Grad Student Talk | Chris Martin | No Support for Declining Effect Sizes Over Time: Evidence from Three Meta-Meta-Analyses.
In psychology (e.g., Schooler, 2011) and other fields (e.g., Jennions & Møller, 2001), there are reported cases of effect sizes declining over time. Later studies of a given phenomenon report smaller effect sizes than earlier studies. This decline suggests a publication bias toward large effects and regression to the mean. In the current study, we examine whether evidence exists for such a decline effect. In Study 1, we analyzed 3,488 effect sizes across 70 meta-analytic tables, which were drawn from 33 Psychological Bulletin articles (1980–2010). A multilevel analysis revealed no evidence of a linear or quadratic decline effect over time (indexed by publication year). In Studies 2 and 3, we examined 50 meta-analyses each from social psychology and clinical psychology. In both studies, the modal meta-analysis showed no correlation between effect size and publication year. The decline effect in psychology appears to be less prevalent than earlier anecdotal reports suggest. For replications, this finding suggests that expectations that replications will have lower effect sizes than the original may be inaccurate and unfounded. (September 8, 2015)
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What is the nature of the human mind? The Emory Center for Mind, Brain, and Culture (CMBC) brings together scholars and researchers from diverse fields and perspectives to seek new answers to this fundamental question. Neuroscientists, cognitive psychologists, biological and cultural anthropologists, sociologists, geneticists, behavioral scientists, computer scientists, linguists, philosophers, artists, writers, and historians all pursue an understanding of the human mind, but institutional isolation, the lack of a shared vocabulary, and other communication barriers present obstacles to realizing the potential for interdisciplinary synthesis, synergy, and innovation.
It is our mission to support and foster discussion, scholarship, training, and collaboration across diverse disciplines to promote research at the intersection of mind, brain, and culture. What brain mechanisms underlie cognition, emotion, and intelligence and how did these abilities evolve? How do our core mental abilities shape the expression of culture and how is the mind and brain in turn shaped by social and cultural innovations? Such questions demand an interdisciplinary approach. Great progress has been made in understanding the neurophysiological basis of mental states; positioning this understanding in the broader context of human experience, culture, diversity, and evolution is an exciting challenge for the future. By bringing together scholars and researchers from diverse fields and across the college, university, area institutions, and beyond, the Center for Mind, Brain, and Culture (CMBC) seeks to build on and expand our current understanding to explore how a deeper appreciation of diversity, difference, context, and change can inform understanding of mind, brain, and behavior.
In order to promote intellectual exchange and discussion across disciplines, the CMBC hosts diverse programming, including lectures by scholars conducting cutting-edge cross-disciplinary research, symposia and conferences on targeted innovative themes, lunch discussions to foster collaboration across fields, and public conversations to extend our reach to the greater Atlanta community. Through our CMBC Graduate Certificate Program, we are training the next generation of interdisciplinary scholars to continue this mission.