Here’s a link to PDF of Official Journal of The American Academy of Pediatrics article:
Naomi J. Steiner, Elizabeth C. Frenette, Kirsten M. Rene, Robert T. Brennan and Ellen C. Perrin
WHAT’S KNOWN ON THIS SUBJECT: An estimated 9.5% of children are diagnosed with attention-deficit/hyperactivity disorder (ADHD), which affects academic and social outcomes. We previously found significant improvements in ADHD symptoms immediately after neurofeedback training at school.
WHAT THIS STUDY ADDS: This randomized controlled trial included a large sample of elementary school students with ADHD who received in-school computer attention training with neurofeedback or cognitive training. Students who received neurofeedback were reported to have fewer ADHD symptoms 6 months after the intervention.