Background and Purpose: Attention deficit/hyperactivity disorder is a disorder with a complex etiology, documentary studies emphasized on the neurological bases of this disorder. This study was conducted to determine the efficacy of neurofeedback on symptoms of children with attention deficit/hyperactivity disorder.

Method: The single case study design selected 3 children with ADHD between the ages of 8 to 9 years and was trained with neurofeedback in 40 sessions.  Child Symptom Inventory (CSI-4) was used to gather of data.  

Results: For the analysis of data, was used visual analysis of charts, percentage of non-overlapping and overlapping data, Cohen’s d effect size, significance of reliable change index (RCI) and percentage of improvement. The results of the analysis showed that all three subjects had significantly decreased scores in symptoms of attention deficit / hyperactivity disorder during treatment and follow-up. The percent improvement in first participant 72/0, the second participant 66/0, and 75/0 in third subjects.

Conclusion: Neurofeedback with continuous feedback process in order to produce different brain waves encourages the brain to modify, adjust and maintain appropriate action. In fact, neurofeedback training strengthening the mechanisms underlying self-regulation to effectively function.