Summer-pattern seasonal affective disorder is the lesser-known, agitated opposite of winter depression -- real enough for NIMH's diagnostic criteria, but still short on answers about its cause.

"Popcorn brain" isn't a medical diagnosis, but the dopamine-driven attention pattern it describes is one clinicians take seriously. Here's what the evidence actually supports.

Born in the 1960s and early 1970s, today's middle-aged Americans report more loneliness, depression and memory trouble than the generation before, a 17-country study finds.