Depression is a real illness that affects mood, feelings, behavior and physical health, and contrary to what many people believe, it's not a normal part of aging or a personal weakness, but it is very treatable.
As science makes a reality of what has been science fiction, we will face questions of how to best apply neurotechnologies. Should they be limited to helping those who have illnesses? Or should they bolster the performance of a wartime soldier, enable a C student to get As, or supercharge CEOs?