The Role of Response Styles in the Assessment of Intraindividual Personality Variability.

Although personality psychologists often focus on between-person differences, understanding intraindividual variability is also a critical focus of the subdiscipline. Despite the fact that non-self-report techniques exist for assessing variability, questionnaire-based measures are still the norm. In two studies (N = 149 and N = 202) we examine the possibility that intraindividual variability measures derived from repeated self-report assessments are affected by certain response styles. These studies, which use a variety of techniques for assessing within-person variability, show that standard measures are moderately to strongly correlated with theoretically unrelated variability measures, including those based on ratings of satisfaction with neutral objects or the personality of cartoon characters. These results raise questions about the validity and utility of widely used measures for assessing intraindividual variability.