This book talks about the multidimensional biological etiology of Alzheimer s disease and autism spectrum disorder which leads to distinctive ways of perception, thinking and learning in affected individuals. It provides a deeper emphasis on the need for early diagnosis, continuous assessment of patients and the proper educational methods and environment required towards enabling people affected with these disorders capable of evolving and learning. This book explores alternative solutions for autism spectrum disorder based on the theory of brain plasticity, the relationship between the gut microbiota and the central nervous system along with genetic factors and toxic metal exposures which are responsible for the oxidative damage resulting in a decreased ability of the patients to use objects or response to auditory stimuli.