Dominik Deffner
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dominikdeffner.bsky.social
Dominik Deffner
@dominikdeffner.bsky.social
1.5K followers 1.1K following 69 posts
Assistant Professor for Computational Modelling of Behaviour @unimarburg.bsky.social | Collective decision-making and cultural evolution | https://www.uni-marburg.de/en/fb04/team-deffner/deffner
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Reposted by Dominik Deffner
birchlse.bsky.social
Martin Peterson's creative response to being banned from teaching Plato (shared with his permission).
An email from Martin Peterson to university administrators.
January 8, 2026 at 5:38 PM
Reposted by Dominik Deffner
masonyoungblood.bsky.social
Proc B with @sampassmore.bsky.social! We used simulations to explore the innovation strategies of speed climbers 🧗‍♀️ Innovation is higher among slower athletes and lower when the population size is larger, and the overall balance of innovation and copying appears to be suboptimal 🔗 bit.ly/499QjZM
Simulation-based inference with deep learning suggests speed climbers combine innovation and copying to improve performance
Abstract. In the Olympic sport of speed climbing, athletes compete to reach the top of a 15 m wall as quickly as possible. Since the standardization of the
bit.ly
January 8, 2026 at 2:00 PM
Reposted by Dominik Deffner
masonyoungblood.bsky.social
Happy new year! I wanted to share my new Python package called chatter that streamlines the process of applying AI/ML models to animal communication 🦜🦇🐋🐵👨‍🌾 masonyoungblood.github.io/chatter/
January 2, 2026 at 4:59 PM
Reposted by Dominik Deffner
drkeichhorn.bsky.social
Angebote für Studierende, "die noch nicht so gern prompten, weil sie lieber selbst formulieren und denken wollen."

Dazu fällt mir auch nichts mehr ein.
Zeitungsauszug: "Der LMU Career Service veranstalte rund 80 Events im Jahr für alle Branchen und Berufe, darunter eine KI-Akademie, die sich auch an Studenten richtet, die noch nicht so gern prompten, weil sie lieber selbst for-, mulieren und denken wollen."
December 27, 2025 at 1:08 PM
Reposted by Dominik Deffner
mchimento.bsky.social
🎉🍾 very excited to see this out before 2025 ends doi.org/10.1111/2041... with Will Hoppitt in @methodsinecoevol.bsky.social. This paper is an overview of our new R package STbayes, a user-friendly toolkit for performing Bayesian NBDA analyses. @cbehav.bsky.social @mpi-animalbehav.bsky.social
STbayes: An R package for creating, fitting and understanding Bayesian models of social transmission
A critical consequence of joining social groups is the possibility of social transmission of information related to novel behaviours or resources. Network-based diffusion analysis (NBDA) has emerg...
doi.org
December 20, 2025 at 8:55 AM
Reposted by Dominik Deffner
theoschaefer.bsky.social
Happy to share this early Christmas present 🎄: our paper about geometry- and locomotion-dependence of 3D memory got published in PNAS! Joint work with co-first-author Volker Reisner (@reisnerv.bsky.social) as well as Leonard König, Misun Kim & Christian Doeller
www.pnas.org/doi/10.1073/
www.pnas.org
December 22, 2025 at 11:00 PM
Reposted by Dominik Deffner
nanditagarud.bsky.social
Grateful to share our paper on gene-specific selective sweeps in human gut microbiomes, now out in Nature! It has been a joy to work with @rwolff.bsky.social, whose insights and hard work made this possible.
www.nature.com/articles/s41...
Gene-specific selective sweeps are pervasive across human gut microbiomes - Nature
Development and application of the integrated linkage disequilibrium score (iLDS) reveals both selective pressures impacting the human gut microbiome and the mechanisms by which gut bacteria adapt to ...
www.nature.com
December 17, 2025 at 6:53 PM
Reposted by Dominik Deffner
danielheck.bsky.social
Interesting postdoc position on modeling psychological resilience at the DKFZ Hector Cancer Institute, Mannheim:

jobs.dkfz.de/en/jobs/1682...

--> dynamic/latent-variable models, Bayesian hierarchical models, causal inference, time-series analysis, cognitive modelling
Postdoctoral Researcher in Quantitative Psychology / Data Science in Psychology
jobs.dkfz.de
December 17, 2025 at 3:47 PM
Reposted by Dominik Deffner
alexisjbreen.bsky.social
Ending 2025 strong—new paper out today in #ProcB!
Dynamic strategic social learning in nest-building zebra finches and its generalizability 🐦🌿🧠👩‍💻
Preprint thread below 👇
Paper: royalsocietypublishing.org/rspb/article...
December 17, 2025 at 12:26 PM
Reposted by Dominik Deffner
avehtari.bsky.social
We're doing the final sprint, and I think we're able to send the PDF of the forthcoming Bayesian Workflow book to the publisher in the next two weeks (500+ pages), which would mean it would be published some time next year
December 16, 2025 at 5:21 PM
Reposted by Dominik Deffner
ruben.the100.ci
Psychologists, what are your favorite (open) data sets for teaching multilevel modelling? I have a lot of observational examples, would love a therapy RCT with varying effects for therapists or some such.
December 15, 2025 at 10:27 AM
Reposted by Dominik Deffner
lfoswaldo.bsky.social
It's out!!

www.science.org/doi/10.1126/...

Big thank you to my coauthors @small-schulz.bsky.social and @lorenzspreen.bsky.social, and to all participants who discussed 20 political issues over 4 weeks in 6 subreddit, 3 experimental conditions and let us observe.
December 11, 2025 at 10:34 AM
Reposted by Dominik Deffner
lorenzspreen.bsky.social
Christmas came early this year! Very happy to see our paper out in Science Advances. Led by @lfoswaldo.bsky.social, we ran a unique collective field-experiment on Reddit, to better understand who is participating in online debates and why.

Paper: www.science.org/doi/10.1126/...

And more below 👇
December 10, 2025 at 9:32 PM
Reposted by Dominik Deffner
rmcelreath.bsky.social
I'm teaching Statistical Rethinking again starting Jan 2026. This time with live lectures, divided into Beginner and Experienced sections. Will be a lot more work for me, but I hope much better for students.

I will record lectures & all will be found at this link: github.com/rmcelreath/s...
course schedule as a table. Available at the link in the post.
December 9, 2025 at 1:58 PM
Reposted by Dominik Deffner
eslr.bsky.social
Would you like to share your research skills with the ESLR community? Starting next year, we will be hosting regular online sessions serving as a platform of mutual exchange and support among early-career researchers. Please do get in touch if you are interested in hosting a session!
December 8, 2025 at 9:33 AM
Reposted by Dominik Deffner
alexmesoudi.com
New paper out in Phil Trans with Angel Jimenez, Keith Jensen and Lei Chang

From information free-riding to information sharing: how have humans solved the cooperative dilemma at the heart of cumulative cultural evolution?

royalsocietypublishing.org/rstb/article...
From information free-riding to information sharing: how have humans solved the cooperative dilemma at the heart of cumulative cultural evolution?
Abstract. Cumulative cultural evolution, where populations accumulate ever-improving knowledge, technologies and social customs, is arguably a unique featu
royalsocietypublishing.org
December 4, 2025 at 10:23 AM
Reposted by Dominik Deffner
shoalgroup.bsky.social
PhD opportunity: MOVE
Details: blogs.reading.ac.uk/crocus-dla/c...
Deadline: 12/01/26
Supervisors: @shoalgroup.bsky.social, @inesfuertbauer.bsky.social, @wlallen.bsky.social, @nhcooper123.bsky.social, @marinapapa.bsky.social
Apply: blogs.reading.ac.uk/crocus-dla/p...
November 20, 2025 at 9:09 AM
Reposted by Dominik Deffner
boonfalleur.bsky.social
Happy to share our latest study published in PNAS.

Using data from 274,316 French students, we find that lower-SES students are less likely to wait for better university offers, even when waiting would lead to more prestigious or better-fit programs.
www.pnas.org/doi/10.1073/...
Waiting time during admission procedures increases social inequalities in higher education | PNAS
Many domains in life require people to wait to access better outcomes, such as waiting in line to access prized tickets for a show, waiting to obta...
www.pnas.org
November 26, 2025 at 9:27 AM
Reposted by Dominik Deffner
alexthewitty.bsky.social
Over the moon to announce that, as of last Friday, I’m officially #PhDone! I’d like to thank everyone who supported me along the way, including, but not limited to, my amazing supervisor @thecharleywu.bsky.social, and all members (past or present) of the HMC lab and the @velezcolab.bsky.social 🎓
November 25, 2025 at 5:35 PM
Reposted by Dominik Deffner
ehowaspi.bsky.social
Our New Paper is out in Nature Human Behaviour: 🚨 Culture is critical in driving orangutan diet development past individual potentials! 🦧 www.nature.com/articles/s41.... See 🧵
Culture is critical in driving orangutan diet development past individual potentials - Nature Human Behaviour
Howard-Spink et al. develop an empirically based model of orangutan diet development, which suggests that social learning is vital for orangutans to acquire varied diets.
www.nature.com
November 24, 2025 at 11:05 AM
Reposted by Dominik Deffner
bjjbarrett.bsky.social
Postdoc position in individual-level incentives, social
learning, and payoff-biased imitation shape group-level accuracy in complex prediction and decision-making tasks in Konstanz

files.newsletter2go.com/l3slzozn/s_i...
files.newsletter2go.com
November 17, 2025 at 9:27 AM
Reposted by Dominik Deffner
christophvoelter.bsky.social
Fully funded #PhDposition in Comparative Cultural Psychology @mpi-eva-leipzig.bsky.social.
We will use touchscreen experiments & eyetracking to study mental simulations in nonhuman apes & human children across different cultures.

All info here: www.eva.mpg.de/career/posit...
Please share / apply!🙏
Positions available - Max Planck Institute for Evolutionary Anthropology
www.eva.mpg.de
November 13, 2025 at 8:32 AM
Reposted by Dominik Deffner
benkawam.bsky.social
New paper!

We propose a framework to empirically study animal social relationships by modelling social network (SN) data as time-series—that is, without the need to aggregate them over time.

www.biorxiv.org/content/10.1...
Each dyad (a, b) moves through four discrete states over time, represented by coloured circles. The dyad remains in a given state for a certain duration, or "holding time", before transitioning to a new state according to state-specific transition probabilities, indicated by arrows showing all possible (non-zero) transitions. Paintings by Sofia M. Pereira & Judith von Nordheim.
November 12, 2025 at 11:56 AM
Reposted by Dominik Deffner
benjaminpitt.bsky.social
Do people remember where things are relative to their body (e.g. my left side) or relative to the environment (the North/uphill side)? The answer is both at once, according to my new paper now out in Psychological Science! 🧵 journals.sagepub.com/doi/10.1177/...
Sage Journals: Discover world-class research
Subscription and open access journals from Sage, the world's leading independent academic publisher.
journals.sagepub.com
November 12, 2025 at 1:01 PM
Reposted by Dominik Deffner
hansonmark.bsky.social
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/...
A table showing profit margins of major publishers. A snippet of text related to this table is below. 1. The four-fold drain 1.1 Money Currently, academic publishing is dominated by profit-oriented, multinational companies for whom scientific knowledge is a commodity to be sold back to the academic community who created it. The dominant four are Elsevier, Springer Nature, Wiley and Taylor & Francis, which collectively generated over US$7.1 billion in revenue from journal publishing in 2024 alone, and over US$12 billion in profits between 2019 and 2024 (Table 1A). Their profit margins have always been over 30% in the last five years, and for the largest publisher (Elsevier) always over 37%. Against many comparators, across many sectors, scientific publishing is one of the most consistently profitable industries (Table S1). These financial arrangements make a substantial difference to science budgets. In 2024, 46% of Elsevier revenues and 53% of Taylor & Francis revenues were generated in North America, meaning that North American researchers were charged over US$2.27 billion by just two for-profit publishers. The Canadian research councils and the US National Science Foundation were allocated US$9.3 billion in that year. A figure detailing the drain on researcher time. 1. The four-fold drain 1.2 Time The number of papers published each year is growing faster than the scientific workforce, with the number of papers per researcher almost doubling between 1996 and 2022 (Figure 1A). This reflects the fact that publishers’ commercial desire to publish (sell) more material has aligned well with the competitive prestige culture in which publications help secure jobs, grants, promotions, and awards. To the extent that this growth is driven by a pressure for profit, rather than scholarly imperatives, it distorts the way researchers spend their time. The publishing system depends on unpaid reviewer labour, estimated to be over 130 million unpaid hours annually in 2020 alone (9). Researchers have complained about the demands of peer-review for decades, but the scale of the problem is now worse, with editors reporting widespread difficulties recruiting reviewers. The growth in publications involves not only the authors’ time, but that of academic editors and reviewers who are dealing with so many review demands. Even more seriously, the imperative to produce ever more articles reshapes the nature of scientific inquiry. Evidence across multiple fields shows that more papers result in ‘ossification’, not new ideas (10). It may seem paradoxical that more papers can slow progress until one considers how it affects researchers’ time. While rewards remain tied to volume, prestige, and impact of publications, researchers will be nudged away from riskier, local, interdisciplinary, and long-term work. The result is a treadmill of constant activity with limited progress whereas core scholarly practices – such as reading, reflecting and engaging with others’ contributions – is de-prioritized. What looks like productivity often masks intellectual exhaustion built on a demoralizing, narrowing scientific vision. A table of profit margins across industries. The section of text related to this table is below: 1. The four-fold drain 1.1 Money Currently, academic publishing is dominated by profit-oriented, multinational companies for whom scientific knowledge is a commodity to be sold back to the academic community who created it. The dominant four are Elsevier, Springer Nature, Wiley and Taylor & Francis, which collectively generated over US$7.1 billion in revenue from journal publishing in 2024 alone, and over US$12 billion in profits between 2019 and 2024 (Table 1A). Their profit margins have always been over 30% in the last five years, and for the largest publisher (Elsevier) always over 37%. Against many comparators, across many sectors, scientific publishing is one of the most consistently profitable industries (Table S1). These financial arrangements make a substantial difference to science budgets. In 2024, 46% of Elsevier revenues and 53% of Taylor & Francis revenues were generated in North America, meaning that North American researchers were charged over US$2.27 billion by just two for-profit publishers. The Canadian research councils and the US National Science Foundation were allocated US$9.3 billion in that year. The costs of inaction are plain: wasted public funds, lost researcher time, compromised scientific integrity and eroded public trust. Today, the system rewards commercial publishers first, and science second. Without bold action from the funders we risk continuing to pour resources into a system that prioritizes profit over the advancement of scientific knowledge.
November 11, 2025 at 11:52 AM