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Julien Corbo

@juliencorbo.bsky.social
133 followers 242 following 12 posts

Neuroscience Research Associate @Polack lab, Rutgers university. Sensory processing, cortex, perception He/him

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Julien Corbo @juliencorbo.bsky.social · 13/03/2026
A preview of orthogonalized trajectories in neural activity space after learning a Go/NoGo orientation task. Here the Go/NoGo angle is 30°, and so are the trajectories in Naive animals, but after training their angle grows close to 90°.
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Julien Corbo @juliencorbo.bsky.social · 13/03/2026
@lrcaglar.bsky.social and I will be showing new results demonstrating geometric reshaping of populations responses in order to support task computations happens as early as V1 @batuhanerkat.bsky.social @polacklab.bsky.social #Cosyne2026
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Reposted by Julien Corbo
Gergo Orban @gergoorban.bsky.social · 13/02/2026
Fun paper at @iclr-conf.bsky.social on delicate V1 biases through contextual priors. Inspiring collab w @polacklab.bsky.social, spearheaded by Keith Murray & Balazs Meszena, @juliencorbo.bsky.social. Kudos to conf ACs&PCs for pulling of 19k reviews under openrev turmoil arxiv.org/abs/2602.11956 1/2
arxiv.org
TAVAE: A VAE with Adaptable Priors Explains Contextual Modulation in the Visual Cortex
The brain interprets visual information through learned regularities, a computation formalized as probabilistic inference under a prior. The visual cortex establishes priors for this inference, some d...
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Reposted by Julien Corbo
Kristian G. Andersen @kgandersen.bsky.social · 14/02/2025
"the extremely strong desire is to just punish universities [..] It’s not based on any kind of coherent policy agenda. It’s just a desire to inflict pain." This, is critical to understand. Pointing out "it's hurting us" won't do, since it's the whole point. www.nytimes.com/2025/02/14/o...
nytimes.com
Opinion | Trump Wants to Destroy All Academia, Not Just the Woke Parts (Gift Article)
The administration’s war on universities defies rational self-interest.
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Reposted by Julien Corbo
Stephen Curry @scurry.bsky.social · 11/02/2025
OK folks, I have now created a google form that allows people to sign to show their support for my open letter to the President of the Royal Society. Please sign and share widely: forms.gle/miDciq35oxyw...
forms.gle
Open letter to the President of the Royal Society – time to stand up for your values
If you wish to show your support for the letter below regarding apparent inaction by the Royal Society in the face of breaches of its code of conduct by Elon Musk FRS, please sign below. I invite anyo...
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Reposted by Julien Corbo
Tim Verstynen @tdverstynen.bsky.social · 22/01/2025
Wikipedia is one of the last major bastions of verified information. Which, of course, is why the oligarchs want to destroy it. You can donate to them here. donate.wikimedia.org/w/index.php?...
donate.wikimedia.org
Make your donation now - Wikimedia Foundation
Donate to the Wikimedia Foundation, the nonprofit that hosts Wikipedia and other crucial free knowledge projects. Each year, the generosity of the 2% of readers who donate allows us to expand the reac...
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Reposted by Julien Corbo
Pierre-Olivier Polack @polacklab.bsky.social · 08/01/2025
Congratulations to @juliencorbo.bsky.social and all the co-authors for this amazing study! 🎉🏅🤯. Don’t miss Julien’s thread 🧵 👇🏻 that summarizes very well the main points of the paper.
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Julien Corbo @juliencorbo.bsky.social · 08/01/2025
Please check out the paper (and the supplementary figures) there is a ton more to this story that could not fit in a post! #neuroskyence #visualcortex #sensory #perception
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Julien Corbo @juliencorbo.bsky.social · 08/01/2025
What shapes the discrete domains? Surround suppression in orientation space! Neurons preferring orientations flanking task stimuli are less responsive, creating a W-shaped modulation reshaping representations. Distortions not present in Naïve 🐭, their orientation representation space was more “flat”
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Julien Corbo @juliencorbo.bsky.social · 08/01/2025
Does activity in these domains drive behavior? We computed a "Go evidence" ratio: relative activation of Go & NoGo domains. It explained ~90% of the variance of perceptual decisions, as if V1 outputs probabilistic Go/NoGo estimates! Suggests discrete, domain-based integration of V1►sensory decisions
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Julien Corbo @juliencorbo.bsky.social · 08/01/2025
When task is difficult (NoGo° close to Go°), V1 doesn't encode stim orientation faithfully. Discrete domains emerge: "Go" (~45°) & a "NoGo" (~90°) in which the activity is constrained. Surprisingly NoGo resp. are bimodal-hinting at categorical processing. Not observed in Naïve 🐭 passively viewing
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Julien Corbo @juliencorbo.bsky.social · 08/01/2025
Behavioral thresholds vs. neuronal capacity: Mice trained in a Go/NoGo orientation task showed discrimination threshold between 15°–30°. But V1's neural activity contained more information; shallow neural nets trained on V1 data vastly outperformed behavior ➡️ at 20° angle, SNN D'>4, Mouse D'< 1.7
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Julien Corbo @juliencorbo.bsky.social · 08/01/2025
Through task training, V1 transitions from continuous to categorical representations that predict the 🐭 behavioral performance. Task-driven excitability modulation splits the evoked activity into discrete domains, suggests a probabilistic encoding of the stimuli category (Go/NoGo). More details in 🧵
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Julien Corbo @juliencorbo.bsky.social · 08/01/2025
New paper out! 🚨 📰 With @batuhanerkat.bsky.social, John McClure, @hussainyk1.bsky.social, @polacklab.bsky.social we reveal how discretized representations in V1 predict suboptimal orientation discrimination. 🧪🧠🐭 This work reconciles neuro and psychometric curves www.nature.com/articles/s41...
nature.com
Discretized representations in V1 predict suboptimal orientation discrimination - Nature Communications
How animals generate perceptual decisions remains poorly understood. Here, the authors show that during a discrimination task, the mouse visual cortex does not encode the orientations of the cues but ...
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Julien Corbo @juliencorbo.bsky.social · 08/01/2025
That sounds cool! What's the paper ref? We didn't look at correlations per se but learning reduces the trial to trial variability of the responses, which I'm sure goes along with more correlated ensembles.
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Julien Corbo @juliencorbo.bsky.social · 08/01/2025
Probably one of the most known already, but Brain inspired never fails to inspire me @braininspired.bsky.social
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Reposted by Julien Corbo
Alexis Paez @palexis.bsky.social · 08/01/2025
The wonders of population coding! Recent paper by @juliencorbo.bsky.social et al. @polacklab.bsky.social -> visual cortex in trained mice encodes orientation differently from in naive mice... almost more "messily"(?)... but behavior is good. #neuroskyence #matlab 🧪 🧠 doi.org/10.1038/s414...
doi.org
Discretized representations in V1 predict suboptimal orientation discrimination - Nature Communications
How animals generate perceptual decisions remains poorly understood. Here, the authors show that during a discrimination task, the mouse visual cortex does not encode the orientations of the cues but ...
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Julien Corbo @juliencorbo.bsky.social · 07/01/2025
Am I too late to the party?
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