observation

I mean, it's making-- We have observations about the expansion of the universe, but it's also giving us the mechanism of that, right?

Instead, we always have prior expectations of what we might experience next, and then new observations update our beliefs accordingly.

So the portrait is an idealized version of her, based more on imagination than observation.

What's been noticed is, in a clinical study that had nothing to do with depression, it was just an observation, they gave a low dose of ketamine.