There has been much recent excitement amongst neuroscientists and ethicists about the possibility of using drugs, as well as other technologies, to enhance cognition in healthy individuals. This excitement has arisen from recent advances in neuroscientific technologies such as drugs that increase alertness and wakefulness in healthy individuals or technologies that can stimulate activity in different parts of the brain - either via the scalp or via electrodes - raising the possibility of producing cognitive and affective improvements in otherwise healthy individuals. Despite this growing...