Arna Ghosh

🚨🧠 Our paper is out! We introduce a simple computational model that generates macroscopic, long-timescale dynamics as seen in large-scale neural recordings. #neuroscience #dynamics @marius10p.bsky.social @zhong-lin.bsky.social @hhmijanelia.bsky.social Link: go.nature.com/4tRNjIu

Here's what I think everyone is missing about this issue: Prediction is how we identify understanding! If we had a model that could do OOD prediction, then we would rightly say it understands. Of course, that doesn't mean understanding *necessarily* emerges from training to predict. #NeuroAI

New preprint out 🎉 What happens to the hippocampal “place code” when an animal is actively engaged in a task? The answer surprised us (and might surprise you too!). Let's dive in ⬇️ Link: "Hippocampal trace coding dominates and disrupts place coding" www.biorxiv.org/content/10.6...

🧪🧠 New preprint: helping resolve a decades-long debate in synaptic plasticity NMDA receptors are central to Hebbian learning. Yet for >30 years, the existence and function of presynaptic NMDA receptors have remained controversial. 📄 doi.org/10.64898/202... 1/6

New paper out at PNAS: www.pnas.org/doi/10.1073/... Revisiting the high-dimensional geometry of population responses in the visual cortex with @jpillowtime.bsky.social. The review took forever because a reviewer was doubtful our new estimator can infer eigenvalues beyond the rank of the data! (1/6)

Are you thinking about doing neuroscience outreach but want to make it more exciting or hands on? Check out RetINaBox! (A collab led by the Trenholm lab) We tried to bring the experience of experimental neuroscience to a classroom setting: www.eneuro.org/content/13/1... #neuroscience 🧪

Whoaaa!! This is a fantastic effort, and an amazing resource. Huge congratulations to the authors! 🎉

Last day of poster sessions and presentations at @neuripsconf.bsky.social. Full schedule featuring Mila-affiliated researchers presenting their work at #NeurIPS2025 here mila.quebec/en/news/foll...

In San Diego attending #NeurIPS2025? Come to our poster to talk more about representation geometry in LLMs. 😃 🗓️ Friday 4:30-7:30 pm session 📍 Exhibit Hall C, D, E 🏁 Poster # 2502

(1/n) We are excited to share our new paper in Nature Communications, by Hagar Lavian (@hlavian.bsky.social) and team, revealing how the zebrafish brain integrates visual navigation signals! www.nature.com/articles/s41...

1/ Why does RL struggle with social dilemmas? How can we ensure that AI learns to cooperate rather than compete? Introducing our new framework: MUPI (Embedded Universal Predictive Intelligence) which provides a theoretical basis for new cooperative solutions in RL. Preprint🧵👇 (Paper link below.)

Population coding 🙌

How I contributed to rejecting one of my favorite papers of all times, Yes, I teach it to students daily, and refer to it in lots of papers. Sorry. open.substack.com/pub/kording/...

This is an excellent blueprint on a very fascinating use of AI scientist! And the results and super cool and interesting! 🤩 I have been asked this when talking about our work on using powerlaws to study representation quality in deep neural networks, glad to have a more concrete answer now! 😃

Conrad Hal Waddington was born OTD in 1905. His “epigenetic landscape” is a diagrammatic representation of the constraints influencing embryonic development. On his 50th birthday, his colleagues gave him a pinball machine on the model of the epigenetic landscape. 🧪 🦫🦋 🌱🐋 #HistSTM #philsci #evobio

I’m looking for interns to join our lab for a project on foundation models in neuroscience. Funded by @ivado.bsky.social and in collaboration with the IVADO regroupement 1 (AI and Neuroscience: ivado.ca/en/regroupem...). Interested? See the details in the comments. (1/3) 🧠🤖

A tad late (announcements coming) but very happy to share the latest developments in my previous preprint! Previously, we show that neural representations for control of movement are largely distinct following supervised or reinforcement learning. The latter most closely matches NHP recordings.

Very cool study, with interesting insights about theta sequences and learning!

Together with @repromancer.bsky.social, I have been musing for a while that the exponentiated gradient algorithm we've advocated for comp neuro would work well with low-precision ANNs. This group got it working! arxiv.org/abs/2506.17768 May be a great way to reduce AI energy use!!! #MLSky 🧪

This looks like a very cool result! 😀 Can't wait to read in detail.

Fantastic work on Multi-agent RL from @dvnxmvlhdf5.bsky.social & @tyrellturing.bsky.social! 🤩

Our team is hiring in Zurich! www.google.com/about/career...

Also, big shoutout to @quentin-garrido.bsky.social+gang and @aggieinca.bsky.social+gang for developing Rankme and Lidar, respectively. Reptrix incorporates these representation quality metrics. 🚀 Let's make it easier to select good SSL/foundation models. 💪

Super cool paper! It formalizes a lot of ideas I have been mulling over the past year, and connects tons of historical ideas neatly. Definitely worth a read if you are working/interested in mechanistic interp and neural representations.

Just giving this a boost for those who may not have seen it yet... we have a PI position (molecular and cellular basis of cognition) at The Hospital for Sick Children (Toronto). The position comes with an appointment at Assist/Assoc Prof level at U of T. Share widely! can-acn.org/scientist-se...

Come say hi at the noon poster session today in the East hall, poster #2201. 🚀 #NeurIPS2024