Jonathan Tsay
banner
tsay.bsky.social
Jonathan Tsay
@tsay.bsky.social
Assistant Professor of Psychology at Carnegie Mellon University | Studying how we acquire, adapt, and retain skilled movements | Physical Intelligence Lab: www.tsaylab.com
Pinned
The cerebellum isn’t just about coordinating movement. It’s implicated in nearly every domain of cognition—from language to social behavior.

But how exactly does the cerebellum contribute to action and cognition? 🧵

Check out our new paper w/ Rich Ivry.
arxiv.org/abs/2509.09818
Cerebellar Contributions to Action and Cognition: Prediction, Timescale, and Continuity
The cerebellum is implicated in nearly every domain of human cognition, yet our understanding of how this subcortical structure contributes to cognition remains elusive. Efforts on this front have ten...
arxiv.org
Reposted by Jonathan Tsay
Next week, I'll be presenting my work with @annecollins.bsky.social @collinsccnlab.bsky.social on reward function compression in human RL at @sfn.org. Join me at the "Adaptive Choice" nanosymposium on Nov 16th or dm me if you'd like to meet up!
November 11, 2025 at 12:36 AM
Reposted by Jonathan Tsay
Our new preprint on the FOODEEG open dataset is out! EEG recordings and behavioural responses on food cognition tasks for 117 participants will be made publicly available 🧠 @danfeuerriegel.bsky.social @tgro.bsky.social

www.biorxiv.org/content/10.1...
FOODEEG: An open dataset of human electroencephalographic and behavioural responses to food images
Investigating the neurocognitive mechanisms underlying food choices has the potential to advance our understanding of eating behaviour and inform health-targeted interventions and policy. Large, publi...
www.biorxiv.org
November 10, 2025 at 11:34 PM
Reposted by Jonathan Tsay
Neural manifolds that orchestrate walking and stopping https://www.biorxiv.org/content/10.1101/2025.11.08.687367v1
November 9, 2025 at 10:16 AM
Reposted by Jonathan Tsay
A tad late (announcements coming) but very happy to share the latest developments in my previous preprint!

Previously, we show that neural representations for control of movement are largely distinct following supervised or reinforcement learning. The latter most closely matches NHP recordings.
November 6, 2025 at 2:10 AM
Reposted by Jonathan Tsay
✨ Exciting News! ✨

I am thrilled to share that I will be joining the University of Guelph's Department of Psychology in Neuroscience and Applied Cognitive Science as an Assistant Professor, starting July 1, 2026. I will be returning to Canada on Canada Day!
November 7, 2025 at 12:57 PM
Reposted by Jonathan Tsay
🚨Job alert🚨

The lab has up to *3 postdoc openings* for comp systems neuroscientists interested in describing and manipulating neural population dynamics mediating behaviour

This is part of a collaborative ARIA grant "4D precision control of cortical dynamics"

euraxess.ec.europa.eu/jobs/383909
3 Postdoctoral Research Fellows
Champalimaud Foundation (Fundação D. Anna de Sommer Champalimaud e Dr.
euraxess.ec.europa.eu
November 4, 2025 at 5:11 PM
Reposted by Jonathan Tsay
Birds are both intelligent and incredibly agile, yet they are quite small. How do they achieve this with their little brains?
They have twice as many neurons per brain mass than mammals, including primates.
www.pnas.org/doi/abs/10.1...
November 7, 2025 at 12:55 PM
Reposted by Jonathan Tsay
YES! "to explain all human cognition, we inherently must include development".
Beyond the Adult Mind: A Developmental Framework for Predictive Processing in Infancy - Ward - Topics in Cognitive Science - Wiley Online Library onlinelibrary.wiley.com/doi/full/10....
Beyond the Adult Mind: A Developmental Framework for Predictive Processing in Infancy
In this paper, we argue that Predictive Processing cannot be a unifying account of cognition until it can explain infant development. We show why development is crucial for understanding human cognit...
onlinelibrary.wiley.com
November 2, 2025 at 11:54 AM
Reposted by Jonathan Tsay
1/5: Interested in basketball? Disease ecology? Epidemics?

5 years ago, the NBA embarked on a great experiment in infection control: "The NBA Bubble." In a new preprint led by Dr. Yun Tao + Dr. Nita Bharti, we examine it's underlying disease ecology principles.

www.medrxiv.org/content/10.1...
Pandemic-era sports league operations as a new paradigm for local epidemic resilience
Strategic, coordinated, and rapid responses are essential when pathogens emerge, yet these responses are often mishandled during epidemics due to myriad factors, including entrenched socioeconomic and...
www.medrxiv.org
October 31, 2025 at 11:56 AM
Reposted by Jonathan Tsay
I'm recruiting PhD students for my lab at Northwestern! I'm reviewing applications for the Department of Psychology for the Cognitive Affective Neuroscience and Clinical areas, due 12/1. 🧠

Come join the CATS Lab: nucatslab.com

Learn about our latest research: iamh.northwestern.edu/research/res...
CATS Lab
Child & Adolescent Translational Science Lab at Northwestern University
nucatslab.com
October 29, 2025 at 6:39 PM
Reposted by Jonathan Tsay
1/🧵 Out today in @frontiersin.bsky.social : “Consciousness science: where are we, where are we going, and what if we get there?” By @axc.bsky.social @liadmudrik.bsky.social, & me (a CIFAR & @erc.europa.eu production 🧠). www.frontiersin.org/journals/sci...
Advancing consciousness science
Defining new directions in consciousness research and exploring implications for medicine, technology, and ethics
www.frontiersin.org
October 30, 2025 at 12:00 PM
Reposted by Jonathan Tsay
I am recruiting a postdoc at UC Santa Barbara for an NIH-funded project on the organization of lateral PFC function--across emotion and cognition--using representational fMRI & TMS. I’d love to find someone w/ a background in cognitive control & computational modeling to complement our team! 🏝️ 🧠 🧲
October 29, 2025 at 6:20 PM
Reposted by Jonathan Tsay
Super happy to see this review out! We ask why people are so reluctant to abandon goals and how this commitment could be understood computationally. Work with Jill O'Reilly & @yaelniv.bsky.social
October 29, 2025 at 3:56 PM
Reposted by Jonathan Tsay
Stoked to see our study out in final form! Big kudos to @jonathanamichaels.bsky.social for driving this along for the past 5 years.
October 29, 2025 at 4:47 PM
Reposted by Jonathan Tsay
thrilled!! but speaking after @monicarosenb.bsky.social ??? that's too tough to follow
October 29, 2025 at 2:59 PM
Reposted by Jonathan Tsay
My co-authors have yet to move to Bluesky, so I'm pleased to announce our latest work has just been published in @nature.com Neuroscience. Amazing work led by Junheng Li, revealing that falling asleep follows a predictable bifurcation pattern #neuroskyence #sleep
www.nature.com/articles/s41...
Falling asleep follows a predictable bifurcation dynamic - Nature Neuroscience
Li et al. propose a conceptual framework to study the phenomenon of falling asleep based on electroencephalogram data. They show that a tipping point marks the brain’s nonlinear wake-to-sleep transiti...
www.nature.com
October 28, 2025 at 5:35 PM
Reposted by Jonathan Tsay
🚨Preprint: Semantic Tuning of Single Neurons in the Human Medial Temporal Lobe

1/8: How do human neurons encode meaning?
In this work, led by Katharina Karkowski, we recorded hundreds of human MTL neurons to study semantic coding in the human brain:

doi.org/10.1101/2025...
Semantic Tuning of Single Neurons in the Human Medial Temporal Lobe
The Medial Temporal Lobe (MTL) is key to human cognition, supporting memory, emotional processing, navigation, and semantic coding. Rare direct human MTL recordings revealed concept cells, which were ...
doi.org
October 27, 2025 at 3:32 PM
Reposted by Jonathan Tsay
Evidence for graded semantic tuning curves in human concept cells.
Lovely work with Katharina Karkowski, Florian Mormann, Yair Lakretz, Marcel Kehl et al.
🚨Preprint: Semantic Tuning of Single Neurons in the Human Medial Temporal Lobe

1/8: How do human neurons encode meaning?
In this work, led by Katharina Karkowski, we recorded hundreds of human MTL neurons to study semantic coding in the human brain:

doi.org/10.1101/2025...
Semantic Tuning of Single Neurons in the Human Medial Temporal Lobe
The Medial Temporal Lobe (MTL) is key to human cognition, supporting memory, emotional processing, navigation, and semantic coding. Rare direct human MTL recordings revealed concept cells, which were ...
doi.org
October 28, 2025 at 8:48 AM
Reposted by Jonathan Tsay
Excited that this work discovering cross-species signatures of stabilizing foot placement control is now out in PNAS!

pnas.org/doi/10.1073/...

@antoinecomite.bsky.social
October 21, 2025 at 9:39 PM
Reposted by Jonathan Tsay
Revisiting the explicit-implicit additivity assumption in visuomotor adaptation https://www.biorxiv.org/content/10.1101/2025.10.20.683435v1
October 21, 2025 at 4:15 PM
Reposted by Jonathan Tsay
The sense of ownership and agency stem from proprioception, the sensory root of self-awareness. In a group of 46 right-brain-damaged patients, the disruption of a bilateral parietal network underlies proprioceptive deficits leading to ownership disorders and anosognosia for hemiplegia.
Proprioception as a sensory root for body and motor awareness
Salvato et al. report that proprioceptive deficits predict both disturbed sensation of ownership and anosognosia for hemiplegia following right-hemisphere
doi.org
October 24, 2025 at 7:57 AM
Reposted by Jonathan Tsay
🧠 Regularization, Action, and Attractors in the Dynamical “Bayesian” Brain

direct.mit.edu/jocn/article...

(still uncorrected proofs, but they should post the corrected one soon--also OA is forthcoming, for now PDF at brainandexperience.org/pdf/10.1162-...)
Regularization, Action, and Attractors in the Dynamical “Bayesian” Brain
Abstract. The idea that the brain is a probabilistic (Bayesian) inference machine, continuously trying to figure out the hidden causes of its inputs, has become very influential in cognitive (neuro)sc...
direct.mit.edu
October 22, 2025 at 8:59 AM
Reposted by Jonathan Tsay
🚨Pre-print alert! 🚨https://www.biorxiv.org/content/10.1101/2025.10.17.683171v1

Our new study tackles the question: do all neurons in motor cortices (MC) encode movement & coordinate as we move? Answering this question will be key for effectively targeting motor representations in BCIs.
The spatiotemporal structure of neural activity in motor cortex during reaching
Intracortical brain-computer interfaces (BCI) leverage knowledge about neural representations to translate movement-related neural activity into actions. BCI implants have targeted broad cortical regi...
www.biorxiv.org
October 20, 2025 at 6:54 PM
Reposted by Jonathan Tsay
New Pre-Print:
www.biorxiv.org/cgi/content/...

We’re all familiar with having to practice a new skill to get better at it, but what really happens during practice? The answer, I propose, is reinforcement learning - specifically policy-gradient reinforcement learning.

Overview 🧵 below...
Policy-Gradient Reinforcement Learning as a General Theory of Practice-Based Motor Skill Learning
Mastering any new skill requires extensive practice, but the computational principles underlying this learning are not clearly understood. Existing theories of motor learning can explain short-term ad...
www.biorxiv.org
October 20, 2025 at 2:58 PM