Steenbergen, L., Sellaro, R., Hommel, B., Lindenberger, U., Kühn, S., & Colzato, L. S. (2016). "Unfocus" on foc.us: Commercial tDCS headset impairs working memory. Experimental Brain Research, 234(3), 637-643. doi:10.1007/s00221-015-4391-9.