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Neurofeedback therapies based on brain-computer interfaces (BCI) can be used for the rehabilitation of attention deficit hyperactivity disorder (ADHD), as an alternative to conventional treatments. In this paper the design, implementation and preliminary evaluation of Attenti-ON, a hybrid BCI for ADHD rehabilitation, is presented. Attenti-ON uses a Serious Game commanded by the level of attention estimated by the theta/beta ratio of the electroencephalogram as a neurofeedback and also incorporates a manual activity that focuses attention on the required cognitive task., Attenti-ON consists of an user interface and four modules: the first one acquires the electroencephalography signals from prefrontal electrodes, located at Fp1 and Fp2, and conditions them. The second module procceses the signals and generates a valid command for the third module which consists in the Serious Game, developed in Unity. In this …