The differentiation of personality by intelligence hypothesis suggests that there will be greater individual differences in personality traits for those individuals who are more intelligent. Conversely, less intelligent individuals will be more similar to each other in their personality traits. The hypothesis was tested with a large sample of…

Background: Substantial evidence suggests that a Five-Factor Model personality assessment generates a valid description of childhood individual differences and relates to a range of psychological outcomes. Less is known, however, about naturally occurring profiles of personality and their links to psychopathology. The current study explores…

Temperament is important for considering differences among diagnostic groups and for understanding individual differences that predict problematic behavior. Temperament characteristics, such as negative affectivity, effortful control, and surgency (highly active and impulsive), are predictive of externalizing behavior in typically developing…

The purpose of this study is to examine the differences between groups of psychology students and groups of psychology professionals based on the personality trait of Extraversion, and its facets, as measured by the NEO Personality Inventory-Revised (NEO PI-R; Costa & McCrae, 1992). Previous applications of the NEO PI-R have focused on…

In 1921, Carl Jung wrote about four different types of personality, identified 24 centuries ago by Hippocrates. He theorized that these differences were not abnormalities in personality. Instead, he maintained that human behavior is predictable and classifiable that everyone has and acts upon personal preferences, established in early childhood.…

Eysenck's theory that variations in resistance-to-temptation (i.e., RTT) behavior are contingent on 2 basic personality dimensions -- introversion-extroversion and neuroticism -- which produce differences in conditionability was evaluated in a punishment paradigm with adolescent boys. Measures of manifest anxiety, self-control, and…

Personality differences betweeen adolescent males who engage in illegal behaviors with accomplices and those who engage in illegal behaviors alone are examined. Contrary to the findings of earlier researchers, in the present study, no personality differences between the two groups were found. (Author)

Paper presented at the Conference on Research in Medical Education, 79th Annual Meeting of the Association of American Medical Colleges, Houston, Texas, November 1, 1968.

Two studies were done to investigate the effects of personality, as dichotomized along a thought-action dimension, on time perception. Results of both were similar. The high-extraversive subjects underestimated and the high-introversive subjects overestimated time. (Author)

This study assesses effects of volunteering on results of investigations of drug abuse. (Editor)

This research project ascertained personality profiles of rehabilitation clients. Three personality inventories were used. Results indicated state agency rehabilitation clients are characterized by differential patterns of personality characteristics. The taxonomic procedure used was profile analysis, and data was based on self-report. (NG)

The purpose of the present study was to investigate the underlying dimensions of the 10 Rorschach inkblots by means of standard multidimensional scaling procedures. The question of whether such emergent dimensions would be related to standard Rorschach scoring categories was raised; and the possibility of individual characteristics was explored.…

This study was submitted in partial fulfillment of the requirements for the Ph.D. degree at the University of Iowa.