Editorial Expression of Concern:"Unfocus" on foc.us: commercial tDCS headset impairs working memory

Abstract

The Editors-in-Chief are issuing an editorial Expression of Concern for this article. An investigation by Universiteit Leiden has concluded that in the reporting of this study data from at least two participants were omitted or replaced without this being disclosed. However, the investigation was unable to determine the exact number of participants whose data were omitted or replaced. The first/corresponding author has stated that data from five participants were excluded prior to analysis due to poor task performance without this being disclosed. Readers should therefore interpret the results and conclusions with caution. All authors agree with this statement.