Harrison Ritz

@hritz.bsky.social

cybernetic cognitive control computational cognitive neuroscience Connected Minds Fellow @ Queens + RRI he/him 🇨🇦 harrisonritz.github.io

One week left to apply for this job! Two notes: 1) We’re open to a really broad range of research programs. If you’re wondering “is my topic ‘high-level’ enough?” it probably is and you should apply. 2️⃣⬇️

Lindsey Powell@lindseypowell.bsky.social · 3w ago

UCSD Psychology is hiring!! We’re seeking a new assistant professor colleague who studies high-level human cognition, broadly construed. Please share and/or apply! apol-recruit.ucsd.edu/JPF04646

early-career academics, if you don't have a website, make yourself one. yes it's annoying but just do it it can be plain text on a white background, or google sites, or even a free Wix one with ads. nobody cares we just need to be able to look you up, quickly, bc there's like 100 other apps here

A 13,000-pound magnetically shielded room at Wu Tsai Neuro now houses one of the world's most advanced brain-scanning systems: OPM-MEG. @lauragwilliams.bsky.social & Milena Kaestner discuss how it works, its journey to Stanford, & hopes for its future. neuroscience.stanford.edu/news/brain-i...

A brain-imaging ‘Goldilocks’: OPM-MEG unveiled at Koret Human Neurosciences

A dedicated team of staff and faculty, innovative research ideas, and a 13,000-pound magnetically shield

neuroscience.stanford.edu

Our paper is out in Nature Communications! In our messy, noisy world, do you find planning difficult/less worthwhile? It's not just you. As we increased the stochasticity in a planning environment, we found that people spent less effort planning: www.nature.com/articles/s41... #cogsci #planning

Environmental stochasticity reduces human planning effort - Nature Communications

The real world is stochastic, making it difficult to know when planning is worthwhile. Here the authors show that as stochasticity increases, people spend less effort planning and adopt simpler, less ...

nature.com

Really chuffed about this one. It's impt for our efforts to understand neural and computational bases of controlling the contents of WM. It also highlights a control-related signal in the beta band that is NOT "inhibitory" in the way often assumed doi.org/10.1523/JNEU...

Prioritization in Working Memory Reduces Interference via Beta Band-Linked Stimulus Transformations

We studied the effects of prioritization in a two-step retrocuing task in which male and female humans hold two items in working memory, and the item not cued by the first cue cannot be dropped becaus...

doi.org

Medial PFC interacts with the hippocampus to retrieve context-congruent memories.. but HOW?? was what started this. Simulating mPFC-HIP🧠, we designed an RNN🤖 that retrieves memories similar in context, on top of self-attention. It learns to retrieve like humans faster! arxiv.org/abs/2609.37791

A neural network that maintains and retrieves memories based on context

Every day, people continuously infer situational context and adjust the way they understand and remember the world. Context, signaled by the prefrontal cortex, is known to modulate working memory and ...

arxiv.org

📣 Save the date! RLDM 2027, the Multi-disciplinary Conference on Reinforcement Learning and Decision Making, is coming to Paris, July 6-9, 2027 🎉 Stay tuned for submission deadlines and more updates on our website rldm.org 👀

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2 yrs ago, I briefly laid out a new theory of how motivation works (AGH). Here, I expand on the problems AGH was trying to solve, why they are hard to solve, what my solution looks like, and how this should change our understanding of thoughts & actions. osf.io/preprints/ps... 🧵A few highlights:

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Happy to have this finally out! TL;DR: The evolution of beliefs over time can be formulated as a dynamical system, and OFC neural activity appears to implement this system with its own dynamics. These emerge without explicit supervision—when animals learn to predict value in simple Pavlovian tasks

bioRxiv Neuroscience@biorxiv-neursci.bsky.social · last wk.

Dynamic belief representation and updating through learned attractor-like dynamics in the frontal cortex https://www.biorxiv.org/content/10.64898/2026.09.17.752495v1

🚨New preprint with Fei Dai, @hanqizhou.bsky.social and @alisongopnik.bsky.social We extend empowerment (control over external states) by turning it inward. *Representational empowerment* asks which representations a learner should acquire and curate to solve future problems arxiv.org/abs/2609.02322

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Alison Gopnik@alisongopnik.bsky.social · 4w ago

New paper with really interesting ideas from Fei and Hanqui, empowerment as a way of discovering representations as well as actions

since I'm getting many pokes about grad school applications, I wanted to re-up some previous public advice on grad school applications. looking back at it a year on, I still think all this is right, but let me update the 'research statement' part to include a bit on genAI:

Tomer Ullman@tomerullman.bsky.social · 11mo ago

It’s grad school application season, and I wanted to give some public advice. Caveats: -*-*-*-* 
> These are my opinions, based on my experiences, they are not secret tricks or guarantees 
> They are general guidelines, not meant to cover a host of idiosyncrasies and special cases