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Joao Barbosa

@jbarbosa.org
3.9K followers 972 following 1.5K posts

INSERM group leader @ Neuromodulation Institute and NeuroSpin (Paris) in computational neuroscience. How and why are computations enabling cognition distributed across the brain? Expect neuroscience and ML content. jbarbosa.org parisneuro.fr

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Joao Barbosa @jbarbosa.org · 25/09/2026
Jeanne Sentenac: how do you pull one item out of working memory? In low-rank RNNs, the cue breaks the memory plane attractor and rotates the relevant subspace onto the readout. poster #247
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Joao Barbosa @jbarbosa.org · 25/09/2026
Clara Hornung: nucleus basalis stimulation broadens single-neuron tuning yet improves working memory. How come? We find an explanation: at the population level it widens the angle between target and distractor coding directions in dlPFC. Better separation doesn't imply stronger code poster #341
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Joao Barbosa @jbarbosa.org · 25/09/2026
@arghavanaslani.bsky.social : working memory codes sit all over cortex, but only PFC, LIP and FEF decoding errors track behavioral error trial by trial but stable sensory codes don't. poster #343
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Joao Barbosa @jbarbosa.org · 25/09/2026
Philipp Werthmann: "everything is everywhere" is still compatible with local computation. Data-constrained RNNs across 6 monkey areas trace motion from MT, color from V4, choice from LIP, and task context broadcast by dlPFC. poster #342
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Joao Barbosa @jbarbosa.org · 25/09/2026
Bruna Lopes: shape distances compare neural population geometry across regions and animals across many datasets and reveal previously hidden patterns. poster #340
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Joao Barbosa @jbarbosa.org · 25/09/2026
Lubna S. Abdul: across 7 cortical areas, monkeys' flexible categorization carries current trial signals everywhere, but history signals remain only in PFC which holds prospective, retrospective and reward signals in 3 orthogonal subspaces. poster #339
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Joao Barbosa @jbarbosa.org · 25/09/2026
@mtschiersch.bsky.social : both prefrontal hemispheres redundantly store the whole visual field -- until load exceeds capacity, when they split items and specialize. Monkey recordings + a two-area ring attractor model, with the key prediction confirmed in monkey and humans. poster #289
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Joao Barbosa @jbarbosa.org · 25/09/2026
I am sad to miss @bernsteinneuro.bsky.social conference this year, but please consider checking out the work from our lab and collaborations. We'll bring 7 posters, check the details below if interested and go say hi to the first authors! abstracts.g-node.org/conference/B...
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Joao Barbosa @jbarbosa.org · 10/09/2026
Very cool! But you could have called both cities Barcelona 😀
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Joao Barbosa @jbarbosa.org · 04/09/2026
Here’s a google docs: l1nk.dev/hk1mx6e If you lose this post, remember my home page (jbarbosa.org) I link this document there, too. It is still a work in progress, but I will try to update it as I find out new things. If you find something unclear or just wrong, don’t hesitate to comment on it!
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Joao Barbosa @jbarbosa.org · 04/09/2026
Looking for a (neuroscience) PI position in France? You still have time to do it this year, but you need to act fast. If you have no idea how to do it, start by reading this! l1nk.dev/hk1mx6e 1/
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Joao Barbosa @jbarbosa.org · 01/06/2026
Arguing if the brain is really a computer sounds a bit silly but the analogy is as old as the computer itself
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Joao Barbosa @jbarbosa.org · 23/04/2026
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Joao Barbosa @jbarbosa.org · 22/04/2026
If you are attending this year @fens.org in Barcelona 😎 check this satellite event organized by the systems & comp neuro community @barccsyn.bsky.social. Pretty nice line up, despite that JB who I am told gives terrible talks...
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Joao Barbosa @jbarbosa.org · 03/04/2026
Paris is a great place to do neuroscience, across all subfields.
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Joao Barbosa @jbarbosa.org · 03/04/2026
Wanna do neuroscience in Paris but can't find interesting lab? Want to come do a sabbatical but don't know who to collaborate? Check this webpage aggregating ~all the neuroscience labs (+200) in Paris. ⚠️only the information of 'verified' profiles is reliable⚠️ Please retweet 🙏 parisneuro.fr
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Joao Barbosa @jbarbosa.org · 27/03/2026
I love them but had no idea they looked like this. Also 😂:
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Joao Barbosa @jbarbosa.org · 26/03/2026
LOL
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Joao Barbosa @jbarbosa.org · 26/03/2026
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Joao Barbosa @jbarbosa.org · 26/03/2026
yeah that's the only explanation for the correlation between left-right, pet ownership and living in boring expensive, neighbourhoods. ...or maybe its this (thanks Claude)
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Joao Barbosa @jbarbosa.org · 25/03/2026
Next to nice places to eat/drink in Paris (IMO & friends suggestions).
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Joao Barbosa @jbarbosa.org · 25/03/2026
A heat map of left vs right Parisian voters put next to a heat map of number of cats in Paris for no particular reason
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Joao Barbosa @jbarbosa.org · 23/02/2026
I was sure the illusion would break at some length: can't keep grow forever, right? Wrong. My brain hurts.
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Joao Barbosa @jbarbosa.org · 21/02/2026
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Joao Barbosa @jbarbosa.org · 28/01/2026
Thank you Nicole! Nicole's wonderful book 'Elusive Cures' has played an important role in pushing me out of my comfort zone and join forces w/ @philippedomenech.bsky.social and @bellecguill.bsky.social, here. Exciting times ahead for neuroscience. Go read it, if you haven't yet!
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Joao Barbosa @jbarbosa.org · 27/01/2026
Postdoc position in Paris: come help develop new generation human brain computer interfaces ⚡🧠💻 Interested? Contact me if you have experience with machine learning (e.g. simulation-based inference, RL, generative/diffusion models) or dynamical systems. See below for + details and retweet 🙏
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Joao Barbosa @jbarbosa.org · 17/12/2025
Reminds me of this meme :)
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Joao Barbosa @jbarbosa.org · 13/12/2025
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Joao Barbosa @jbarbosa.org · 27/11/2025
😂
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Joao Barbosa @jbarbosa.org · 19/11/2025
"ASS is inviting scientists who are active in academic activities to serve as editorial members" is ASS the 'best' predatory journal around?
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Joao Barbosa @jbarbosa.org · 09/10/2025
I think I will miss a meeting at 17.30 Nov 6...🙈
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Joao Barbosa @jbarbosa.org · 26/09/2025
Finally, Jeanne Sentenac will show how low rank RNNs provide a really neat explanation for information selection within 'orthogonal subspaces' - purely theoretical work but heavily inspired by mattpanichello.bsky.social beautiful paper This will be P II 58
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Joao Barbosa @jbarbosa.org · 26/09/2025
Philipp Werthmann will use low-rank RNN fit to large scale recordings, to show that even when 'everything is everywhere', different regions have different functions. A lot of push back on the everything is everywhere mantra, as you can see 🤓 @pessoabrain.bsky.social @benhayden.bsky.social P III 13
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Joao Barbosa @jbarbosa.org · 26/09/2025
Lubna Abdul Parveen will present her PhD project on analysis of errors in the Mante task and decoding analyses form 6 regions of the monkey brain. She will show clear evidence that everything is not always everywhere. This will be P IV 22.
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Joao Barbosa @jbarbosa.org · 26/09/2025
On the second (Mon), I will show how low-rank RNN fit to data are a useful tool to ask hard questions, such as studying communication subspaces from large scale recordings or the effect of neuromodulators on population dynamics. This workshop is organized by @rdgao.bsky.social and Manuel Brenner.
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Joao Barbosa @jbarbosa.org · 26/09/2025
On the first workshop talk (Monday), I'll make the case that everything might be everywhere when you decode, but that is not the end of the story: different regions have very different dynamics and encoding geometries. This workshop is organized by @aitormg.bsky.social and @ackurth.bsky.social
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Joao Barbosa @jbarbosa.org · 26/09/2025
Very cool, congratulations! Ps: that behavioral map looks like the map of Paris 🤓
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Joao Barbosa @jbarbosa.org · 18/09/2025
Just showing off how my office looks when we DON'T work until late 😎
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Joao Barbosa @jbarbosa.org · 15/09/2025
Just showing off how my office looks when I work until late🤓
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Joao Barbosa @jbarbosa.org · 15/09/2025
We asked (and partially answered?) this question during covid in this paper jbarbosa.org/files/Barbos... Back then @yaelniv.bsky.social's repo was the best nimh-dsst.github.io/OpenCogData/
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Joao Barbosa @jbarbosa.org · 14/09/2025
It's sad to leave Berlin behind but the move to Frankfurt came with no more online Bernstein? Why? 😭 @bernsteinneuro.bsky.social
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Joao Barbosa @jbarbosa.org · 06/09/2025
I recently learned: w/ lesioned 8A, you can do many WM tasks but not one👇 Guess what happens when you decoding from 8A during each of these tasks? They are all the same. Decoding is like a quality check, it provides almost no info about function scholar.google.com/citations?vi...
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Joao Barbosa @jbarbosa.org · 11/08/2025
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Joao Barbosa @jbarbosa.org · 10/08/2025
Sad to miss #CCN2025. It will be the 1st conference where a PhD working w/ me will speak 😭 go see Lubna's talk (Friday) about distributed neural correlates of flexible decision making in 🐒, work done in collaboration w/ @scottbrincat.bsky.social @siegellab.bsky.social & @earlkmiller.bsky.social
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Joao Barbosa @jbarbosa.org · 08/08/2025
He's right, this is PhD level (lack) of math skills
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Joao Barbosa @jbarbosa.org · 08/08/2025
Wrong 1st screenshot 🥲
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Joao Barbosa @jbarbosa.org · 08/08/2025
"it's completely b-less!" 😂
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Joao Barbosa @jbarbosa.org · 08/08/2025
Hey look, chat gpt 5 is still an idiot. It would be great to have a control condition for tech hyped BS: Say openAI just copy pastes gpt N and says it's N+1. How many would say it's amazing?
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Joao Barbosa @jbarbosa.org · 01/08/2025
Only a metal band, of the best kind, chooses a text like this for the press release of their new album ✊🖤
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Joao Barbosa @jbarbosa.org · 30/07/2025
Seen at @nikolaskaralis.bsky.social
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