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Julian Rossbroich

@jrbch.bsky.social
193 followers 223 following 4 posts

Postdoc at the Technical University of Munich. Enthusiastic rock climber and cat dad.

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Reposted by Julian Rossbroich
Rainer Friedrich @rainerfriedrichlab.bsky.social · 08/09/2026
New preprint by Tommaso: olfactory cortex (of zebrafish) represents not only odor information but also temporal context, and these multimodal representations are sharpened after learning. And check out Tommaso's new method for 2P imaging in awake adult zebrafish! www.biorxiv.org/content/10.6...
biorxiv.org
Joint experience-dependent representations of odors and temporal context in the zebrafish homolog of piriform cortex
Intelligent behavior requires experience-dependent internal representations of relevant information. We examined representational learning in telencephalic area pDp of adult zebrafish, the homolog of ...
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Johannes Felsenberg @felsenberg.bsky.social · 31/07/2026
Finally out in @natneuro.nature.com! A forgotten memory isn't always gone. We show that forgotten memories persist as silent memory traces, can be recovered by reminders, and can even be reconstructed into false memories. Excited to finally share this work! www.nature.com/articles/s41...
nature.com
Creating true and false memories from forgotten information in Drosophila - Nature Neuroscience
Forgotten memories in Drosophila persist as silent memory traces and can be recovered by reminder cues. Manipulating reminders can create false memories, showing that memory reconstruction flexibly in...
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Reza Shadmehr @rezashadmehr.bsky.social · 28/07/2026
If an action results in error, each neuron requires an individualized teaching signal that guides change in its output. This is the credit assignment problem of learning. Are there neurons in the brain that can compute such a sophisticated teaching signal? Yes. www.biorxiv.org/content/10.6...
biorxiv.org
Climbing fibers encode the gradient of a loss function for the cerebellum
Neurons in the brain are often many synapses away from motoneurons, yet if a movement results in error, each distant neuron needs a teacher that considers its specific contribution to production of th...
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Dan Goodman @neural-reckoning.org · 16/07/2026
New preprint (well, very updated). 🤖🧠🧪 We find that an abstract model of neuromodulation lets spiking neural networks perform much better, particularly in challenging noisy environments, using less energy. Relevant to #neuroscience and #neuromorphic computing. 🧵👇 www.biorxiv.org/content/10.1...
biorxiv.org
Neuromodulation enhances the capability and efficiency of spiking neural networks
Spiking neurons underlie the brain’s extreme energy efficiency, and therefore have great potential in neuromorphic computing, although realising this efficiency in practice has proven challenging. We ...
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Flavio Donato @flaviodonato82.bsky.social · 09/06/2026
Two brain circuits. Same learning problem. Shared learning outcomes. Different dynamical implementations. Our work shows that learning is not a single canonical solution but can emerge through distinct population dynamics shaped by circuit architecture. Excited to share our latest preprint! 🧵1/12
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Brad Hulse @bradkhulse.bsky.social · 21/05/2026
Story time friends... Ring attractor networks rely on fine-tuned symmetric connectivity. The fly head direction network has ring attractor dynamics but heterogeneous connectivity. How is this possible? 1/🧵 Link: www.biorxiv.org/content/10.6...
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Friedemann Zenke @fzenke.bsky.social · 06/05/2026
1/7 New paper accepted as ICML spotlight arxiv.org/abs/2605.03517! We unify self-supervised learning (SSL) algorithms (e.g., contrastive, VICReg, stopgrad) via latent distribution matching (LDM), which matches an induced latent distribution to an explicit latent model.
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Georg Keller @georgkeller.bsky.social · 15/04/2026
For nearly a century, we believed the therapeutic effect of ECT is the seizure. Our latest research suggests we may have been looking at the wrong event. A thread on why cortical spreading depression (CSD) might be the driver of therapeutic benefit. Work led by @therehugolad.bsky.social
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Todd Morrill @toddmorrill.bsky.social · 17/03/2026
Our new preprint on parallelizing training of temporally precise spiking neural networks is out! We show up to 44x speedups over a conventional sequential baseline. 1/N
Runtimes by batch size, hidden layer size, and parallel/serial computation
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Dan Levenstein @dlevenstein.bsky.social · 24/03/2026
Biology is full of coconuts. 🥥
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John Tuthill @tuthill.bsky.social · 24/03/2026
🧵 New preprint led by @bingbrunton.bsky.social, @elliottabe.bsky.social, @lawrencehu.bsky.social We gave a worm brain control of a fly body and it walked What did we learn? Nothing, other than deep reinforcement learning is effective We call it the digital sphinx www.biorxiv.org/content/10.6...
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in-code.bsky.social @in-code.bsky.social · 18/03/2026
‪Ever wondered how GABAergic interneurons shape cognition? The IN-CODE consortium's latest NeuroView article introduces a "population approach", shifting the focus from individual interneurons to cooperative networks. Dive into the future of interneuron research here: doi.org/10.1016/j.ne...
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Andrew Lampinen @lampinen.bsky.social · 17/03/2026
Pleased to share that our paper "Representation Biases: Variance is Not Always a Good Proxy for Importance" is now out as Theory/New Concepts paper in eNeuro! www.eneuro.org/content/13/3... 1/
eneuro.org
Representation Biases: Variance Is Not Always a Good Proxy for Importance
A central approach in neuroscience is to analyze neural representations as a means to understand a system's function, through the use of methods like principal component analysis, regression, and repr...
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Friedemann Zenke @fzenke.bsky.social · 12/03/2026
Come see our Cosyne 2026 posters! Friday: 2-069 (Atena & Manu), 2-096 (Julian), Saturday: 3-091 (Julia) More info zenkelab.org/2026/03/cosy...
zenkelab.org
Cosyne 2026 – Zenke Lab
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Matt Perich @mattperich.bsky.social · 10/03/2026
New paper hot off the (pre-)press! We dig into the evolutionary origins of neural computations for behavioral control across mice, monkeys, and humans: www.biorxiv.org/content/10.6.... As our lab's first foray into comparative analysis of neural dynamics, I’m super excited about this work! 1/18
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Henning Sprekeler @sprekeler.bsky.social · 19/02/2026
Happy to announce our latest preprint with Friedrich Schuessler and Simone Ciceri: www.biorxiv.org/content/10.6... A good part of animal behaviour and cognition is innate. Have you ever wondered how the underlying neural circuits develop? We may have a suggestion.
biorxiv.org
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Andrew Gordon Wilson @andrewgwils.bsky.social · 07/01/2026
We introduce epiplexity, a new measure of information that provides a foundation for how to select, generate, or transform data for learning systems. We have been working on this for almost 2 years, and I cannot contain my excitement! arxiv.org/abs/2601.03220 1/7
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Arman Behrad @armanbehrad.bsky.social · 08/01/2026
Wanna compare dynamics across neural data, RNNs, or dynamical systems? We got a fast and furious method🏎️ The 1st preprint of my PhD 🥳 fast dynamical similarity analysis (fastDSA): 📜: arxiv.org/abs/2511.22828 💻: github.com/CMC-lab/fast... I’ll be @cosynemeeting.bsky.social - happy to chat 😉
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Blake Richards @tyrellturing.bsky.social · 03/12/2025
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.)
Image of robots struggling with a social dilemma.
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Friedemann Zenke @fzenke.bsky.social · 27/11/2025
1/6 New preprint 🚀 How does the cortex learn to represent things and how they move without reconstructing sensory stimuli? We developed a circuit-centric recurrent predictive learning (RPL) model based on JEPAs. 🔗 doi.org/10.1101/2025... Led by @atenagm.bsky.social @mshalvagal.bsky.social
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Thomas Nowotny @drtnowotny.bsky.social · 25/11/2025
Excited to see the paper fully published. It's an important milestone for training SNNs with exact gradients, replacing our earlier tricks of a "delay line augmentation" to capture temporal relationships. Delays can now be learnt alongside weights naturally. Amazing work @mbalazs98.bsky.social !
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Dan Goodman @neural-reckoning.org · 07/08/2025
Spiking neural networks people, this message is for you! The annual SNUFA workshop is now open for abstract submission (deadline Sept 26) and (free) registration. This year's speakers include Elisabetta Chicca, Jason Eshraghian, Tomoki Fukai, Chengcheng Huang, and... you? snufa.net/2025/ 🤖🧠🧪
snufa.net
SNUFA 2025
Spiking Neural networks as Universal Function Approximators
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Martin Schrimpf @mschrimpf.bsky.social · 30/07/2025
What makes visual processing in the brain so powerful and flexible? Very excited to share our new work where we started from SOTA models that accurately predict dynamic brain activity during hours of video watching, and investigated core computations underlying visual perception
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Georg Keller @georgkeller.bsky.social · 14/07/2025
There might be a bit of misconception here. What the paper very convincingly shows is that visual cortex does not compute global oddball prediction errors and does not receive any top-down predictions that could be used to compute such prediction errors.
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Mari Sosa @marisosa.bsky.social · 12/06/2025
It's officially published!! In my main postdoc work with @markplitt.bsky.social and @lgiocomo.bsky.social, we found that the hippocampus simultaneously encodes an animal's spatial position and its experience relative to reward in parallel population codes. 🧵 www.nature.com/articles/s41...
nature.com
A flexible hippocampal population code for experience relative to reward - Nature Neuroscience
Sosa et al. find that hippocampal neural activity in mice encodes both environmental location and experience relative to rewards, spanning distances far from reward, through parallel and flexible popu...
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Tim Vogels @tpvogels.bsky.social · 02/06/2025
We just pushed “Memory by a 1000 rules” onto bioRxiv, where we use clever #ML to find #plasticity quadruplets (EE, EI, IE, II) that learn basic stability in spiking nets. Why is it cool? We find 1000s!! of solutions, and they don’t just stabilise. They #memorise! www.biorxiv.org/content/10.1...
biorxiv.org
Memory by a thousand rules: Automated discovery of functional multi-type plasticity rules reveals variety & degeneracy at the heart of learning
Synaptic plasticity is the basis of learning and memory, but the link between synaptic changes and neural function remains elusive. Here, we used automated search algorithms to obtain thousands of str...
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Antonio Falasconi @antofala.bsky.social · 28/05/2025
Forelimb movement control at the basal ganglia - brainstem interface! Happy to finally share this work from me and @harsh-kanodia.bsky.social with Silvia Arber! @biozentrum.unibas.ch @fmiscience.bsky.social www.nature.com/articles/s41...
nature.com
Dynamic basal ganglia output signals license and suppress forelimb movements - Nature
Basal ganglia output neurons fire dynamically in bidirectional and movement-specific patterns to license forelimb movements. 
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Aaron Milstein @neurosutras.bsky.social · 27/05/2025
New #NeuroAI #compneurosky preprint! To better understand how target-directed learning works in the brain, we sought to engineer an artificial neural network capable of solving complex image classification tasks that comprises only experimentally-supported biological building blocks. (1/15)
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Julian Rossbroich @jrbch.bsky.social · 27/05/2025
I've spent much of my PhD thinking about E/I balance, and our latest preprint represents the culmination of that journey. Huge thanks to @fzenke.bsky.social for guiding me. Looking forward to your thoughts & comments.
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Robert Rosenbaum @robertrosenbaum.bsky.social · 19/05/2025
New preprint with my postdoc, Navid Shervani-Tabar, and former postdoc, Marzieh Alireza Mirhoseini. Oja’s plasticity rule overcomes challenges of training neural networks under biological constraints. arxiv.org/abs/2408.08408
arxiv.org
Oja's plasticity rule overcomes several challenges of training neural networks under biological constraints
Deep neural networks have achieved impressive performance through carefully engineered training strategies. Nonetheless, such methods lack parallels in biological neural circuits, relying heavily on n...
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Mashbayar Tugsbayar @tmshbr.bsky.social · 15/04/2025
Top-down feedback is ubiquitous in the brain and computationally distinct, but rarely modeled in deep neural networks. What happens when a DNN has biologically-inspired top-down feedback? 🧠📈 Our new paper explores this: elifesciences.org/reviewed-pre...
elifesciences.org
Top-down feedback matters: Functional impact of brainlike connectivity motifs on audiovisual integration
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Jérôme Lecoq @jeromelecoq.bsky.social · 15/04/2025
How does our brain predict the future? Our review of predictive processing + research program is now on arXiv arxiv.org/abs/2504.09614 50+ neuroscientists distributed across the world worked together to create this unique community project.
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Annabelle Singer @drannabellesinger.bsky.social · 09/04/2025
Check out our latest paper today in Nature: “Goal specific hippocampal inhibition gates learning” www.nature.com/articles/s41... By Nuri Jeong, Xiao Zheng, Abby Paulson, Steph Prince and colleagues.
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Ezekiel Williams @ezekielwilliams.bsky.social · 25/03/2025
1/7: Super excited to share our new paper! This one should be of interest to neuroscientists and deep learning theory folks. This paper was a collaboration with Alexandre Payeur, @averyryoo.bsky.social, Thomas Jiralerspong, @mattperich.bsky.social, Luca Mazzucato, @glajoie.bsky.social
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Emerson Harkin @efharkin.bsky.social · 27/03/2025
I'm excited to share that the last chapter of my PhD thesis is now published in Nature! 🍾 What drives serotonin neurons? We think it's the expectation of future reward and --- critically --- how fast this expectation is increasing. 📈 doi.org/10.1038/s415... 1/6
doi.org
A prospective code for value in the serotonin system - Nature
Merging ideas from reinforcement learning theory with recent insights into the filtering properties of the dorsal raphe nucleus, a unifying perspective is found explaining why serotonin neurons are ac...
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