A meta-analysis examined the relation between self-esteem and ingroup bias. The project focused on effects of ingroup bias strategy and measurement of self-esteem. Results indicated that high-self-esteem individuals exhibited more ingroup bias than did low-self-esteem individuals. Bias strategy and self-esteem measurement moderated this relation. When using “direct” ingroup bias strategies, high-self-esteem individuals showed more bias than did low-self-esteem individuals. When using “indirect” strategies, groups exhibited comparable amounts of bias. Results were comparable for collective and personal self-esteem measures. Examination of specific collective measures indicated that self-esteem defined by the Collective Self-Esteem Scale (Luhtanen & Crocker, 1992) did not predict differences in ingroup bias, whereas group identification measures did predict differences in ingroup bias. Results are interpreted as indicating that both high and low-self-esteem individuals exhibit ingroup bias; however, expression of ingroup bias by individuals with low self-esteem is constrained by situational factors. Furthermore, individual-level factors such as personal self-esteem may be useful in predicting collective enhancement.

No abstract

Proactive interference occurs when previously relevant information interferes with retaining newer material. Overcoming proactive interference has been linked to the hippocampus and deemed critical for cognitive functioning. However, little is known about whether and how this ability can be improved or about the neural correlates of such improvement. Mindfulness training emphasizes focusing on the present moment and minimizing distraction from competing thoughts and memories. It improves working memory and increases hippocampal density. The current study examined whether mindfulness training reduces proactive interference in working memory and whether such improvements are associated with changes in hippocampal volume. 79 participants were randomized to a 4-week web-based mindfulness training program or a similarly structured creative writing active control program. The mindfulness group exhibited lower proactive interference error rates compared to the active control group following training. No group differences were found in hippocampal volume, yet proactive interference improvements following mindfulness training were significantly associated with volume increases in the left hippocampus. These results provide the first evidence to suggest that (1) mindfulness training can protect against proactive interference, and (2) that these benefits are related to hippocampal volumetric increases. Clinical implications regarding the application of mindfulness training in conditions characterized by impairments to working memory and reduced hippocampal volume such as aging, depression, PTSD, and childhood adversity are discussed.

2. I thank Jerry Hamburg for developing the course tutorial, programming some of the interactive exercises, handling technical support issues, and assisting in the design of the course.

In this article, we describe and evaluate a Web-based interactive tutorial used to present hypothesis testing concepts. The tutorial includes multiple-choice questions with feedback, an interactive applet that allows students to draw samples and evaluate null hypotheses, and follow-up questions suitable for grading. Students either used the interactive tutorial (n = 15) or completed a standard laboratory assignment (n = 10) covering the same topics. Students who used the tutorial performed better (p = .06) on a quiz than students who completed the standard laboratory, supporting the effectiveness of this freely available online tutorial. A second group of students (n = 112) who did not participate in the assessment overwhelmingly rated the tutorial as easy to use, clear, and useful.