The so-called "hard problem" of consciousness, i.e. the problem of explaining how and why we have conscious experiences, has received different formulations across time. Back in 1868, Thomas Henry Huxley suggested that the mystery of consciousness resides somewhere -- or somehow -- in the activity of the brain. Since then, both clinical and basic neurosciences have taken the problem of consciousness seriously, joining the allied disciplines of philosophy and psychology in the seemingly insurmountable quest for consciousness. This book presents some of the latest research in the multidisciplinary field of consciousness studies, dealing with both theoretical and experimental aspects encompassing a wide range of normal and pathological states of consciousness.