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Working memory is a core cognitive system that is thought to support many forms of complex cognition. Mindfulness meditation has shown promise in improving the functioning of the working memory system, but no study has thoroughly tested its benefits by using a well-controlled study design (i.e., using multiple, valid outcome measures and an active, adaptive control group). The main goal of the current study was to more rigorously examine the effects of mindfulness meditation on working memory capacity. This was done by comparing 2 weeks of focused attention mindfulness meditation training to active, adaptive cognitive training regarding improvement on multiple, valid indicators of working memory capacity that were different from the tasks participants trained on. The results of the present experiment suggest that 2 weeks of focused attention mindfulness meditation training does not improve working memory capacity when controlling for non-specific effects. Future interventions using similar well-controlled study designs can consider using longer duration, more frequent, or alternative styles of mindfulness meditation training to potentially enhance working memory capacity.

Over the past decade, self-administered mindfulness interventions, such as those administered via phone apps, have become increasingly popular. However, their effectiveness for regulating stress is unclear. In a multi-site study (Nsites = 37, Nparticipants = 2,239; all fluent English speakers) we experimentally investigated the efficacy of four single, stand-alone mindfulness exercises (versus three active control conditions) on self-reported stress with Bayesian mixed-effects models. All mindfulness exercises proved to be more efficacious than the active control conditions in reducing participants' self-reported stress levels. Between the control condition (M = 1.95) and the condition with the largest reduction in stress levels (Body Scan; M = 1.68), there was a mean difference of 0.27 on a four-point scale, (Cohen’s d = -.56) indicating a small decrease in stress. Our findings suggest that brief mindfulness exercises may be beneficial in reducing stress, even though we cannot fully distinguish between true effects and demand effects.