We know dopamine guides reinforcement learning in externally rewarded behaviors—think a mouse learning to press a lever for food or juice. But what about skills like speech or athletics, where there’s no explicit external reward, just an internal goal to match? 🧵 (1/7).

RT @WryCritic: Pterosaurs are so weird, and without anything extant comparable in proportions, it's hard to judge the size of a creature fr….

RT @idcmomina: there’s no urdu word for shining in the setting sun like a pearl upon the ocean come and heal me.

RT @SerpenIllus: A look at three species of Pterosaurs from Late Triassic Europe

RT @mattxiv: i spoke to @yonationalist, who is being imprisoned in two weeks for refusing to join the IDF (and kept in solitary confinement….

RT @chrisstIawrence: did i mention there are whales in nyc?

RT @stormcabbirds: Common Tern with teeny tiny fish. Crossness, Erith

RT @elaine_stritch: part of me wants to watch The Gilded Age so I can learn what exactly a Clock Twink is, but the other part of me is kind….

RT @portiaspetrat: ever since i was a little girl ive loved information.

RT @superkeara: Being in a bad mood is soo humiliating like why am I replying in one word answers this is ruining my brand as a delight to….

RT @RickDaSquirrel_: This was the most insane thing to me in 2005 as a kid watching this movie made by Disney.

RT @TM9380: The largest living dinosaurs, from 3 different categories(largest overall, biggest wingspan, and heaviest flying) https://t.co/….

RT @jeremysmiles: you don't understand. as someone who isn't inherently good at art, stealing paintings from the museum is the *only* way i….

RT @__orialc: do you guys ever draw to relax but then your drawing skills arent working and it turns out so bad that it makes you angrier t….

RT @itsrobotface: Good day on the West Coast.

RT @ivancalcantara: Oh so that’s why they rhyme.

RT @pwiscila: I love watching television shows that have horrible writing, terrible acting, and are just not very good at all.

RT @chrisstIawrence: today i am thinking about killer whales and how much i want to see one in new york.

RT @notdevussy: the concept of missing your train even though you're on time because the train arrived before it's scheduled time.

RT @ntrphl: i know i’m on the right path when i catch a glimpse of the ocean

RT @yurixtinction: sinosauropteryx