Researchers in Japan from Tohoku University’s Institute of Development, Aging, and Cancer conducted a study on the cognitive effects of neurofeedback that was published in the journal Brain Science last November.  They explored processing speed, memory span, and attention using neurofeedback games among 60 participants and found “considerable improvements in episodic memory, working memory, and attention.”

You can find a full copy of the published study here and a summary of the study at Medical Express.