taking antipsychotic medication