Nosrat Mohammadi
@nosrat.bsky.social
Postdoctoral researcher in computational neuroscience, university of Geneva. Studying the compositional properties of syntax. Neural manifolds and emotions! webpage: nosratullah.github.io
Study finds that when a network with low-dimensional structure receives outside input or is perturbed by noise, it can produce either high- or low-dimensional responses depending on the finer structure of the network and its input. Read the study: https://go.aps.org/4fT3NLA
Pyramidal cells in the cortex send a long apical dendrite to layer 1. What is its role? What happens when it's gone? ✂️ A causal spatial role for apical dendrites in the cortex Out today with @kenneth-harris.bsky.social, @carandinilab.net and @fedrossi.bsky.social www.biorxiv.org/content/10.6...
A causal spatial role for apical dendrites in the cortex
Cortical pyramidal neurons project a long apical dendrite to layer 1 (L1), to receive synaptic inputs that are thought to provide contextual and possibly suppressive modulation. In visual cortex, thes...
biorxiv.org
🎉 *extremely* excited to share our human single neuron + movie dataset is out in #ScientificData! 📄 Human neuron activity during an 83-minute movie from 2,286 neurons and 29 patients 🔗https://www.nature.com/articles/s41597-026-07955-0 1st public dataset from @humansingleneuron.bsky.social!🧵
How do you "see" with electric eyes? How does collective behavior emerge from individual interactions? Nocturnal weakly electric fish evolved to do this, but studying naturalistic social behavior is very hard. Our solution? Virtual 'fish' 🤖🐟⚡ 📄 arxiv.org/abs/2511.08436
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...
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...
biorxiv.org
Happy Monday! Come learn how jellyfish swim. In a review led by fluid dynamics maestro Alex Hoover, we outline how neuromechanical modeling will help us understand how modulation of neural activity allows jellyfish to jet and pirouette through fluids www.sciencedirect.com/science/arti...
New preprint! What the eyes do when searching for a visual target reveals the psychological similarity between objects, just like more classic (but much longer & tedious) tasks like triplet odd-one-out and direct comparison. www.biorxiv.org/cgi/content/... #BRAINFLOW @upcite.bsky.social @cnrs.fr
Eye movements reveal representational geometry
Mental representations are the explanatory construct of the cognitive sciences, but there is no widely accepted characterization of how they cause behavior. Visual representational geometry can be quantified by similarity scores, but almost all methods require an explicit judgment. To examine how representations cause behavior by varying task demands, observers must perform different tasks while continuously reporting similarity, leading to dual-task interference. This study develops scanpaths as an implicit similarity measure, and uses representational similarity analysis to validate it. Observers searched for a target; fixations on distractors may reveal similarity. Similarity was also quantified by an odd-one-out task in the same participants, and ratings from different participants (Jiang et al. 2022). Representational geometries between tasks correlated. A generative model predicted first fixations in novel data. This double validation of the scanpath method opens the door to examining the causality of representations by determining if and how they vary with task demands. ### Competing Interest Statement The authors have declared no competing interest.
biorxiv.org
new preprint! 🥳 we investigated the encoding of syntax and probability in cortical activity recorded with ECoG 🧠, and, it turns out: high-frequency cortical activity represents both features - side-by-side 🙌, and in interaction 🤝. www.biorxiv.org/content/10.6... (thread to follow soon)
bioRxiv Neuroscience@biorxiv-neursci.bsky.social · 2w agoLinguistic structure and probability are jointly encoded in high gamma power https://www.biorxiv.org/content/10.64898/2026.07.21.739808v1
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Our paper "Rarely categorical, highly separable representations along the cortical hierarchy" is now out in Nature! www.nature.com/articles/s41... In this paper, we studied whether the brain is well-organized and interpretable, both globally and locally. (See thread below.)
nature.com
From a great collaboration with @lorenzoposani.com, @shuqiw.bsky.social, Samuel Muscinelli, Liam Paninski, now in Nature: www.nature.com/articles/s41...
Rarely categorical, highly separable representations along the cortical hierarchy - Nature
Cortical circuits prioritize diversity over categorical structure, supporting a computational regime geared towards high-dimensional, highly separable neural representations.
nature.com
New preprint from the lab! “A number simplex in the human medial temporal lobe” led by @hanlin-zhu.bsky.social 🧵 www.biorxiv.org/content/10.6...
A number simplex in the human medial temporal lobe
Humans handle numbers nimbly, suggesting a richer neural manifold structure than the prevalent mental number line model. In populations of medial temporal lobe (MTL) neurons in humans performing two s...
biorxiv.org
Our paper "Neural timescales from a computational perspective" is finally out in @natneuro.nature.com: www.nature.com/articles/s41... We discuss how computational models and methods can distill empirical observations on neural timescales into quantitative, testable theories of brain computation.
Neural timescales from a computational perspective - Nature Neuroscience
This review integrates computational approaches to provide a unified view on how data analysis methods, biophysical mechanistic models and machine learning approaches can help to uncover the origins a...
nature.com
Our Impact Scholars @neuromatch.bsky.social project on 𝗵𝗼𝘄 𝗿𝗲𝘄𝗮𝗿𝗱 𝘃𝘀 𝗲𝘅𝗽𝗲𝗿𝗶𝗲𝗻𝗰𝗲 𝘀𝗵𝗮𝗽𝗲 𝗻𝗲𝘂𝗿𝗮𝗹 𝗽𝗼𝗽𝘂𝗹𝗮𝘁𝗶𝗼𝗻 𝗱𝘆𝗻𝗮𝗺𝗶𝗰𝘀 𝗶𝗻 𝗺𝗼𝘂𝘀𝗲 𝘃𝗶𝘀𝘂𝗮𝗹 𝗰𝗼𝗿𝘁𝗲𝘅 is out! With 𝗝𝗼𝗵𝗻 𝗠𝗮𝗱𝗿𝗶𝗱-𝗖𝗮𝗿𝘃𝗮𝗷𝗮𝗹 @johnmadridcarvajal.bsky.social, 𝗞𝗮𝘁𝗷𝗮 𝗞𝗮𝘂𝗿𝗶𝗻𝗸𝗼𝘀𝗸𝗶, 𝗜𝘀𝗵𝗮𝘁𝗽𝗿𝗲𝗲𝘁 𝗦𝗶𝗻𝗴𝗵, 𝗥𝗼𝗵𝗶𝘁 𝗝𝗲𝘀𝘄𝗮𝗻𝘁𝗵. 🧠 👉 zenodo.org/records/2064... 🧵👇 1/8
Let’s study learning trajectories in self-supervised speech models! 🔊 Do they reflect the hierarchical organization of spoken language? We have analyzed a lot of training checkpoints to find out 🌠 Preprint: arxiv.org/abs/2604.02043 ⬇️
Most of the statistical tests you learned in stats class — t-test, ANOVA, correlation — are actually special cases of a single thing: linear regression. Ch 7 of Experimentology argues that thinking in models, not tests, is more flexible and a better foundation for theory. 🧵 experimentology.io
I don't know why Whatsapp keeps trying to stay behind @telegram for +10 years.
Week 3 of summer of papers! Here we go! 📣🎥📜 If a recurrent dynamical system is selected only for prediction, what structure does it evolve? Not just: can it predict complex timeseries (like Kuramoto-Sivashinsky)? But: what does prediction do to the machine? 1/n 🧵👇 arxiv.org/abs/2606.22765
Evolutionary Optimization Reveals Structural Constraints on Reservoir Architecture for Spatiotemporal Chaos
Biological systems maintain function in fluctuating environments by transforming past stimulation into internal dynamical states that support future-oriented responses. Reservoir computing provides a ...
arxiv.org
1/11 Happy to share our TICS paper on using the flexibility of one of the most basic cognitive functions, perception, to understand one of the most complex cognitive dysfunctions, psychiatric conditions (also my first formal work in computational psychiatry 🎉) 📄: www.cell.com/trends/cogni... 🧵 : 👇
Perceptual multistability: a multifaceted window into brain dysfunctions
Perceptual multistability, observed across species and sensory modalities, offers valuable insights into numerous cognitive functions and dysfunctions. For instance, differences in temporal dynamics a...
cell.com
Trends in Cognitive Sciences@cp-trendscognsci.bsky.social · 4mo agoOnline Now: Perceptual multistability: a multifaceted window into brain dysfunctions
Multilayer Claudetrones are the new hits!
Ketan Joshi@ketanjoshi.co · 2mo agoI don't think Anthropic really meant it this way but what an amazing demonstration of why generative AI's energy consumption is only getting worse, and dirtier. "Improvements" only come from nesting chatbots within chatbots, rather than any fundamental smarter design. It's Bitcoin x 1000
Neuropixels + Optogenetics = Neuropixels Opto Combining high-resolution electrophysiology and optogenetics. 960 sites, 28 emitters, 2 colors. Today in @natmethods.nature.com doi.org/10.1038/s415... Thanks to @wellcometrust.bsky.social, @alleninstitute.org, @hhmijanelia.bsky.social & team.
🚀 PhD position in #NeuroAI & neurodevelopment 🚀 Co-supervised by Sarah Lippé and myself, to investigate visual processing & cognition abnormalities in children with neurodevelopmental disorders in a neuroAI framework. Full project details and how to apply here: tinyurl.com/kbuyntpn 🧠🤖 📈
Some incredibly exciting news that still feels a bit surreal: I am starting my research group @mpicybernetics.bsky.social! The best part? We are hiring at all levels! Curious about the science we plan to tackle, read along :) #NeuroSky
this is such a powerful way to support the international neuroscience community, and a massively rewarding experience and great line on your CV to boot. please join us!
Neuromatch@neuromatch.bsky.social · 3mo agoWe’re looking for PhD-level researchers to volunteer as Professional Development Mentors for our July 2026 courses in #CompNeuro, #DeepLearning, #NeuroAI, and #ClimateScience. The commitment is just 3 hours total (three 1-hour sessions). Learn more and apply: neuromatch.io/mentorship/
I no longer want to/will fund a country (US) to drop their bombs on my family and friends. This is just an example!
Proton@proton.me · 4mo agoToday we're launching Proton Meet: end-to-end encrypted video calls where no one can listen in, not even Proton. Built on the same zero-access architecture as Proton Mail. Read more: https://proton.me/business/blog/introducing-proton-meet
"Starving Gaza" "Today, the prolonged food shortage in the Strip barely makes the news — after all, we have already seen worse." "The reality in Gaza undermines the future and security of us all." Lee Mordechai and Liat Kozma [The authors are at the Hebrew University of Jerusalem.]
Starvation Story — Witnessing the Gaza War
bearing-witness.com
Our new study (Debray*, Karami* et al.) explores how the brain encodes basic math concepts (integers, fractions, shapes). Samuel Debray led the 7T fMRI & behavioral work; I led the MEG. @danielavalerio.bsky.social @chrplr.bsky.social @standehaene.bsky.social www.biorxiv.org/content/10.6...
