In an Annals of Neurology editorial, the clinicians and scientists note that stimulation affects more of the brain than a user may think, which could lead to altered brain functions that are unintended. Also, stimulating one brain area may improve the ability to perform one task but hurt the ability to perform another. Furthermore, small changes in tDCS settings can have large and unexpected effects that may be long-lasting, and tDCS effects are highly variable across different people.
"Scientific papers can give the impression that tDCS has clear benefits with no side effects, motivating do-it-yourself use. However the authors of these scientific papers generally do not encourage this. With do-it yourself tDCS on the rise, we thought it was time to outline why" said Dr. Michael D.. Fox, senior author of the Annals of Neurology article.
Full bibliographic information
Wurzman, R., Hamilton, R. H., Pascual-Leone, A. and Fox, M. D. (2016), An open letter concerning do-it-yourself users of transcranial direct current stimulation. Ann Neurol., 80: 1-4. doi: 10.1002/ana.24689