Andrey Chetverikov
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achetverikov.bsky.social
Andrey Chetverikov
@achetverikov.bsky.social
Associate Professor in Cognitive Psychology at the University of Bergen, Norway. I study decision-making and biases in perception and visual working memory, with occasional forays into higher level decisions. https://andreychetverikov.org
Pinned
Our new paper tests Bayesian and Demixing Model's ideas about the role of noise in serial dependence by manipulating prioritization in VWM via cueing and extra maintenance instruction, and finds mixed support for the models. 1/n bmcbiol.biomedcentral.com/articles/10....
#visualworkingmemory #vwm
Visual working memory prioritization modulates serial dependence beyond simple attentional effects - BMC Biology
Background Serial dependence (SD) is a contextual bias in visual processing, where current perception is influenced by past stimuli. This study explores how prioritization in visual working memory (VW...
bmcbiol.biomedcentral.com
Our response to "Visual attention in crisis" by @ruthrosenholtz.bsky.social is here www.cambridge.org/core/journal...
And here is the author's response to all comments: www.cambridge.org/core/journal... I found the target paper very thought-provoking, and Ruth's responses are insightful. But...
Attention is doing just fine! Just don’t take it too seriously | Behavioral and Brain Sciences | Cambridge Core
Attention is doing just fine! Just don’t take it too seriously - Volume 48
www.cambridge.org
November 26, 2025 at 10:41 AM
That's not what I would call "Dark Academia Jazz", Spotify
November 26, 2025 at 8:31 AM
Reposted by Andrey Chetverikov
And the next step? Full voxel-level modeling.

Recent numerical advances cracked the scalability barrier. Voxel-level hierarchical modeling is now feasible, revealing just how punishing traditional multiple-comparison adjustments really are.
arxiv.org/abs/2511.12825
SIMBA: Scalable Image Modeling using a Bayesian Approach, A Consistent Framework for Including Spatial Dependencies in fMRI Studies
Bayesian spatial modeling provides a flexible framework for whole-brain fMRI analysis by explicitly incorporating spatial dependencies, overcoming the limitations of traditional massive univariate app...
arxiv.org
November 18, 2025 at 10:13 PM
Reposted by Andrey Chetverikov
This project took over a decade to complete and I could not be more proud to be part of it...congrats @martinamorea.bsky.social! We show visual perception relies on time-consuming grouping mechanisms. Hope you enjoy the thread!

#VisionScience #PsychSciSky #Neuroskyence #Compneurosky
#Vision is often described as hierarchical and feedforward, progressing from low-level features to high-level representations. But are the early #feedforward stages truly the most essential for #perception?
Let us show you why not
jov.arvojournals.org/article.aspx... 🧵1/9
November 17, 2025 at 2:24 PM
Reposted by Andrey Chetverikov
More people need to know about MetaROR @metaror.bsky.social! If you are doing meta-research, then you get that the for-profit publishing system is a headache – you can help sideline journals by having your preprints handled by the MetaROR team for the peer review process. #AIMOS2025
November 20, 2025 at 10:13 AM
Just reposting this in case you missed it in the weekend haze =) I think finding that attention _does not_ affect serial dependence is quite intriguing.
Our results challenge previous claims that prioritization via attentional cueing modulates serial dependence (SD). Multiple previous studies suggested attended items/features produce stronger SD, but in two experiments we found no effect of precueing or postcueing—and we think we know why! 2/n
November 18, 2025 at 8:49 AM
Reposted by Andrey Chetverikov
paper🚨
When we learn a category, do we learn the structure of the world, or just where to draw the line? In a cross-species study, we show that humans, rats & mice adapt optimally to changing sensory statistics, yet rely on fundamentally different learning algorithms.
www.biorxiv.org/content/10.1...
Different learning algorithms achieve shared optimal outcomes in humans, rats, and mice
Animals must exploit environmental regularities to make adaptive decisions, yet the learning algorithms that enabels this flexibility remain unclear. A central question across neuroscience, cognitive science, and machine learning, is whether learning relies on generative or discriminative strategies. Generative learners build internal models the sensory world itself, capturing its statistical structure; discriminative learners map stimuli directly onto choices, ignoring input statistics. These strategies rely on fundamentally different internal representations and entail distinct computational trade-offs: generative learning supports flexible generalisation and transfer, whereas discriminative learning is efficient but task-specific. We compared humans, rats, and mice performing the same auditory categorisation task, where category boundaries and rewards were fixed but sensory statistics varied. All species adapted their behaviour near-optimally, consistent with a normative observer constrained by sensory and decision noise. Yet their underlying algorithms diverged: humans predominantly relied on generative representations, mice on discriminative boundary-tracking, and rats spanned both regimes. Crucially, end-point performance concealed these differences, only learning trajectories and trial-to-trial updates revealed the divergence. These results show that similar near-optimal behaviour can mask fundamentally different internal representations, establishing a comparative framework for uncovering the hidden strategies that support statistical learning. ### Competing Interest Statement The authors have declared no competing interest. Wellcome Trust, https://ror.org/029chgv08, 219880/Z/19/Z, 225438/Z/22/Z, 219627/Z/19/Z Gatsby Charitable Foundation, GAT3755 UK Research and Innovation, https://ror.org/001aqnf71, EP/Z000599/1
www.biorxiv.org
November 17, 2025 at 7:18 PM
Reposted by Andrey Chetverikov
We're hiring!

The University of Akureyri is seeking a specialist in psychology. Applicants from all areas of psychology are welcome to apply.
Open Position: Assistant Professor at the Faculty of Psychology
The University of Akureyri is seeking a specialist in psychology. Applicants from all areas of psychology are welcome to apply, but particular emphasis is placed on the following fields: clinical psyc...
www.unak.is
November 3, 2025 at 9:28 PM
Our new paper tests Bayesian and Demixing Model's ideas about the role of noise in serial dependence by manipulating prioritization in VWM via cueing and extra maintenance instruction, and finds mixed support for the models. 1/n bmcbiol.biomedcentral.com/articles/10....
#visualworkingmemory #vwm
Visual working memory prioritization modulates serial dependence beyond simple attentional effects - BMC Biology
Background Serial dependence (SD) is a contextual bias in visual processing, where current perception is influenced by past stimuli. This study explores how prioritization in visual working memory (VW...
bmcbiol.biomedcentral.com
November 15, 2025 at 11:08 AM
Two authors reanalyze the data from an earlier paper, cannot replicate the findings, and conclude that the original is wrong. The twist: the first author is the same on both papers. I only wonder why the original is not retracted.
link.springer.com/article/10.3...
link.springer.com/article/10.3...
Category effects on stimulus estimation: Shifting and skewed frequency distributions—A reexamination - Psychonomic Bulletin & Review
Duffy, Huttenlocher, Hedges, and Crawford (Psychonomic Bulletin & Review, 17(2), 224–230, 2010) report on experiments where participants estimate the lengths of lines. These studies were designed to t...
link.springer.com
November 14, 2025 at 4:22 PM
Reposted by Andrey Chetverikov
"Professors' inboxes are like kids' lunchboxes - they require constant viligance and lots of things fester when they inevitably go unattended. In other words, when professors don't respond, it's rarely personal. They probably forgot or got too busy. Email again"
My lab site is very much still under construction, but we are in #grad application season and I thought I'd blog about stuff I discuss often with prospective applicants to our program in #anthropology. Check it out. Let me know hits and misses.

www.evolvedlab.net/blog
Blog | Evolve D Lab
www.evolvedlab.net
November 13, 2025 at 8:12 AM
I'm not a rhythms person, but this illustration deserves a repost.
November 13, 2025 at 1:22 PM
Reposted by Andrey Chetverikov
Super excited to share a new preprint!

We asked a simple-but-big question:

What changes in the brain when someone becomes an expert?

Using chess ♟️ + fMRI 🧠 + representational geometry & dimensionality 📈, we ask:

1️⃣ WHAT information is encoded?
2️⃣ HOW is it structured?
3️⃣ WHERE is it expressed?

1/n
November 12, 2025 at 10:56 PM
Reposted by Andrey Chetverikov
The Ponizsa illusion - Kanizsa triangle produces Ponzo illusion, but oddly it inverts apparent depth: the longer line looks closer! Also has an inversion effect like we studied in Altan et al 2025 Proc Roy Soc (doi.org/10.1098/rspb...) but it's also in reverse! 🤔
#visionscience #psychscisky
November 12, 2025 at 2:58 AM
Reposted by Andrey Chetverikov
We wrote the Strain on scientific publishing to highlight the problems of time & trust. With a fantastic group of co-authors, we present The Drain of Scientific Publishing:

a 🧵 1/n

Drain: arxiv.org/abs/2511.04820
Strain: direct.mit.edu/qss/article/...
Oligopoly: direct.mit.edu/qss/article/...
November 11, 2025 at 11:52 AM
This is my soul animal at the cover of the new Andrew Bird's EP (good music as well)

soundcloud.com/andrewbird/s...
November 10, 2025 at 4:00 PM
FYI, if you are using Zotero, koofr.eu provides a free 10 gb cloud with webdav that could be used for synchronizing pdfs. I tested it this week as I no longer have access to the server I used previously. Seems to work well. koofr.eu/blog/posts/k...
Koofr with Zotero via WebDAV
Are you using Zotero with Box and don’t know what to do when Box support for WebDAV eventually runs out? Are you searching for Zotero with Box alternative? Don’t fret, Koofr is here for you. Read abou...
koofr.eu
November 8, 2025 at 4:11 PM
There was a paper in Science few years back claiming that they could get temporal precision on the scale of ms from _fMRI_ data. It caused quite a discussion in the lab I worked at. Turns out, it's been retracted this September: www.science.org/doi/10.1126/... Is there a thread about it somewhere?
Retraction
On 14 October 2022, Science published the Research Article “In vivo direct imaging of neuronal activity at high temporospatial resolution” by P. T. Toi et al. (1). On 24 August 2023, Science ran an Ed...
www.science.org
November 8, 2025 at 4:05 PM
Huge congrats to @ben-kop.bsky.social on a successful PhD defense! Ben, it was my great pleasure to work with you, and I will also fondly remember our little chats at parties and conferences =) All the best in your career, wherever it takes you.
November 5, 2025 at 4:48 PM
Reposted by Andrey Chetverikov
We see the forest, but what do we know about the trees? Our perception of ensembles may be richer than previously thought. Read more in a post by @ankosov.bsky.social on a new #psynomPBR paper by Vladislav Khvostov @khvo100v.bsky.social, Árni Gunnar Ásgeirsson, & Árni Kristjánsson buff.ly/3NCjHIz
November 4, 2025 at 9:01 PM
Reposted by Andrey Chetverikov
Please repost! I am looking for a PhD candidate in the area of Computational Cognitive Neuroscience to start in early 2026.

The position is funded as part of the Excellence Cluster "The Adaptive Mind" at @jlugiessen.bsky.social.

Please apply here until Nov 25:
www.uni-giessen.de/de/ueber-uns...
November 4, 2025 at 1:57 PM
Reposted by Andrey Chetverikov
"I wanted a real ship, because the ship is a character... I wanted the movie to test the capabilities of every single craft in moviemaking." —Guillermo del Toro @realgdt.bsky.social

More dates/showtimes added for FRANKENSTEIN > 🎟 bit.ly/Belcourt-FRANKENSTEIN
November 4, 2025 at 2:00 AM
Reposted by Andrey Chetverikov
Lol. Ibn Khaldun (1332-1406) had a few bangers too, like this: "people publish too much"
November 4, 2025 at 5:06 AM
Reposted by Andrey Chetverikov
Open tenure track the University of Akureyri, Iceland.
November 3, 2025 at 9:33 PM
Reposted by Andrey Chetverikov
Now I'm also looking for a research software engineer to implement a pile of research results to R packages loo, posterior, bayesplot, projpred, priorsense, brms or/and Python packages ArviZ, Bambi and Kulprit. Apply by email with no specific deadline (see contact info at users.aalto.fi/~ave/)
I'm now also looking for a postdoc with strong Bayesian background and interest in developing Bayesian cross-validation theory, methods and software. Apply by email with no specific deadline (see contact information at users.aalto.fi/~ave/).

Others, please share
I'm looking for a doctoral student with Bayesian background to work on Bayesian workflow and cross-validation (see my publication list users.aalto.fi/~ave/publica... for my recent work) at Aalto University.

Apply through the ELLIS PhD program (dl October 31) ellis.eu/news/ellis-p...
November 3, 2025 at 11:13 AM