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Neurofeedback improves mental flexibility and produces a mental state appropriate to situational requirements. Neurofeedback can be an interesting choice of treatment for attention-deficit hyperactivity disorder (ADHD) in conjunction with other treatments or when other treatments fail. It has been shown that both animals and humans can learn to control their brainwaves by operant conditioning. Furthermore, it has been documented that different electro-cortical activities reflect different states of arousal and that a number of disorders, including ADHD, can be discriminated by characteristic patterns on the quantitative electroencephalogram (QEEG). The studies conducted so far have shown that neurofeedback addresses the core symptoms of ADHD. The majority of the research has been done with children and adolescents, and although research shows encouraging results there is a need for further controlled and larger group studies of children and particularly of adults with ADHD.