A microprocessor-based psychopathology laboratory: I. Why bother?

The greater than usual need for stimulus control, closed-loop design to control for organic state variables, and the acquisition of complex data on thought disorders makes on-line microprocessors especially important in psychopathology research.     

A microprocessor-based psychopathology laboratory: II. Research goals and design prerequisites

The design of a microprocessor-based psychopathology laboratory is influenced by (1) special procedures in many experimental paradigms and (2) some theoretical considerations about psychopathological data. In terms of design prerequisites, these are summarized as flexibility and power to control a spectrum of experiments, large data-processing capacity, ability to provide clinically relevant data on short notice, mobility, and simplicity of operation and programming.     

Construct Validity of the Balloon Analogue Risk Task (BART): Relationship with MDMA Use by Inner-City Drug Users in Residential Treatment

In a program of research assessing the validity of the balloon analogue risk task (BART; C. W. Lejuez et al., 2002) as a measure of risk taking, the BART was administered to a sample of inner-city drug users in residential treatment (n = 76). Construct validity of the BART was evaluated by measuring risk-taking behavior and 3,4-methylenedioxymethamphetamine (MDMA) use while controlling for self-reported impulsivity, sensation seeking, polysubstance use, and demographic variables. Supporting the construct validity of the BART, while controlling for interrelated variables in the context of logistic regression analyses, (BART) risk-taking propensity accounted for significant incremental variance in differentiating MDMA users from non-users. BART scores, polysubstance use, and younger age were most associated with MDMA use, and together these variables were associated with 91% classification accuracy in predicting MDMA use.     

Assisted versus asserted autonomy satisfaction: Their unique associations with wellbeing,integration of experience,and conflict negotiation

We investigate the possibility of two distinct approaches to autonomy satisfaction—one that is contextually “assisted” and one that is individually “asserted”. Exploratory and confirmatory factor analyses (Pilot Study and Study 1; N = 449) develop and validate the two-factor structure. We then show that asserted and assisted autonomy orientations predict psychological wellbeing through distinct pathways (i.e., highly active/agentic vs. interdependent). In Study 2 (N = 206), we examine the sociodevelopmental antecedents of each type of autonomy satisfaction, revealing that assisted autonomy is associated with having had authoritiative parents, whereas asserted autonomy is associated with having had authoritarian parents. In Study 3 (N = 109) we show that asserted—but not assisted—autonomy predicts the integration of negative life experiences. Finally, in Study 4 (N = 202), we examine the degree to which assisted and asserted autonomy moderate responses to conflict in need-thwarting contexts, showing that assisted autonomy predicts an acquiescent coping style, whereas asserted autonomy predicts an assertive negotiation style.     

Effects of three training types on vitality among older adults: A self-determination theory perspective

ObjectivesTo investigate effects of endurance, functional and strength training on subjective vitality in older adults. Using the self-determination theory (SDT) framework we tested the moderating effects of autonomy support and mediating effects of need satisfaction on participants’ changes in vitality.DesignParallel-groups randomized controlled trial.Methods138 older adults (M = 74.2 years, SD = 4.5) were randomized to a training group or wait-list control, with assessments at baseline, at 7 weeks (short term), and 16 weeks (long term). Mixed models provided estimates of treatment effects, with covariates for moderating effects of autonomy support and mediating effects of need satisfaction (autonomy, competence, relatedness). Inferences were based on uncertainty in standardized effect-sizes (ES) in relation to a smallest important ES of 0.20.ResultsAt short term, effects on vitality were moderate for endurance training (ES = .70, ±.44), and small for functional (ES = .54, ±.36) and strength training (ES = .21, ±.47). At long term only endurance training had a clear effect on vitality (ES = .27, ±.38). Perceived autonomy support moderated the effect of endurance training at short term (ES = .66, ±.66), and functional training at long term (ES = .23, ±.40). Change in competence mediated the effect of functional and strength training at long term, while in endurance training high perceptions of autonomy support moderated the mediation effect of competence on vitality.ConclusionsEndurance training is recommended for increasing subjective vitality in older adults. Moderating effects of autonomy support and mediating effects of need satisfaction are partially consistent with self-determination theory.     

Multiphase mixed-effects models for repeated measures data

Behavior that develops in phases may exhibit distinctively different rates of change in one time period than in others. In this article, a mixed-effects model for a response that displays identifiable regimes is reviewed. An interesting component of the model is the change point. In substantive terms, the change point is the time when development switches from one phase to another. In a mixed-effects model, the change point can be a random coefficient. This possibility allows individuals to make the transition from one phase to another at different ages or after different lengths of time in treatment. Two examples are reviewed in detail, both of which can be estimated with software that is widely available.