Dear Mrs. Gall, Mrs. Antal, and Mr. Sabel,

Thank you for supplementing our editorial on electrical stimulation of the retina and optic nerve with your own data on electrical stimulation of the brain. We regret that we had to omit several citations in our editorial. In a developing research field with increasing interest of colleagues and patients, naturally also accompanied by justified critical voices, we feel that it is absolutely crucial to assess safety and efficacy using standardized testing equipment and openly discuss findings. We also believe that in order to make results repeatable, stimulating parameters should be readily accessible to the research community and not fall behind commercial interests. Only this can ensure a fruitful scientific discussion and potentially give electrical stimulation treatment an accepted role in the treatment of patients.