Transcranial direct current stimulation (tDCS) is safe and partially effective in treating attention deficit/hyperactivity disorder (ADHD), autism spectrum disorder (ASD), and dyslexia. A team, led by Mohammad Ali Salehinejad, Department of Psychology and Neurosciences, Leibniz Research Centre for Working Environment and Human Factors, provided an update on published randomized-controlled trials applying transcranial direct current stimulation in patients with ADHD, autism spectrum disorder, and dyslexia.