The detection of malingered post-traumatic stress disorder

Presenting the consequences of feigning: Does it diminish symptom overendorsement? An analog study

Feigning causes personal and societal consequences, in both civil and criminal context. We investigated whether presenting the consequences of feigning can diminish symptom endorsement in feigned Posttraumatic Stress Disorder (PTSD). We randomly allocated non-native English speaking undergraduates (N = 145) to five conditions: 1) Truth tellers (n = 31), 2) Civil context feigners (n = 27), 3) Civil context warned feigners (n = 26), 4) Criminal context feigners (n = 29), and 5) Criminal context warned feigners (n = 32). All feigning groups received a vignette depicting a situation in which claiming PTSD would be beneficial. One vignette referred to the personal injury claim, whereas the second was about the aggravated assault charges. Additionally, one feigning group from each setting received information about the consequences of feigning (i.e., warned feigners). After receiving the instructions, all participants were administered the Self-Report Symptom Inventory (SRSI), a measure of symptom endorsement. Truth tellers endorsed fewer symptoms than all feigning groups, which mostly did not differ. Yet, criminal warned feigners (59%) were significantly less frequently detected on the SRSI as overreporters than other feigning groups (86.2%-89%). Hence, emphasizing the negative consequences of overreporting may diminish symptom endorsement, but only in high-stake situations. The implications and limitations (e.g., online measure administration) of this work are discussed.

Assessing symptom exaggeration of psychopathology in incarcerated individuals and mentally ill offenders within forensic contexts

In forensic contexts, there is a high probability that offenders may exaggerate illness to avoid legal punishment. Since very few empirical studies presently exist on this matter in Thailand, the objectives are to explore the prevalence rate of the exaggeration of psychopathological symptoms and to examine the detection strategy response styles for Thai version of the Symptom validity test (SVT-Th). An analysis of the factors that influence symptom exaggeration would also be included. Mixed participants included 608 individuals consisting of 528 Incarcerated individuals and 80 Mentally Ill Offenders (MIOs). SVT-Th indicated the prevalence rates of feigned psychopathology among overall offenders were 8.88%, 3.20% for incarcerated individuals, and 46.30% for MIOs. As expected, the endorsed average scores of the psychopathological symptoms using the Amplifier and Unlikely response style were recorded at similar amounts. Offenders with a history of mental illness exaggerated their symptoms to a greater degree than those without a history of mental illness. With regard to the type of crime and the number of offenses, no discrepancies of statistical significance were found. Interestingly, offenders who committed violent crimes, and with more than four times the number of offenses, were more likely to exaggerate their symptoms than the other subjects.

Behavioral, Physiological and EEG Activities Associated with Conditioned Fear as Sensors for Fear and Anxiety

Anxiety disorders impose substantial costs upon public health and productivity in the USA and worldwide. At present, these conditions are quantified by self-report questionnaires that only apply to behaviors that are accessible to consciousness, or by the timing of responses to fear- and anxiety-related words that are indirect since they do not produce fear, e.g., Dot Probe Test and emotional Stroop. We now review the conditioned responses (CRs) to fear produced by a neutral stimulus (conditioned stimulus CS+) when it cues a painful laser unconditioned stimulus (US). These CRs include autonomic (Skin Conductance Response) and ratings of the CS+ unpleasantness, ability to command attention, and the recognition of the association of CS+ with US (expectancy). These CRs are directly related to fear, and some measure behaviors that are minimally accessible to consciousness e.g., economic scales. Fear-related CRs include non-phase-locked phase changes in oscillatory EEG power defined by frequency and time post-stimulus over baseline, and changes in phase-locked visual and laser evoked responses both of which include late potentials reflecting attention or expectancy, like the P300, or contingent negative variation. Increases (ERS) and decreases (ERD) in oscillatory power post-stimulus may be generalizable given their consistency across healthy subjects. ERS and ERD are related to the ratings above as well as to anxious personalities and clinical anxiety and can resolve activity over short time intervals like those for some moods and emotions. These results could be incorporated into an objective instrumented test that measures EEG and CRs of autonomic activity and psychological ratings related to conditioned fear, some of which are subliminal. As in the case of instrumented tests of vigilance, these results could be useful for the direct, objective measurement of multiple aspects of the risk, diagnosis, and monitoring of therapies for anxiety disorders and anxious personalities.

Psychometric Performance of the Miller Forensic Assessment of Symptoms Test (M-FAST) in Veteran PTSD Assessment

This study examined the psychometric properties of a widely used measure of symptom exaggeration, the Miller Forensic Assessment of Symptoms Test (M-FAST, Miller, 2001), in a sample of 209 (83.7% male) trauma-exposed veterans (57.9% probable current posttraumatic stress disorder; PTSD). M-FAST total scores evidenced acceptable internal consistency, but several subscales showed poor internal consistency. Factor analytic and item-response theory analyses identified seven poorly performing items. Comparisons with other measures of psychopathology and response validity (including subscales from the Minnesota Multiphasic Personality Inventory-2 Restructured Form) revealed that M-FAST scores were highly correlated with indices of psychopathology while less strongly associated with measures of symptom over-reporting. Empirically and clinically-derived (using a follow-up testing-the-limits procedure) revised M-FAST scores failed to improve the measure's psychometric performance. Results raise concerns about the validity of the M-FAST for identifying malingering in veterans with PTSD and carry implications for access to care and forensic evaluations in this population.

Indicators to distinguish symptom accentuators from symptom producers in individuals with a diagnosed adjustment disorder: A pilot study on inconsistency subtypes using SIMS and MMPI-2-RF

In the context of legal damage evaluations, evaluees may exaggerate or simulate symptoms in an attempt to obtain greater economic compensation. To date, practitioners and researchers have focused on detecting malingering behavior as an exclusively unitary construct. However, we argue that there are two types of inconsistent behavior that speak to possible malingering-accentuating (i.e., exaggerating symptoms that are actually experienced) and simulating (i.e., fabricating symptoms entirely)-each with its own unique attributes; thus, it is necessary to distinguish between them. The aim of the present study was to identify objective indicators to differentiate symptom accentuators from symptom producers and consistent participants. We analyzed the Structured Inventory of Malingered Symptomatology scales and the Minnesota Multiphasic Personality Inventory-2 Restructured Form validity scales of 132 individuals with a diagnosed adjustment disorder with mixed anxiety and depressed mood who had undergone assessment for psychiatric/psychological damage. The results indicated that the SIMS Total Score, Neurologic Impairment and Low Intelligence scales and the MMPI-2-RF Infrequent Responses (F-r) and Response Bias (RBS) scales successfully discriminated among symptom accentuators, symptom producers, and consistent participants. Machine learning analysis was used to identify the most efficient parameter for classifying these three groups, recognizing the SIMS Total Score as the best indicator.

Neural correlates of response bias: Larger hippocampal volume correlates with symptom aggravation in combat-related posttraumatic stress disorder

The diagnosis of posttraumatic stress disorder (PTSD) is vulnerable to the simulation or exaggeration of symptoms as it depends on the individual's self-report of symptoms. The use of symptom validity tests is recommended to detect malingering in PTSD. However, in neuroimaging research, PTSD diagnosis is often taken at face validity. To date, no neuroimaging study has compared credible PTSD patients with those identified as malingering, and the potential impacts of including malingerers along with credible patients on results is unclear. We classified male patients with combat-related PTSD as either credible (n = 37) or malingerers (n = 9) based on the Morel Emotional Numbing Test and compared structural neuroimaging and psychological questionnaire data. Patients identified as malingerers had larger gray matter volumes in the hippocampus, right inferior frontal gyrus and thalamus, and reported higher PTSD symptoms than credible PTSD patients. This is the first structural neuroimaging study to compare credible PTSD patients and malingerers. We find evidence of structural differences between these groups, in regions implicated in PTSD, inhibition and deception. These results emphasize the need for the inclusion of SVTs in neuroimaging studies of PTSD to ensure future findings are not confounded by an unknown mix of valid PTSD patients and malingerers.

Malingering mental disorders: Clinical assessment

Malingering is the dishonest and intentional production of symptoms. It can cause considerable difficulty as assessment runs counter to normal practice, and it may expose clinicians to testing medicolegal situations. In this first part of a two-article review, we explore types of psychiatric malingering and their occurrence across a range of common and challenging scenarios, discussing presentations that may help delineate true from feigned illness. A framework is provided for undertaking an assessment where malingering is suspected, including recommendations on clinician approach, the use of collateral information, and self-evaluation of biases. The uses, and limitations, of psychometric tests are discussed, including ‘general’, malingering-specific and ‘symptom validity’ scales.

Learning Objectives

• Understand the challenges of determining ‘real’ from ‘malingered’ symptomatology across a range of psychiatric conditions

• Have a rational strategy for approaching a clinical assessment where malingering is suspected

• Appreciate the role and limitations of various psychometric tests that can be used in such assessments

Identifying and Managing Malingering and Factitious Disorder in the Military

Malingering is the intentional fabrication of medical symptoms for the purpose of external gain. Along similar lines as malingering, factitious disorder is the intentional creation or exaggeration of symptoms, but without intent for a concrete benefit. The incidence of malingering and factitious disorder in the military is unclear, but likely under reported for a variety of reasons. One should be aware of potential red flags suggesting malingering or factitious disorder and consider further evaluation to look for these conditions. A deliberate and intentional management plan is ideal in these cases. Furthermore, a multi-disciplinary team approach, a non-judgmental environment, and the use of direct but dignity sparing techniques will likely be most "successful" when confronting the patient with malingering or factitious disorder.

Combat-related PTSD in military court: a diagnosis in search of a defense

As more veterans return from Iraq and Afghanistan, Posttraumatic Stress Disorder (PTSD) often returns with them. As a result, PTSD has quickly become the most prevalent mental disorder diagnosis among active duty United States (U.S.) military. Although numerous studies have not only validated PTSD but have chronicled its negative behavioral impact, it remains a controversial diagnosis. It is widely diagnosed by all types of mental health professionals for even minimal trauma, and DSM-IV PTSD criteria have wide overlap with other mood and anxiety disorders. This, however, has not stopped PTSD from being used in civilian courts in the U.S. as a mental disorder to establish grounds for mental status defenses, such as insanity, diminished capacity, and self-defense, or as a basis for sentencing mitigation. Not surprisingly, PTSD has recently found its way into military courts, where some defense attorneys are eager to draw upon its understandable and linear etiology to craft some type of mental incapacity defense for their clients. As in the civilian sphere, this has met with mixed success due to relevance considerations. A recent court-martial, U.S. v. Lawrence Hutchins III, has effectively combined all the elemental nuances of PTSD in military court.

Variation in practices and attitudes of clinicians assessing PTSD-related disability among veterans

One hundred thirty-eight Veterans Affairs mental health professionals completed a 128-item Posttraumatic Stress Disorder (PTSD) Practice Inventory that asked about their practices and attitudes related to disability assessment of PTSD. Results indicate strikingly wide variation in the attitudes and practices of clinicians conducting disability assessments for PTSD. In a high percentage of cases, these attitudes and practices conflict with best-practice guidelines. Specifically, 59% of clinicians reported rarely or never using testing, and only 17% indicated routinely using standardized clinical interviews. Less than 1% of respondents reported using functional assessment scales.