Arnav Raha

Neuroscience PhD candidate @ZuckermanBrain @Columbia | @BerkeleyBioE alum | Studying RL mechanisms for vocal learning in songbirds (+ fan of animals🐋🦇🦋🦕)

[Arnav Raha @pantamallion]

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)

[Vikram Gadagkar @VikramGadagkar]

Excited to share our latest work on songbirds showing dopamine guides learning of natural behavior https://t.co/ufuX4F2rRV Congrats to @JonathanKasdin Alison Duffy Nathan Nadler @pantamallion @alfairhall @neuro_kim ! @ZuckermanBrain @Columbia @GoogleDeepMind @UW

[mist 𓅨𓅻 @hirundinifaye]

oops!!!! accidentally painted a bunch of whooping cranes again

[はるさめ @haru_same_3]

お絵描き𓅫⸒⸒

[Rick Paulas @rick_paulas]

They should make a map so precise that it becomes the same exact size as the geography that it’s representing and then in fact later on comes to replace the geography itself.

[Drew Schreiner @SchreinerDrew]

A result I love that didnt make the thread: song basal ganglia isnt a simple "frequency" or "duration" knob

Suppressing sBG could ⬆️⬇️ or have no effect on an acoustic parameter depending on whether that parameter was relevant for learning. That’s exciting beyond birdsong (1/2)

[bug girl! @medusasgemss]

there’s something so emotional about finding an empty shell at the beach. like it’s proof that something small and alive once called it home

[Drew Schreiner @SchreinerDrew]

Where, exactly, does learning happen in the brain?

Out now @Nature , we identify a synaptic locus of birdsong learning and show that the circuit can be tuned to make birds learn faster, but at a cost.🧵 #neuroscience
https://t.co/mS6EJUPVa2
Open link: https://t.co/wiJ16guRj1

[Project CETI @ProjectCETI]

Did you know that the first known whale, Pakicetus, walked on land? Learn more and trace the echoes through time, charting humanity’s understanding of whales, starting 50 million years ago with Pakicetus at https://t.co/4XwhtVeh4i

Photo: @AMNH /Carl Buell

[David Clark @d_g_clark]

Now in PRE: "Transient dynamics of associative memory models."
I argue that the "blackout catastrophe" (the famous α≈0.14 transition) is not catastrophic when viewed from an out-of-equilibrium, dynamical perspective.
Journal: https://t.co/F4QCHCWYMF
PDF: https://t.co/X0eQyKAhTo

[Arnav Raha @pantamallion]

though all communication is translation~

[bhooter saline fih @fihbellathyra]

i wish i knew every language so i could read every book in its original voice untouched by translation

[mist 𓅨𓅻 @hirundinifaye]

bird requests (6/10 done)

[Aberrantologist @aberrantologist]

Parvinatator swims near the coastline. It is very little.

[.🔅𝖆𝖘𝖙𝖗𝖆𝖕𝖎𝖔𝖓𝖙𝖊🔅. @astrapionte]

Meet Dagonodum mojnum, a medium-sized beaked whale that's known from Miocene Denmark 🇩🇰!

#cetacea #paleoart

[SaurianCYH @SaurianCYH]

Azhdarchidae
#paleoart

[ᴄʜʀɪs 🐳 @chrisstIawrence]

sei whales are so magical. like look at that dorsal fin

[tautonymph @tautonymph]

Chipping sparrow, chimney swift, loggerhead shrike 😸

[lu @evermoresunset]

hay gente que no tuvo que piratear skam por drive a los 14 años y se nota

[howls 🌕🦴 @howlsnteeth]

🐬🩵

[David Clark @d_g_clark]

New preprint: "Linear equivalence of nonlinear recurrent neural networks"
https://t.co/VpNYhbBGzi