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Samuel Eckmann

@samueleckmann.bsky.social
768 followers 353 following 90 posts

Computational neuroscientist, currently at the Sainsbury Wellcome Centre/Gatsby Unit in London. Interested in neural circuits, E-I balance, and biological learning → samueleckmann.github.io

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Reposted by Samuel Eckmann
neurosock @neurosock.bsky.social · 01/10/2026
Mix. selectivity is everywhere in cortex: from vis. to PFC This paper relates to Cover's theorem but the typical explainer kind of sucks I'll try to explain how the theory relates to the paper, and the importance of "weird" neurons A🧵with my toy model and notes: #neuroskyence #compneuro #NeuroAI
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Samuel Eckmann @samueleckmann.bsky.social · 09/09/2026
How do you 'learn' intuition? Or worse, how do you 'teach' intuition?
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Samuel Eckmann @samueleckmann.bsky.social · 09/09/2026
"The first rule of the Intuition Club is: you don’t talk about the Intuition Club. The second rule is, if you really want to talk about intuition, make it sound casual and accessory, because we ain’t the psychology department."
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Samuel Eckmann @samueleckmann.bsky.social · 08/09/2026
This is wild! cims.nyu.edu/~tristanb/st...
cims.nyu.edu
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Reposted by Samuel Eckmann
SE Gyges @segyges.bsky.social · 08/09/2026
to tldr the drama for humans if nobody has: someone, who is a good mathematician working with other mathematicians and using LLMs, appears to have mostly solved Navier-Stokes. he then got forced to go public early because openai thought they could scoop him and threaten his career he has tenure.
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Mark Wagner @mark-j-wagner.bsky.social · 26/08/2026
How the cerebellum separates related contexts—now out in Nature! Martha Garcia-Garcia led this tour de force, with theory from @somnirons.bsky.social & Michał Wójcik. Martha is on the faculty market, and I could not recommend her more highly. My lab is also recruiting! www.nature.com/articles/s41...
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Yasmine El-Shamayleh @elshamayleh.bsky.social · 26/08/2026
Excited to share the lab’s first publication, co-led by talented postdoc Chuyi Su @chuyisu.bsky.social We leveraged cell type-specific optogenetics in the macaque cerebral cortex to elucidate the role of excitatory and inhibitory neurons in visual form processing. www.nature.com/articles/s41...
nature.com
Optotagging in primate cortex uncovers excitatory and inhibitory neuron specializations in form vision - Nature Communications
This study leverages cell type-specific optogenetics in the monkey cerebral cortex to elucidate the unique functional contributions of excitatory and inhibitory neurons in visual form processing. The ...
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Reposted by Samuel Eckmann
Dan Larremore @danlarremore.bsky.social · 25/08/2026
🎉 New paper (and data) on editorial & peer review at Science and Science Advances, two elite general science journals. With a wonderful team! @samzhang.bsky.social, @nicklaberge.bsky.social, Quinten and @aaronclauset.bsky.social. 1/ www.science.org/doi/full/10....
Screenshot of the title page: 

Elite general science journals shape scientific discourse, public policy, and scientific careers. However, expectations of confidentiality in most editorial proceedings has limited efforts to understand and improve the review process. Here, we describe and release deidentified data on 110,303 manuscript submissions over 5 years at Science and Science Advances, two elite general science journals. Analyzing evaluation dynamics across the initial editorial review and subsequent peer review stages, we find strong selective effects associated with higher institutional prestige, larger team size, and certain topics and countries. Corresponding authors who are men exhibit a small but significant advantage at Science, while authors based in China have a significant disadvantage. These associations are generally stronger in editorial review than in peer review, even as final editorial decisions correlate strongly with reviewer advice. These patterns highlight the complexity of multistage evaluations at elite journals and the importance of open data to better understand them.
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Reposted by Samuel Eckmann
Ken Miller @kenmiller.bsky.social · 26/08/2026
This is wild. >1/2 of HC synapses disappear in artificial hibernation, come back in same/similar locations & memories intact. ~1/2 of engram synapses-between two memory-tagged cells-are clustered on dendrites, those preferentially spared. Not biggest synapses. 1/ www.science.org/doi/10.1126/...
This shows the visual abstract and a paragraph from the extended abstract of the linked article.
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Reposted by Samuel Eckmann
Matteo Carandini @carandinilab.net · 31/07/2026
The apical dendrite looks great, and does wonders in a slice. What does it do in the living cortex? It depends on the cell. A causal spatial role for apical dendrites in the cortex www.biorxiv.org/content/10.6... by @anyiliu.bsky.social with @kenneth-harris.bsky.social and @fedrossi.bsky.social
A cartoon providing a graphical summary of the paper. It is divided in 3 rows.

The top row shows a pyramidal cell and its apical tuft, and shows the two experiments that we ran: optical dendritic pruning (chopping off the apical tuft), and synaptic imaging done in the same neurons where we do somatic imaging. 

The middle row shows the results pertaining to neurons that prefer large stimuli (this is visual cortex): pruning reduced their responses, and the receptive fields of apical synapses are far away from the that of the soma. 

The bottom row shows the results pertaining to neurons that prefer small stimuli: pruning seemed to do nothing to the responses, and the receptive field of apical synapses are right around that of the soma.
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Reposted by Samuel Eckmann
Anthony Ramnauth @philoneurosci.bsky.social · 21/07/2026
Parallel independent #voltage #computing along #dendrites of #CA3 pyramidal #neurons | Science www.science.org/doi/10.1126/...
science.org
Parallel independent voltage computing along dendrites of CA3 pyramidal neurons
Dendritic computation contributes to information processing in cortical circuits. Hippocampal CA3 plays a central role in navigation, but how the dendrites of CA3 pyramidal neurons process information...
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Reposted by Samuel Eckmann
Martin Wiener @martinwiener.bsky.social · 20/07/2026
Alpha rhythm determines speech perception rate? And speeding it up makes unintelligibly fast speech comprehensible? This is nuts! www.pnas.org/doi/abs/10.1...
pnas.org
PNAS
Proceedings of the National Academy of Sciences (PNAS), a peer reviewed journal of the National Academy of Sciences (NAS) - an authoritative source of high-impact, original research that broadly spans...
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Kevin Mitchell @wiringthebrain.bsky.social · 17/07/2026
Ethological learning (hunting prey) during the critical period resets synaptic setpoints in mouse binocular visual cortex www.cell.com/neuron/fullt... - really interesting paper from @turrigiano.bsky.social and colleagues!
cell.com
Ethological learning during the critical period resets synaptic setpoints in mouse binocular visual cortex
Bissen et al. show that prey capture learning profoundly reshapes visual cortical circuitry and function during developmental critical periods, but not in adulthood. These learning-induced structural ...
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Jake Watson @jakefwatson.bsky.social · 11/07/2026
We have a new preprint! By studying neuronal heterogeneity in CA3, we found a weird but powerful new feature in the hippocampal circuitry! 🧠 #neuroskyence 🧵.. Morse-Mora et al. | Hippocampal CA3 forms a two-layer network of molecularly distinct cell types in mice and humans doi.org/10.64898/202...
Mouse hippocampal slice with deep cells labelled blue, patch-clamp recorded cells in yellow, and deep CA3 projections labelled purple
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Tristan Geiller @tristan-geiller.bsky.social · 08/07/2026
Happy to share our latest work, out today! We show that spatial representations and their dynamics differ across anatomical compartments of hippocampal CA3, and that these differences can be explained by the level of recurrent connectivity in each compartment www.sciencedirect.com/science/arti...
sciencedirect.com
Recurrent connectivity shapes spatial coding in hippocampal CA3 subregions
Stable and flexible neural representations of space in the hippocampus are crucial for navigating complex environments, yet how they emerge from the u…
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AntonioFR @antferrui.bsky.social · 06/07/2026
Our work on goal-directed theta sweeps is out! We found two different types of theta sweeps in the rat hippocampus. During random foraging, left-right alternating sweeps dominated (Vollan, 25). However, during memory-guided navigation sweeps pointing to hidden goal locations emerged with learning.
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International Society for Neuroethology @neuroethology.org · 28/05/2026
New paper from Ulanovsky's group: With brain recordings from🦇 flying in a 200m tunnel, the group discovered that place cells of CA1 exhibit dense spatial coding, i.e., multiple place fields, and cells of CA3 exhibit ultrasparse coding, i.e., one place field. www.nature.com/articles/s41...
nature.com
Sparse-to-dense coding transformation between hippocampal areas CA3 and CA1 - Nature
The hippocampus exhibits a CA3-to-CA1 coding transformation that combines fast learning with an efficient, compressed neural code.
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Kenneth Harris @kenneth-harris.bsky.social · 26/05/2026
10. As AI improves, it will automate more of what we used to do manually. We may see two publication ecosystems: one written by Agents for Agents, and one written for humans. Humans’ role may shift to choosing the questions, judging the evidence, and deciding what matters.
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Andrew Pruszynski @andpru.bsky.social · 22/05/2026
I love this work, check out Lucas' talk on the study as part of the superlab journal club... youtu.be/hCuUE7XEg8o?...
youtu.be
Lucas Tian (Rockefellar)
YouTube video by Andrew Pruszynski
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Blake Richards @tyrellturing.bsky.social · 08/05/2026
I don't think our culture is ready for accepting this idea, and probably some percentage of humans never will be. My guess: hundreds of years from now a majority will agree with this, but many still won't, and it will correlate with religion and education. (See, e.g., Darwinian evolution) 🧠📈 🧪
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Mehrdad Kashefi @mkashefi.bsky.social · 14/05/2026
Seems like seaborn really hates jet colormap!
In seaborn source code, using jet colormap raises an error which says: No with commented text # paternalism.
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Zejin Lu @zejinlu.bsky.social · 11/05/2026
Now out in Nature Machine Intelligence @NatMachIntell “Adopting a human developmental visual diet yields robust and shape-based AI vision”: doi.org/10.1038/s422.... A wonderful case where brain inspiration improved AI. With @martisamuser.bsky.social, Radek Cichy and @timkietzmann.bsky.social .
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Eduardo Maristany de las Casas @maristanye.bsky.social · 08/05/2026
1/10 When the going gets tough, the dendrites get going. Here is a summary on our new paper just published in @science.org on flexible learning in frontal motor cortex. With @mattlark.bsky.social 🔬. #neuroskyence #neuroscience 🔗 doi.org/10.1126/scie...
doi.org
Tuft dendrites in frontal motor cortex enable flexible learning
Flexible learning relies on integrating sensory and contextual information to adjust behavioral output in different environments. The anterolateral motor cortex (ALM) is a frontal area critical for ac...
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David G. Clark @david-g-clark.bsky.social · 06/05/2026
Now in PRE: "Transient dynamics of associative memory models." I argue that the "blackout catastrophe" is not catastrophic when viewed from an out-of-equilibrium, dynamical perspective. Journal: journals.aps.org/pre/abstract/10.1103/42y2-bsh1 PDF: dclark.io/media/clark-...
journals.aps.org
Transient dynamics of associative memory models
Associative memory models such as the Hopfield network and its dense generalizations with higher-order interactions exhibit a ``blackout catastrophe''---a discontinuous transition where stable memory ...
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Caswell Barry @caswell.bsky.social · 27/04/2026
Nicely contrary to how I'd thought this worked: disrupting theta-timescale spiking impairs learning but leaves hippocampal replay intact. Suggests replay doesn't need clean theta sequences during behaviour to form. doi.org/10.1101/2025.09.15.675587
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Cameron Blevins @cblevins.bsky.social · 03/04/2026
This is so, so well-articulated.
People call this friction "grunt work." Schwartz uses exactly that phrase, and he's right that LLMs can remove it. What he doesn't say, because he already has decades of hard-won intuition and doesn't need the grunt work anymore, is that for someone who doesn't yet have that intuition, the grunt work is the work. The boring parts and the important parts are tangled together in a way that you can't separate in advance. You don't know which afternoon of debugging was the one that taught you something fundamental about your data until three years later, when you're working on a completely different problem and the insight surfaces. Serendipity doesn't come from efficiency. It comes from spending time in the space where the problem lives, getting your hands dirty, making mistakes that nobody asked you to make and learning things nobody assigned you to learn.
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Blake Richards @tyrellturing.bsky.social · 02/04/2026
This paper looks interesting, I look forward to reading it: www.cell.com/neuron/fullt... But, my guess is that there's an interpretation based on *prediction*, rather than "context modulation", that would be more theoretically relevant. #neuroscience 🧪
cell.com
Feature-tuned synaptic inputs to somatostatin interneurons drive context-dependent processing
Combining intracellular and extracellular recordings, calcium imaging, and holographic circuit mapping, Hendricks et al. identify a feature-specific pyramidal cell-to-somatostatin interneuron microcir...
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Ben Long @botbml.bsky.social · 23/03/2026
The impact of bioRxiv in numbers @richardsever.bsky.social
Image of News in focus article from Nature entitled "How bioRxiv changed the way biologists share ideas - in numbers"
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Dimitra Maoutsa @dimma.bsky.social · 15/03/2026
I am looking for a theory/computational POSTDOC position in EU or east coast US. I am interested in how learning and plasticity shape population dynamics & representational geometries & how these changes are reflected in behavior. If you are at #COSYNE2026 & interested, hit me up in Whova, not here
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Matteo Guardamagna @matteoguardamagna.bsky.social · 11/03/2026
1/7 🧠 My journey into development begins with this work and question: how does the brain's spatial navigation system develop? We found that the neural networks for spatial navigation (tori and rings) are preconfigured and only later anchor gradually to the world with experience! 🧵
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tbiba.bsky.social @tbiba.bsky.social · 02/03/2026
I am excited to share my first paper, showing that episodic memory formation is theta rhythmic, is now published in Nature Human Behavior! Check it out here: rdcu.be/e6pzS. Thanks to my PI, Katherine Duncan, and to my collaborators for their support on this journey! Stay tuned for iEEG follow up 🧠
rdcu.be
Episodic memory encoding fluctuates at a theta rhythm of 3–10 Hz
Nature Human Behaviour - Biba et al. show that episodic memory encoding fluctuates at a theta rhythm of 3–10 Hz.
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The Transmitter @thetransmitter.bsky.social · 27/02/2026
Dendritic arbors provide neuroscience with an ideal opportunity to study how individual neurons interact with their broader circuitry and are the field’s best bet to bridge cellular and systems neuroscience, writes @justinkohare.bsky.social. #neuroskyence www.thetransmitter.org/dendrites/de...
thetransmitter.org
Dendrites help neuroscientists see the forest for the trees
Dendritic arbors provide just the right scale to study how individual neurons reciprocally interact with their broader circuitry—and are our best bet to bridge cellular and systems neuroscience.
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Benjamin Cowley @benjocowley.bsky.social · 26/02/2026
DNN models of the brain are getting bigger. Are we replacing one complicated system in vivo with another in silico? In new work, we seek the *smallest* DNN models of visual cortex, balancing prediction with parsimony. It turns out these compact models are surprisingly small! rdcu.be/e5H8G
rdcu.be
Compact deep neural network models of the visual cortex
Nature - Parsimonious deep neural network models can be used for prediction of visual neuron responses.
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torsteinslettmoen.bsky.social @torsteinslettmoen.bsky.social · 20/02/2026
1/6 Do neighboring #PlaceCells in #Hippocampus CA1 map neighboring locations in space? 🧠🗺️ Is there micro-scale spatial topography in the hippocampus? See our latest paper from @kavlintnu now out in @pnas.org www.pnas.org/doi/10.1073/...
pnas.org
Place cells in CA1 lack topographical organization of firing locations | PNAS
Topography is a well-described and well-known concept for cortical organization in primary sensory and motor cortices of mammalian brains. Similar ...
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bioRxiv Neuroscience @biorxiv-neursci.bsky.social · 21/02/2026
Temporal Coding rather than Circuit Wiring allows Hippocampal CA3 Neurons to Dynamically Distinguish Different Cortical Inputs www.biorxiv.org/content/10.64898/20…
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Edvard I Moser @edvardmoser.bsky.social · 19/02/2026
A half-century old question may have its final answer. Using high-resolution #Mini2P microscopes, we find no evidence of local topography in #PlaceCells. Place fields of neighbouring cells are no more similar than those of randomly selected cells. 🧠🗺️ Out now in @pnas.org www.pnas.org/doi/10.1073/...
pnas.org
Place cells in CA1 lack topographical organization of firing locations | PNAS
Topography is a well-described and well-known concept for cortical organization in primary sensory and motor cortices of mammalian brains. Similar ...
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Jess Cardin @jess-cardin.bsky.social · 17/02/2026
New preprint from the lab! Stefan Sun and @q-perrenoud.bsky.social collaborated to look at how sensory experience affects the adult cortex. Using ephys and 2-photon imaging, they found that varied visual experience reorganizes dendrite-targeting inhibitory circuits in V1.
biorxiv.org
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Serge Ahmed @sergeahmed.bsky.social · 17/02/2026
Pavlov would have been shocked and stoked by this study! It meticulously shows that what matters most for cue-reward learning is the duration between rewards: the longer this duration, the fewer the number of trials needed for behavioral and DA learning www.nature.com/articles/s41...
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Samuel Eckmann @samueleckmann.bsky.social · 16/02/2026
Motor sequence generation _without_ cortico-thalamic loops!
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Kate Storrs @katestorrs.bsky.social · 09/02/2026
Our latest paper, “Visual language models show widespread visual deficits on neuropsychological tests”, is now out in Nature Machine Intelligence: www.nature.com/articles/s42... Non-paywalled version: arxiv.org/abs/2504.10786 Tweet thread below from first author @genetang.bsky.social...
nature.com
Visual language models show widespread visual deficits on neuropsychological tests - Nature Machine Intelligence
Tangtartharakul and Storrs use standardized neuropsychological tests to compare human visual abilities with those of visual language models (VLMs). They report that while VLMs excel in high-level obje...
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Sergi Roig Puiggros @sroig.bsky.social · 07/01/2026
I'm very excited to finally see this one out in @natneuro.nature.com ! It has been an incredible journey alongside extremely talented people! Thanks to everyone involved and enjoy the reading! 1/n www.nature.com/articles/s41...
nature.com
Position-independent emergence of neocortical neuron molecular identity, connectivity and function - Nature Neuroscience
Even when neocortical neurons form in abnormal locations, they retain their identity and function, revealing that brain circuit formation can be guided by intrinsic developmental programs rather than ...
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Abraham Zelalem Vollan @azvollan.bsky.social · 28/01/2026
We had a lot of fun doing these experiments! Theta sweeps in MEC and internal direction signals in parasubiculum track moving objects during pursuit and reverse during backward movement. Simultaneously recorded HD cells in other areas remain locked to head direction across behaviors:
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dickretired @dickretired.bsky.social · 24/01/2026
I agree so long as the computational models make predictions that other models do not, and those predictions are then tested.
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Neuroskeptic @neuroskeptic.bsky.social · 25/01/2026
"How much of the brain's learned algorithms depend on the fact it is a brain?" arxiv.org/abs/2601.02063 The brain is a neural network, but also a biological organ (unlike artificial neural networks). How much does this matter to cognition?
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adamezracohen.bsky.social @adamezracohen.bsky.social · 21/01/2026
What's the relation between voltage and calcium in dendrites? Xiang Wu studied this in CA2 hippocampal pyramidal cells in behaving mice. www.biorxiv.org/content/10.6...
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Renato Duarte @rcfduarte.bsky.social · 16/01/2026
New Journal Club explores TARPs as multi-domain regulators that couple synaptic strength to intrinsic excitability—providing a molecular substrate for coordinated adaptation across timescales. open.substack.com/pub/grounded...
open.substack.com
Beyond Trafficking: Auxiliary Proteins as Multi-Domain Regulators of Neuronal Computation
Auxiliary proteins aren’t just molecular bystanders and supporters, they’re computationally active and play an integral role in intracellular communication.
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Samuel Eckmann @samueleckmann.bsky.social · 15/01/2026
"motor cortical engagement is sustained under conditions of sensorimotor uncertainty and dissipates rapidly when sensorimotor contingencies are resolved"
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Cian O'Donnell @cianodonnell.bsky.social · 12/01/2026
when doing neuroscience projects I often advocate for computational modelling, followed by data analysis to test model's predictions. however a few times now I have had pushback from collaborators/reivewers suggesting it would be better to do the data analysis first, then the modelling. thoughts?
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Samuel Eckmann @samueleckmann.bsky.social · 13/01/2026
"In contrast to reactivation of rodent place cells, reactivation of human concept cells does not reflect sequences of events in human experience."
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