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jzv.bsky.social
Theoretical neuroscientist; currently a Harvard Junior Fellow. jzv.io
8 posts 557 followers 362 following
Prolific Poster

Honoured to have been selected as a #SloanFellow Thankful for all the support from family, mentors, collaborators, colleagues and students along the way! @sloanfoundation.bsky.social

Yes, many worrying things happening in science that should take priority in grabbing our attention - but we are worried precisely because scientific knowledge is worth creating. In that spirit, I am proud to highlight our latest @biorxivpreprint.bsky.social preprint! #neuroscience 🧪

New preprint: "The geometry of the neural state space of decisions", work by Mauro Monsalve-Mercado, buff.ly/42wVHD5. Surprising results & predictions! (Thread) We analyze neuropixel population recordings in macaque area LIP during a reaction time, random-dot motion 1/

Theory in neuroscience, you say? How about this preprint by @david-g-clark.bsky.social, with a couple of others you might recognize? :-) #neuroscience

The thing is “cancer research” is *incredibly* popular. Everyone knows people with cancer. This is slam dunk shit.

Excited to welcome @sueyeonchung.bsky.social to Harvard!! She will be at the @kempnerinstitute.bsky.social and the Center for Brain Science. We are very lucky!!

Our perspective on designing electronic noses inspired by natural olfaction! #neuroscience #ChemSky 🧪

Recently posted an updated version of arxiv.org/abs/2306.13326 on `Solving systems of Random Equations' I find this a really useful model to gain intuition into the behavior of optimization algorithms in high-dimensional overparametrized landscapes, as the ones arising in modern machine learning.

Thanks to the yield of U arrays, we were able for the 1st time AFAIK to average across neurons (not trials) and see memory bumps on single trials. Look at this 😍 Not the focus of the work but it taps into an open debate on the neural mech. of WM cf @cconstan.bsky.social @earlkmiller.bsky.social

1/ Super-excited to share our new work “Episodic and associative memory from spatial scaffolds in the hippocampus”, that just appeared in Nature! www.nature.com/articles/s41... Key insights and ideas 👇#tweeprint

Very cool paper on Manx shearwater flight strategies! Also cool that the first & corresponding author @stephharris.bsky.social lists their BlueSky handle in the affiliations :-) 🧪

Happy head direction cell day y’all! On this day, 41 years ago, Jim Ranck recorded the first “HD cell” in his Brooklyn lab in 1984. Jim shared the news with the world at SFN that year, showing a video of the cell’s firing on a TV he somehow acquired and brought to his poster… (1/3)

A summary of my thinking on shared prosperity, work and AI in ten bullet points.

Yes it's important people understand a preprint hasn't been peer-reviewed. BUT it's also important to understand that what "peer-reviewed" means varies considerably, in some cases signifying nothing... www.science.org/content/arti...

663 days since the senseless tragedy that took An, we present a manuscript that reports some of the discoveries that she left us. www.biorxiv.org/content/10.1...

Here is the link for the "back-story" for a paper we published in 2024. It was in collaboration with Feng Chen (Stanford), Shaul Druckmann (Stanford) and Michael Long (NYU). This is my first attempt at doing this. Feedback welcome. www.arkabanerjeelab.com/_files/ugd/c...

Key-value memory is an important concept in modern machine learning (e.g., transformers). Ila Fiete, Kazuki Irie, and I have written a paper showing how key-value memory provides a way of thinking about memory organization in the brain: arxiv.org/abs/2501.02950

Interested in theoretical neuroscience or machine learning but come from a non-quantitative background? This summer school is for you! Learn the foundational theory needed to excel in a quantitative PhD in 7 weeks. Apply by feb 7!

ML methods are an asset in analysing numerically glassy dynamics - a notoriously difficult physics problem. If you want to know more on recent results and future directions, check out our "Roadmap on machine learning glassy dynamics", just appeared on Nature Reviews www.nature.com/articles/s42...

I wish the government would understand that open access mandates are (on their own) invitations for profit-seeking publishers to gouge authors, universities, and funders by charging exorbitant fees. The government should directly support open access publishing, so that they can control costs.

🚨Our paper on how the cerebellum learns to drive cortical dynamics for rapid task learning and switching, which we propose can then be consolidated in the cortex @naturecomms.bsky.social nature.com/articles/s41... 🧠 #compneuro

Can the motor system use sensory expectations to prepare for unexpected events? Excited to share my latest work with @andpru.bsky.social – where we establish that sensory expectations shape neural population dynamics in motor circuits! 🧵 and paper below 1/

Honored that a piece I wrote made it to NYTimes. It’s about how my mom’s stroke changed my connection to time, science, and nature. What a privilege to honor my mom in Modern Love. Below is a gift link. Let me know your thoughts 🙏🏼 www.nytimes.com/2024/12/20/s...

1/3 How does visual input affect the heading direction (HD) network? In our latest lab preprint, Ryosuke presents "visual landmarks" to larval zebrafish and shows that the HD network tethers to the visual environment. The experiments are again inspired by the beautiful recent work in Drosophila.

Today, the SFI Press published Vol. 4 of Foundational Papers in Complexity Science. This concluding book follows Volumes 1 & 2 in May and Volume 3 in September & contains papers published between 1989 and 2000 — when complex-systems science had become a fledgling field of study in its own right.

Delighted to highlight our new paper in @natureportfolio.bsky.social entitled 'Synaptic basis of feature selectivity in hippocampal neurons' (thread below 👇): www.nature.com/articles/s41...

If you are into ML theory (RL or not) with a proven track record, and you are interested in an industry research position, PM me. Feel free to spread the word.

Our preprint with @frostedblakess.bsky.social, @jzv.bsky.social, @cpehlevan.bsky.social is out! We develop a simple reinforcement learning model that recapitulates 3 disparate hippocampal dynamics. With ablation studies, these representations improve the speed and flexibility of policy learning.

trying out some physics on Sora, OpenAI's video-creation-from-text-tool. Here is "a blue block falling on a green sphere"

Serendipitous alignment of 3 non-traditional funders... among other unlikely events!😄 I agree with the premise of this thread but it omits a crucial element of 'bottom up' catalysis that enabled generation of the FAFB-FlyWire dataset. It was not a centrally planned project. 1/2

Excited to share my #NeurIPS2024 paper with @jzv.bsky.social, @BenjaminSRuben, and @cpehlevan.bsky.social on mechanistic mismatches in data-constrained models of neural dynamics! (1/n)

The third edition of my textbook, Nonlinear Dynamics and Chaos, was published today. You can preview the first 68 pages on Google Books, or take a look at the preface below to see what's new. The main new thing is a chapter on the Kuramoto model! Hope you enjoy it.

this holiday season I am thankful that, rather than fixing the literally decade-old problem of multi-file search, Overleaf instead implemented the world's worst writing assistance tool

How do interneurons reshape neural responses? I'm excited to present work with @eerosim.bsky.social at #NeurIPS2024 that proposes a nonlinear recurrent circuit model motivated by efficient coding theory. Poster: 4:30p on Fri, Dec 13 Paper: openreview.net/forum?id=ojL...

The Undergrad Travel Grant Program (deadline: Dec 6th) provides an opportunity for undergrads to learn more about comp systems neuro. It’s especially suited for students considering neuro graduate study! Apply here: docs.google.com/forms/d/e/1F... More info: www.cosyne.org/travel-grants

Optimal transport computes an interpolation between two distributions using an optimal coupling. Flow matching, on the other hand, uses a simpler “independent” coupling, which is the product of the marginals.

What a beautiful paper: www.cell.com/cell-reports.... As I've said before, the deeply ingrained ideology of "brain is noisy, unreliable, chaotic..." has led us in the wrong direction.

Alex Pouget and I wrote a perspective a few years ago on Major Sources of Computational Complexity in Complex Decision-Making 🧠. We never got around to publishing it, and so now uploaded it to OSF Preprints: doi.org/10.31219/osf.... I hope some of you might find it useful.

Sometimes I think the most important thing a computational neuroscientist can do to encourage acceptance of their work in the broader experimental community is just to plot their model data in the exact same way the relevant experimental data was plotted. It's very affecting!

Interesting discussion on whether or not keeping raw data (seems like we all agree we should!)

Our new paper in PhysRevX at @apsphysics.bsky.social uses replica theory, cavity method, supersymmetry, Kac-Rice formula, Dyson's Brownian motion & high dimensional geometry to show how an Ising machine of coupled photons finds near spin glass ground states journals.aps.org/prx/abstract...

I have an opening for an NIH-funded postdoc position in my group at Harvard CBS! If you're interested in theory for neural computation - particularly computation through dynamics - please reach out! Official ad coming soon, for now see jzv.io 🧠

For me, it wasn’t a book; it was a paper by David Robinson “A model of the smooth pursuit eye movement system.” As an undergrad studying control theory in Iran, it was such a fresh air to see these ideas applied to something other than oil & gas plants.

It's a good time to build local communities. Starter pack for neuroscientists at Harvard. I am sure I'm missing many folks; let me know. go.bsky.app/VcFhesD

The concept of system state is fundamental in theories of control and computation. I wrote down a few thoughts on the history of this idea and its connections to rationalist and empiricist perspectives in philosophy.