An important feature of the later half of the twentieth century was the clear separation of cognitive neuropsychology and cognitive neuroscience. Cognitive neuropsychologists study the human mind after brain damage has occurred, and focus more on cognition. Cognitive neuroscientists study the human brain and neural systems after brain damage has occurred, and focus more attention on the neurons. While the cognitive neuroscientists are concerned with how the brain works, and what parts of the brain is responsible for what functions, cognitive neuropsychologists want to study people with brain damage to try and see how the human mind works. With this information, they can formulate theories about the human mind, and also make better therapies for people with brain damage.