Effectiveness of the MMPI-2-RF Validity Scales for Feigned Mental Disorders and Cognitive Impairment: A Known-Groups Study

The MMPI and MMPI-2 validity scales have long been accepted as standard tools in the assessment of feigned mental disorders (FMD) based on their extensive empirical validation. Studies are now examining MMPI-2-RF with modified validity scales plus the new Infrequent Somatic Responses Scale (F_S) and the recently-adapted Response Bias Scale (RBS). The current investigation used a known-groups design to examine the effectiveness of the MMPI-2-RF for differentiating FMD and feigned cognitive impairment (FCI) from patients with genuine disorders for a large civil forensic sample. Criterion measures included the Structured Interview of Reported Symptoms-2 (SIRS-2) for the FMD group, and below-chance performances on the Victoria Symptom Validity Test (VSVT) and the Test of Memory Malingering (TOMM) for the FCI group. For FMD, both F-r and F_P-r produced very large effect sizes (ds > 2.00). Moreover, the absence of severe elevations (≥80 T) on F-r proved effective at ruling-out most FMD. For the current study, a F_P-r cut score ≥90 T for FMD produced virtually no false-positives (0.01) and only a moderate level of false-alarms. As predicted by its detection strategies, most MMPI-2-RF validity scales have limited effectiveness with the FCI group. However, FBS-r and RBS may be useful in conjunction with other clinical data for ruling out FCI for genuine neuropsychological consults. An entirely separate concern is whether certain diagnostic groups, such as major depression, will have marked elevations on MMPI-2-RF scales thereby increasing the likelihood of false-positives. On this point, F_P-r performed exceptionally well with unelevated scores (Ms < 55 T) consistently across diagnostic categories.     

Transformations of mathematical and stimulus functions

Following a pretest, 8 participants who were unfamiliar with algebraic and trigonometric functions received a brief presentation on the rectangular coordinate system. Next, they participated in a computer-interactive matching-to-sample procedure that trained formula-to-formula and formula-to-graph relations. Then, they were exposed to 40 novel formula-to-graph tests and 10 novel graph-to-formula tests. Seven of the 8 participants showed substantial improvement in identifying formula-to-graph relations; however, in the test of novel graph-to-formula relations, participants tended to select equations in their factored form. Next, we manipulated contextual cues in the form of rules regarding mathematical preferences. First, we informed participants that standard forms of equations were preferred over factored forms. In a subsequent test of 10 additional novel graph-to-formula relations, participants shifted their selections to favor equations in their standard form. This preference reversed during 10 more tests when financial reward was made contingent on correct identification of formulas in factored form. Formula preferences and transformation of novel mathematical and stimulus functions are discussed.     

MMPI-2 at the crossroads: aging technology or radical retrofitting?

Paradigmatic shifts are uncommon in psychological assessment, which is often steeped more in tradition than innovative practices. The introduction of the Restructured Clinical (RC) Scales by Tellegen et al. (2003) represents a radical shift in the development and validation of the MMPI-2 (Butcher, Dahlstrom, Graham, Tellegen, & Kaemmer, 1989). In broadening the debate over the merit of the RC Scales, in this article, we examine current challenges to MMPI-2 interpretation including issues with discriminant validity and imprecision (e.g., standard errors of measurement).We evaluate the RC alternative in the context of these interpretive challenges. Although we note several improvements, the incremental validity for MMPI-2 interpretative statements remains to be established. MMPI-2 researchers may wish to test several innovative models for their comparative strengths in establishing scale properties and providing empirically based interpretations.     

The MMPI-2 Restructured Clinical Scales: a paradigmatic shift in scale development

Tellegen et al. (2003) proposed fundamental changes in MMPI-2 (Butcher, Dahlstrom, Graham, Tellegen, & Kaemmer, 1989) scale development by discarding empirical scale development in favor of construct validation via Jackson's (1970) sequential system of scale development. As a result of their efforts, a general distress factor (Demoralization) was identified and 8 Restructured Clinical (RC) Scales were developed. Using 7,330 clinical cases from Caldwell's (1997) data set, in this study, we sought to cross-validate the MMPI-2 RC Scales. Scale homogeneity was confirmed with high alpha coefficients and interitem correlations in the expected range. We also achieved a major objective of reducing interscale correlations. In replicating Tellegen et al.'s principal components analysis, we achieved a high concordance for 6 of the 8 RC Scales. We critically examine these results in light of Jackson's construct validation. We discuss the clinical usefulness of the MMPI-2 RC Scales within the context of current and future research.     

Scope of attention, control of attention, and intelligence in children and adults

Recent experimentation has shown that cognitive aptitude measures are predicted by tests of the scope of an individual's attention or capacity in simple working memory tasks and also by the ability to control attention. However, these experiments do not indicate how separate or related the scope and control of attention are. An experiment with 52 children (10 to 11 years old) and 52 college students included measures of the scope and control of attention, as well as verbal and nonverbal aptitude measures. The children showed little evidence of using sophisticated attentional control, but the scope of attention predicted intelligence in that group. In adults, both the scope and control of attention varied among individuals and accounted for considerable individual variance in intelligence. About one third that variance was shared between scope an d control, and the rest was unique to one or the other.Scope and control of attention appear to be related but distinct contributors to intelligence.     

Deconstructing therapy outcome measurement with Rasch analysis of a measure of general clinical distress: the Symptom Checklist-90-Revised

Rasch analysis was used to illustrate the usefulness of item-level analyses for evaluating a common therapy outcome measure of general clinical distress, the Symptom Checklist-90-Revised (SCL-90-R; Derogatis, 1994). Using complementary therapy research samples, the instrument's 5-point rating scale was found to exceed clients' ability to make reliable discriminations and could be improved by collapsing it into a 3-point version (combining scale points 1 with 2 and 3 with 4). This revision, in addition to removing 3 misfitting items, increased person separation from 4.90 to 5.07 and item separation from 7.76 to 8.52 (resulting in alphas of .96 and .99, respectively). Some SCL-90-R subscales had low internal consistency reliabilities; SCL-90-R items can be used to define one factor of general clinical distress that is generally stable across both samples, with two small residual factors.