The best analogies in poetry and science really crackle, but when do they expand our thinking and when do they constrain it?

The mammalian brain is comprised of anatomically and functionally distinct regions. Substantial work over the past century has pursued the generation of ever-more accurate maps of regional boundaries,...

Norepinephrine oscillations during NREM sleep drive synchronized changes in cerebral blood volume and cerebrospinal fluid, promoting glymphatic clearance. Optogenetic and pharmacological manipulations confirm that vasomotion, regulated by norepinephrine, acts as a pump for brain fluid transport.