Individual differences in willingness to become an organ donor: A decision tree approach to reasoned action

The promotion of organ donation requires a better understanding of the attributes associated with willingness to donate. This entails revealing complex interactions among personality attributes related to intentions and behaviors. In the present study, survey data from young adults (N = 367) were analyzed using decision tree algorithms to identify these interactions within the reasoned action framework. Within this structure, donation attitudes, intentions, and behaviors were examined in relation to individual differences such as conscientiousness, empathy, time orientation, religiosity, and interpersonal trust.     

The biasing effect of personality on self-estimates of cognitive abilities in males and females

In addition to exploring the relationship between psychometric and self-estimated measures of Crystallized Knowledge (Gc) and Visual Processing (Gv), this study investigated whether personality significantly moderated these relationships, thereby influencing the accuracy of the self-estimates. Adult participants (N = 165) completed the Big Five Inventory and self-estimated their levels of Gc and Gv. They were subsequently administered the Multidimensional Aptitude Battery II, a group test of cognitive ability. Significant and positive relationships between psychometric Gc and Gv and their respective self-estimates were found. Additionally, investigation of the moderating effects of personality for each gender separately using standard multiple regressions found that females high in Extraversion and males low in Conscientiousness were more prone to overestimating their Gv ability, while males high in Openness provided more accurate estimates of their Gv than those low in Openness. Elucidating the personality traits that distort self-perceptions of intellectual functioning has significant implications for the identification of individuals at risk of harboring inaccurate expectations, leading to the potential for interventions aimed at ameliorating associated deleterious consequences.     

Rushton: The great theoretician and his contribution to personality

J. Philippe Rushton has been described as one of the greatest theorists in the field of personality and individual differences and social psychology. His life history theory (Differential K Theory) was said to bring unification to the scientific study of racial differences as Einstein’s theory of relativity unified the field of physics. It was maintained that Rushton’s General Factor of Personality (GFP) meshes with both general intelligence and his Differential K Theory. The present author presented a two-pillar theory of adaptive functioning that has a heavy concentration on Rushton conceptualization.     

Factorial validity of the Mental Toughness Questionnaire-48

The purpose of this study was to assess the factorial validity of the Mental Toughness Questionnaire-48 (Clough, Earle, & Sewell, 2002). In total, 8207 participants (male n = 4019, female n = 3922, unspecified = 266) aged between 16 and 68 years (M = 37.00, SD = 12.09) completed the MTQ48. Model fit was assessed using confirmatory factor analysis (CFA) and exploratory structural equation modeling, in addition to the robust maximum likelihood estimator. Overall, our results support the factorial validity of the MTQ48 and indicate that the MTQ48 is a robust psychometric measure of mental toughness. Along with previous data, which supports the internal validity of the MTQ48 in addition to results of this study, it would appear that the MTQ48 is an acceptable method of assessing mental toughness.     

Great expectations: A meta-analytic examination of optimism and hope

Optimism and hope—two psychological constructs reflecting positive expectations about one’s future—have garnered considerable research attention and each has been the subject of several narrative reviews. In the current meta-analysis, we examined the optimism–hope relationship and we examined several potential correlates and consequences of optimism and hope. Our results suggest that optimism and hope are distinguishable from each other. Furthermore, both are related to several indices of psychological and physical well-being and both are empirically distinguishable from other personality traits, such as the Five Factor Model characteristics and trait affectivity. We conclude by discussing directions for future research on optimism and hope.     

Item grouping and item randomization in personality measurement

This paper describes a study examining the impact of item order in personality measurement on reliability, measurement equivalence and scale-level correlations. A large sample of university students completed one of three forms of the International Personality Item Pool version of the Big Five personality inventory: items sorted at random, items sorted by factor, and items cycled through factors. Results showed that the underlying measurement model and the internal consistency of the IPIP-Big Five scale was unaffected by differences in item order. Also, most of the scale-level correlations among factors were not significantly different across forms. Implications for the administration of tests and interpretation of test scores are discussed, and future research directions are offered.     

Are the sources of interest the same for everyone? Using multilevel mixture models to explore individual differences in appraisal structures

How does personality influence the relationship between appraisals and emotions? Recent research suggests individual differences in appraisal structures: people may differ in an emotion's appraisal pattern. We explored individual differences in interest's appraisal structure, assessed as the within-person covariance of appraisals with interest. People viewed images of abstract visual art and provided ratings of interest and of interest's appraisals (novelty–complexity and coping potential) for each picture. A multilevel mixture model found two between-person classes that reflected distinct within-person appraisal styles. For people in the larger class (68%), the novelty–complexity appraisal had a stronger effect on interest; for people in the smaller class (32%), the coping potential appraisal had a stronger effect. People in the larger class were significantly higher in appetitive traits related to novelty seeking (e.g., sensation seeking, openness to experience, and trait curiosity), suggesting that the appraisal classes have substantive meaning. We conclude by discussing the value of within-person mixture models for the study of personality and appraisal.     

The Mini-IPIP6: Tiny yet highly stable markers of Big Six personality

We assessed the stability of a short-form six-factor personality measure over a one-year period in a large national probability sample (N = 4289). Personality was assessed using the Mini-IPIP6—a short-form measure assessing Extraversion, Agreeableness, Conscientiousness, Neuroticism, Openness to Experience, and Honesty-Humility. Standardized estimates calculated using Bayesian Structural Equation Modelling (BSEM) indicated that all six personality dimensions were extremely stable. An alternative model using Maximum Likelihood estimation, in which residual item variances were associated over repeated assessments, yielded similar findings. These results highlight the stability of personality in the general population, even when assessed using short-form scales. The use of Bayesian models to examine the stability of personality and their application for study of change in specific developmental periods is discussed.