The orexin/hypocretin system, first identified in 1998, is now recognized as a central regulator of energy balance, sleep–wake states, and arousal ...

Humans and animals share a remarkable capacity to sense when others are in distress and respond with comforting behavior. But the motivation for doing so, and why it sometimes breaks down, has been ...

I was a third-year medical student at Northwestern on my ICU rotation the first time I saw a dopamine drip. The patient was pale and motionless, his blood pressure dropping by the minute despite large ...