Cognitive science is the interdisciplinary, scientific study of the mind and its processes with input from linguistics, psychology, neuroscience, philosophy, computer science/artificial intelligence, and anthropology.
Philosophy is the systematized study of general and fundamental questions, such as those about existence, reason, knowledge, values, mind, and language.
N-Back games are purported to be a training method to improve working memory and working memory capacity and also increase fluid intelligence, although evidence for such effects are lacking.