The goal of this study is to verify the effectiveness of the intensive-individual cognitive participation intervention (SCI-i) on the general cognitive functioning and specific cognitive functions of patients with mild or moderate cognitive decline affected by Alzheimer's dementia, Parkinson's and Multiple Sclerosis.
Participants will be subjected to cognitive training (tasks on attention, memory, language, executive functions, and visual-spatial functions) through software. They will take place using virtual cameras and virtual reality (VR) viewers. All subjects will undergo follow-up evaluation.