Although underexplored, the idea of using brain computer interfaces (BCI) for behavioral and cognitive rehabilitation is based on recent evidence suggesting that not only self-regulated brain signals, but also involuntary brain signals may provide useful information about the BCI user. The aim is to promote the recruitment of neural networks involved in specific brain functions and to facilitate Central Nervous System (CNS) plasticity. Critically, CNS plasticity has been observed in early-stages of dementia, thus constituting a great challenge for the development of "cognitive BCIs" focused on the rehabilitation of brain functions in neurological patients. The main goal of this project is to promote CNS plasticity, and therefore cognitive reserve, through neurofeedback training in subjects with Subjective Memory Complaints (SMC) related to attentional deficits. It is a Phase 0 clinical trial