Janis Keck
keckjanis.bsky.social
Janis Keck
@keckjanis.bsky.social
phd student in computational neuroscience, interested in geometric principles of biological & artificial learning ||
Reposted by Janis Keck
Find me and my poster at #Bernstein2026 today during Session 1. I will be talking about Infantile Amnesia and how Representational Drift might have something to do with it. The abstract can be found at: abstracts.g-node.org/conference/B...
September 29, 2026 at 9:02 AM
Getting ready for @bernsteinneuro.bsky.social, let me know if you want to catch up or grab a cofee. also, does anyone have a spare time-turner for attending multiple workshops?
September 28, 2026 at 10:39 AM
Reposted by Janis Keck
New preprint from my PhD at MPI CBS 🧠, with @doellerlab.bsky.social and @andrejbicanski.bsky.social
“A computational model of the two dentate gyrus blades”
What mechanisms allow the two DG blades to support distinct coding regimes? (www.biorxiv.org/content/10.6...)
1/9
September 7, 2026 at 2:00 PM
Reposted by Janis Keck
New preprint! www.biorxiv.org/content/10.6... Nearly a decade after starting the project, the first major results from our comparative connectomics work is online! Comparing the head direction circuits of the central complex in bees, ants and flies, recapitulating >300million years of evolution.
July 30, 2026 at 5:12 AM
Reposted by Janis Keck
New lab paper ! "Shared neural geometries for bilingual semantic representations in human hippocampal neurons" led by @xinyuanyan.bsky.social. 🧵
www.sciencedirect.com/science/arti...
Shared neural geometries for bilingual semantic representations in human hippocampal neurons
The human brain has the remarkable ability to comprehend and express similar concepts in multiple languages. To understand how it does so, we examined…
www.sciencedirect.com
June 24, 2026 at 3:54 PM
AI couldn't come up with this
June 16, 2026 at 12:12 PM
Amazing to see how far this has come in less than a year! Excited to see where this is going next
Our latest work, on modeling the human brain responses to sight, sound and language at scale:
🚨 We're very happy to introduce TRIBE v2: a foundation model of the brain's responses to sight, sound & language.

📄 Paper: ai.meta.com/research/pub...
▶️ Demo: aidemos.atmeta.com/tribev2/
💻 Code: github.com/facebookrese...
🤗 Model: huggingface.co/facebook/tri...
March 26, 2026 at 2:35 PM
Reposted by Janis Keck
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! 🧵
March 11, 2026 at 11:00 AM
Reposted by Janis Keck
1/N: Dear cognitive map fans, I’d like to share a model I’ve been working on for a while (clearing backlog :). I show how a vector navigation architecture (VNA) and a “positional inference network” (PIN) can build Universal Cognitive Maps (UCMs) for abstract spaces.

www.biorxiv.org/content/10.6...
www.biorxiv.org
March 9, 2026 at 3:26 PM
Reposted by Janis Keck
Can whole-brain fMRI responses to naturalistic video stimuli be predicted using only transcripts?

Last year, I gave a tutorial on exactly that. Since the response was very positive, I’ve now released both the tutorial notebook and the trained models publicly.
March 9, 2026 at 3:44 PM
Reposted by Janis Keck
I am totally pumped about this new work . "Task-trained RNNs" are a powerful and influential framework in neuroscience, but have lacked a firm theoretical footing. This work provides one, and makes direct contact with the classical theory of random RNNs:
www.biorxiv.org/content/10.6...
March 4, 2026 at 5:12 PM
Reposted by Janis Keck
“Humans across multiple languages spontaneously associate the nonwords kiki & bouba with spiky & round shapes, respectively...We tested the bouba-kiki effect in baby chickens. Similar to humans, they spontaneously chose a spiky shape when hearing a kiki sound & a round shape when hearing a bouba.”😲🧪
Matching sounds to shapes: Evidence of the bouba-kiki effect in naïve baby chicks
Humans across multiple languages spontaneously associate the nonwords “kiki” and “bouba” with spiky and round shapes, respectively, a phenomenon named the bouba-kiki effect. To explore the origin of t...
www.science.org
February 19, 2026 at 7:20 PM
Reposted by Janis Keck
The hippocampal map has its own attentional control signal!
Our new study reveals that theta #sweeps can be instantly biased towards behaviourally relevant locations. See 📹 in post 4/6 and preprint here 👉
www.biorxiv.org/content/10.6...
🧵(1/6)
Attention-like regulation of theta sweeps in the brain's spatial navigation circuit
Spatial attention supports navigation by prioritizing information from selected locations. A candidate neural mechanism is provided by theta-paced sweeps in grid- and place-cell population activity, which sample nearby space in a left-right-alternating pattern coordinated by parasubicular direction signals. During exploration, this alternation promotes uniform spatial coverage, but whether sweeps can be flexibly tuned to locations of particular interest remains unclear. Using large-scale Neuropixels recordings in freely-behaving rats, we show that sweeps and direction signals are rapidly and dynamically modulated: they track moving targets during pursuit, precede orienting responses during immobility, and reverse during backward locomotion — without prior spatial learning. Similar modulation occurs during REM sleep. Canonical head-direction signals remain head-aligned. These findings identify sweeps as a flexible, attention-like mechanism for selectively sampling allocentric cognitive maps. ### Competing Interest Statement The authors have declared no competing interest. European Research Council, Synergy Grant 951319 (EIM) The Research Council of Norway, Centre of Neural Computation 223262 (EIM, MBM), Centre for Algorithms in the Cortex 332640 (EIM, MBM), National Infrastructure grant (NORBRAIN, 295721 and 350201) The Kavli Foundation, https://ror.org/00kztt736 Ministry of Science and Education, Norway (EIM, MBM) Faculty of Medicine and Health Sciences; NTNU, Norway (AZV)
www.biorxiv.org
January 28, 2026 at 10:03 AM
Reposted by Janis Keck
Introducing DroPE: Extending Context by Dropping Positional Embeddings

We found embeddings like RoPE aid training but bottleneck long-sequence generalization. Our solution’s simple: treat them as a temporary training scaffold, not a permanent necessity.

arxiv.org/abs/2512.12167
pub.sakana.ai/DroPE
January 12, 2026 at 4:07 AM
Reposted by Janis Keck
Our paper on data constrained RNN that generalize to optogenetic perturbations now citable on eLife:
doi.org/10.7554/eLif...
December 18, 2025 at 11:07 PM
New preprint! Have you ever wondered, what are these fuzzy simplicial sets, the theoretical framework behind e.g. UMAP? Here we show that you may simply see them as marginal distributions over simplicial sets. This provides a generative model for UMAP. (1/2)

arxiv.org/abs/2512.03899
Probabilistic Foundations of Fuzzy Simplicial Sets for Nonlinear Dimensionality Reduction
Fuzzy simplicial sets have become an object of interest in dimensionality reduction and manifold learning, most prominently through their role in UMAP. However, their definition through tools from alg...
arxiv.org
December 4, 2025 at 12:31 PM
Reposted by Janis Keck
Three German universities offering post-docs for researchers "who cannot conduct or continue their work in the USA appropriately because of actual political pressure. "
www.uni-konstanz.de/zukunftskoll...
Early Career Rescue Fellowship
www.uni-konstanz.de
November 11, 2025 at 7:10 PM
Reposted by Janis Keck
Foraging in conceptual spaces: hippocampal oscillatory dynamics underlying searching for concepts in memory

www.biorxiv.org/content/10.1...
Foraging in conceptual spaces: hippocampal oscillatory dynamics underlying searching for concepts in memory
How does the brain access stored knowledge? It has been proposed that conceptual search engages neurocognitive processes similar to foraging in physical space. We tested this idea using intracranial E...
www.biorxiv.org
October 13, 2025 at 7:57 PM
Reposted by Janis Keck
New preprint from the lab and great work by Fei Wang. We show how subiculum trace vector cells can be modeled consistent with known effects in CA1. Traces are driven by a mismatch learning rule to keep associative memories in line with experience.
www.biorxiv.org/content/10.1...
Dynamic updating of cognitive maps via traces of experience in the subiculum
In the classical view of hippocampal function, the subiculum is assigned the role as the output layer. In spatial paradigms, some subiculum neurons manifest as so-called boundary vector cells (BVCs), ...
www.biorxiv.org
October 3, 2025 at 7:01 AM
Reposted by Janis Keck
Super proud of this collaboration with rockstar Ryan Raut - born out of playing in the sandbox in our last year of grad school! Multi-scale brain activity can be predicted from a simple measure of arousal like pupil diameter. Out with linear causality, in with dynamic systems to explain neurobiology
Arousal as a universal embedding for spatiotemporal brain dynamics - Nature
Reframing of arousal as a latent dynamical system can reconstruct multidimensional measurements of large-scale spatiotemporal brain dynamics on the timescale of seconds in mice.
www.nature.com
September 24, 2025 at 9:52 PM
Reposted by Janis Keck
1/
🚨 New preprint! 🚨

Excited and proud (& a little nervous 😅) to share our latest work on the importance of #theta-timescale spiking during #locomotion in #learning. If you care about how organisms learn, buckle up. 🧵👇

📄 www.biorxiv.org/content/10.1...
💻 code + data 🔗 below 🤩

#neuroskyence
September 17, 2025 at 7:33 PM
Reposted by Janis Keck
Can a single cell learn? Even without a brain, some microbes show simple forms of cognition. Can this basal cognition be engineered? Check our new paper with @jordiplam.bsky.social on the minimal synthetic circuits & their cognitive limits. @drmichaellevin.bsky.social www.biorxiv.org/content/10.1...
September 10, 2025 at 11:48 AM
Andrej is a great scientist and teacher, highly recommended!
Dear colleagues, we have an open PhD position in computational neuroscience - spatial memory models and intracranial recordings - fully funded. Re-advertised, candidates are ideally available in the near future. A collab. with 4 labs. Apply here: tinyurl.com/yc84ctap
PhD position or a Doctoral Candidate in computational neuroscience. (m/f/d) | Karriereportal Max-Planck-Institut für Kognitions- und Neurowissenschaften
PhD position or a Doctoral Candidate in computational neuroscience. (m/f/d) | Karriereportal Max-Planck-Institut für Kognitions- und Neurowissenschaften
tinyurl.com
September 8, 2025 at 1:28 PM
Reposted by Janis Keck
Congratulations to
@reznikdan.bsky.social
and
@sofievalk.bsky.social
for this tremendous achievement!
September 5, 2025 at 2:59 PM
Reposted by Janis Keck
In sum, we believe this is the first direct evidence in humans of systems consolidation theory for specific memories: the hypothesized transformation of memories from hippocampus to cortex over sleep.

Take look for yourself on @biorxivpreprint.bsky.social t.co/xFEDpqVXfE 6/6
https://www.biorxiv.org/content/10.1101/2025.07.01.662486v3
t.co
August 28, 2025 at 7:39 PM