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Björn Lindström

@bjornlindstrom.bsky.social
1.1K followers 479 following 99 posts

Researching (social) learning and cultural evolution at Karolinska Institute, Sweden

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Reposted by Björn Lindström
Gaia Molinaro @gaiamolinaro.bsky.social · 08/10/2026
Our reward function compression work is now out in Nature Communications! 🎉 In it, we present and empirically test a computational framework that formalizes the trade-offs between goal flexibility and learning efficiency. @annecollins.bsky.social @natureportfolio.nature.com doi.org/10.1038/s414...
Conceptual model of goal-directed reinforcement learning with reward
function compression. In our proposed conceptual model, we break down goald-dependent learning into several parts. Combined with other learning components, an RL learning algorithm informs value estimates W on a given trial t, which are entered into a policy. The agent selects an action a through a joint policy, to which the environment responds by outputting outcome information o and a new state s. A working memory (WM) component organizes and maintains task-relevant information (here, broadly intended and dubbed the task information), used to support the reinforcement learning (RL) process. a Initially, value attribution to o is operated by WM,which maintains the current goal (g) and supports its matching to the experienced outcome to generate a reward r used by the RL agent. WM also holds a trace of recently experienced goals. b If goals share enough similar features,
a compressed reward function can be created, which replaces active goal maintenance and can, over time, be transferred to long-term memory storage. Eventually, the compressed reward function can be directly employed to assign value to experienced outcomes, sparing resources for other WM tasks.
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Björn Lindström @bjornlindstrom.bsky.social · 03/10/2026
Very curious about what @joinprolific.bsky.social are doing to really prevent agent from running tasks
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Dominik Deffner @dominikdeffner.bsky.social · 24/09/2026
Now published in @natcomms.nature.com! Using a 3D immersive-reality group experiment, we show how people integrate dynamically changing personal and social cues in realistic environments, resulting in either collective intelligence or maladaptive behavior! Paper: www.nature.com/articles/s41...
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Marlene Berke @marleneberke.bsky.social · 14/09/2026
Do non-human primates have theory of mind? My new paper takes a new computational approach to this classic question. We implemented verbal theories of primates' mental representations as computational models. These models completed classic visual perspective-taking tasks.
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Björn Lindström @bjornlindstrom.bsky.social · 22/09/2026
Nice! But an unfortunate overlap with EHBEA 29 March - 2 April 2027
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Julian Berger @officialberger.bsky.social · 22/09/2026
New paper out in @pnas.org 🚨 Human learning is an understudied but promising lever for boosting human–AI synergy @jasonburton.bsky.social @ralfkurvers.bsky.social @stefanherzog.bsky.social @dirkwulff.bsky.social
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Aaron Reichlin-Melnick @reichlinmelnick.bsky.social · 18/09/2026
My grandfather, who is 102 and a medical doctor, has told me about the times before polio was cured. Most years, upon returning to school after summer’s break, there would be some children would didn’t make it back to school because of polio.
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Simon Columbus @simoncolumbus.bsky.social · 14/09/2026
Autumn 2026 Cooperation Colloquia We have an exciting interdisciplinary series of speakers with Kasper Otten, @patkanngiesser.bsky.social, @charlesefferson.bsky.social @nikoletaglyn.bsky.social, Cameron Curtin, & Devesh Rustagi Sign up: list.ku.dk/postorius/li...
List of speakers: 
2026-09-18 | Kasper Otten (WODC / Erasmus University Rotterdam) | The ​co-occurrence of ingroup and outgroup prosociality across 121 societies
2026-10-02 | Patricia Kanngiesser (University of Plymouth)
2026-10-16 | Charles Efferson (Université de Lausanne)
2026-10-30 | Nikoleta Glynatsi (RIKEN Center for Computational Science)
2026-11-13 | Cameron Curtin (IAST)
2026-12-11 | Devesh Rustagi (University of Warwick)
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Riccardo Fusaroli @fusaroli.eurosky.social · 10/09/2026
TL;DR: DAGs + experiments showing that urban forms act as a cognitive-cultural niche. Grid layouts foster metric descriptions, irregular layouts landmark-based ones. These conventions transmit reliably across generations, but stabilize rapidly rather than progressively accumulating. 2/
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Mason Youngblood @masonyoungblood.bsky.social · 06/09/2026
New tutorial preprint about simulation-based inference! Shows how to fit a cultural evo model to baby name data using approx Bayesian computation, random forests, and deep learning. Wrote for @eslr.bsky.social but wanted to share with others in @culturalevolsoc.bsky.social! :) osf.io/preprints/so...
osf.io
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Gaia Molinaro @gaiamolinaro.bsky.social · 28/08/2026
Why do some goals spread across people and generations, while others emerge only transiently? We argue that human goals are both drivers and products of cultural evolution: our individual pursuits are shaped by our cultural environments, and the goals we pursue in turn reshape those environments.
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Nicholas A. Christakis @nachristakis.bsky.social · 24/08/2026
What role do social networks – and the precise nature and structure of social interactions – play in the production of public goods and in human welfare? What about social contagion? A thread on some of our #HNL experiments with many thousands of participants from 2010 to the present. 1/
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Nature Human Behaviour @nathumbehav.nature.com · 26/08/2026
Mentalizing and heuristics as distinct cognitive strategies in human teaching
dlvr.it
Mentalizing and heuristics as distinct cognitive strategies in human teaching
Nature Human Behaviour, Published online: 26 August 2026; doi:10.1038/s41562-026-02540-2Harootonian et al. find that people switch between effortful, tailored teaching and easier, simple shortcuts, favouring shortcuts even when unhelpful. Prompting participants to reflect on learners’ limitations restores effective, personalized instruction.
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Björn Lindström @bjornlindstrom.bsky.social · 20/08/2026
Hugo Mercier "not born yesterday"?
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Alexandre "Blublu" Bluet @blubludoesscience.bsky.social · 17/08/2026
New preprint! We investigate the role of language in the transmission of mental models in cultural evolution. Using a transmission chain design with over 2000 participants, we show that only language allows for the transmission and refinement of mental models. osf.io/preprints/ps...
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William Gibson @greatdismal.bsky.social · 17/08/2026
The idea of AI “hallucinating” is one I wish I’d had!
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Claudio Tennie @ctennie.bsky.social · 17/08/2026
Congratulations to the team. This suggests once more that know-how copying is needed for the range a d depth of human culture - at least in the sense of a necessary (though on its own insufficient) precondition of things that follow. [[For one cannot have language without know-how copying]]
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Björn Lindström @bjornlindstrom.bsky.social · 17/08/2026
@fierycushman.bsky.social @culturalevolsoc.bsky.social @cogscisociety.bsky.social
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Björn Lindström @bjornlindstrom.bsky.social · 17/08/2026
made possible by @erc.europa.eu and @kawresearch.bsky.social funding
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Björn Lindström @bjornlindstrom.bsky.social · 17/08/2026
When is language needed for human culture to accumulate? When observing successful behavior is not enough to recover the mental model behind it! This is an incredibly ambitious project, involving large-scale experimentation, RL and ABM modeling, and computational language analyses.
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Surabhi S Nath @surabhisnath.bsky.social · 16/07/2026
🚨 Paper Alert 🚨 Searching for concepts 🦓⚽ in memory 💭 is fundamental to our cognition. But how exactly do we represent 🗺️ and navigate 🏃‍♀️through concept spaces? osf.io/preprints/psyarxiv/adwzp
osf.io
OSF
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charlesefferson.bsky.social @charlesefferson.bsky.social · 02/08/2026
This fall, the Dept of Ecology and Evolution @ the Univ of Lausanne will be looking for an associate professor in behavioral ecology and cultural evolution. If that sounds like you, please apply. CH is an outstanding place to live and work. ⛰️🚄🔥 wwwfbm.unil.ch/releve/appli...
wwwfbm.unil.ch
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Paul Smaldino @psmaldino.bsky.social · 30/07/2026
A Demographic Theory of Similarity-Biased Social Learning. Now out in PNAS, led by the incomparable @apvelilla.bsky.social . We use modeling to explore conditions for the (cultural) evolution of parochial (and anti-parochial) learning biases. www.pnas.org/doi/10.1073/...
Humans adapt by learning from others, but risk acquiring maladaptive behaviors when learning from individuals facing different conditions. We present an evolutionary model exploring how individuals use social identity markers to select learning targets in diverse populations. Learners evolve biases that track reliable information sources: preferring similar individuals when in-group knowledge is adaptive, and dissimilar individuals when in-group behaviors are disadvantageous. Our framework demonstrates that this adaptive bias makes social learning viable even when it is costlier than individual learning. Additionally, we show that a minimum threshold of reliable cultural information is required for social learning to spread, providing a mathematical explanation for how demographic diversity drives population-level patterns of cultural segregation and assimilation.
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Ghent Center for Cognitive Neuroscience @ghentccn.bsky.social · 23/07/2026
Two time scales of adaptation in human learning rates doi.org/10.7554/eLif...
doi.org
Two time scales of adaptation in human learning rates
Humans adapt learning rates on both a fast and a slow time scale, and the central orbitofrontal cortex may represent the slow time scale.
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Dominik Deffner @dominikdeffner.bsky.social · 10/07/2026
Learning from the most successful people makes sense? We show that social learning, and especially payoff bias, is bad when choice outcomes are dependent on prior success💰 As such "rich-get-richer" dynamics are everywhere, this shows fundamental boundary conditions for the benefits of SL!
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Dirk Wulff @dirkwulff.bsky.social · 01/07/2026
🚨 Now out in PNAS In decision research, "talk is cheap." We show it isn't. Using LLMs to analyze participants' free-text explanations of their choices, we find verbal reports are a rich, scalable window into how people actually decide. 🔗 www.pnas.org/doi/10.1073/... Led by Kamil Fulawka
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Björn Lindström @bjornlindstrom.bsky.social · 26/05/2026
Semantic knowledge is key for human innovation and cultural evolution! Our paper (thread in repost), led by fantastic @anilyaman.bsky.social & rising star @ts-brain.bsky.social is out in @pnas.org! www.pnas.org/doi/10.1073/... I will present this work at APS Barcelona (29/5), happy to chat!
pnas.org
PNAS
Proceedings of the National Academy of Sciences (PNAS), a peer reviewed journal of the National Academy of Sciences (NAS) - an authoritative source of high-impact, original research that broadly spans...
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Björn Lindström @bjornlindstrom.bsky.social · 30/06/2026
@culturalevolsoc.bsky.social
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Oleg Sobchuk 🇺🇦 @sobchuk.bsky.social · 29/06/2026
📣 I'm hiring! Two positions (PhD student & Postdoc) in my ERC project Macroevolution of European Literature. Let's study the cultural evolution of literature using massive data 📚📈 📍Frankfurt | Apply by August 15 Details: www.aesthetics.mpg.de/en/career/jo... Please repost to help spread the word!
Job announcement of two positions at the Max Planck Institute for Empirical Aesthetics in Frankfurt: postdoc (Macroevolution of European Literature) and PhD student (Computational Literary Studies). Successful candidates will be affiliated with the research group Cultural Evolution of the Arts.
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Margot Finn @eicathomefinn.bsky.social · 29/06/2026
The AfD is predicted to become comfortably the largest party in elections in two German states, Saxony-Anhalt and Mecklenburg-Vorpommern, in September....The party is also currently leading in polls of voters at the national level.' 1/4
nature.com
Scientists fight back against far-right plans to restrict academic freedom in Germany
With the far-right Alternative for Germany leading in polls for national and state elections, institutions are facing up to proposed restrictions on academic freedom.
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Emerson Harkin @efharkin.bsky.social · 26/06/2026
Just in time for the start of next week's Braitenberg 100 symposium, I'm excited to share "Dopamine: From prediction to error," a site I built to better understand where the dopamine RPE hypothesis came from and where it might be headed. efharkin.com/s/dopamine-h... 1/3
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The Institute for Analytical Sociology @iasliu.bsky.social · 23/06/2026
The confirmed programme of the lecture series on Foundations and Frontiers of Analytical Sociology is now available online. The lectures will take place between September 2 and December 11, 2026. Please find the full programme, and short bios of the lecturers here: liu.se/en/news-item...
liu.se
World-leading researchers to headline new lecture series in analytical sociology
Some of the world's most influential researchers in analytical sociology, network science, and computational social science will visit Linköping University this autumn as part of a new international l...
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Ralf Kurvers @ralfkurvers.bsky.social · 15/06/2026
New preprint led by @lucasmolleman.bsky.social investigates social information use across the human lifespan. Testing >40,000 participants aged 6-80 in museums in Berlin and Japan. psyarxiv.com/hec96
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Iyad Rahwan | إياد رهوان @iyadrahwan.bsky.social · 09/06/2026
LLMs are used widely in the behavioral sciences. But we have no good standards for how to do so. We introduce a consensus-based reporting checklist to improve transparency, reproducibility and ethical accountability of LLM-based research in the behavioural sciences. www.nature.com/articles/s41...
nature.com
A reporting checklist for large language models in behavioural science - Nature Human Behaviour
Large language models offer new opportunities for behavioural science, but their rapid evolution poses challenges for research rigour. We introduce a consensus-based reporting checklist to improve tra...
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Kevin J Miller @kevinjmiller.bsky.social · 03/06/2026
Computational models are a key part of science but discovering new ones is hard! DataDIVER discovers concise models from data, which surface new mechanistic ideas and clear predictions for future experiments From Google Deepmind Neuroscience Lab + collaborators www.biorxiv.org/content/10.6...
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Stephan Lewandowsky @lewan.uk · 04/06/2026
🧵 Thread: Does the internet threaten democracy? I argue that it does in my latest piece in Science: doi.org/10.1126/scie... Here's the short version. 1/9 1/10
doi.org
The architecture of the internet creates risks for democracy
Will democracy survive the internet? Do we need to choose between Facebook’s surveillance capitalism or democracy? Layered lines of evidence can inform questions like these. When considered together, the evidence gives rise to a concerning picture, as summarized in a recent report for the European Commission that I co-led.
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MU-Peter Shimon 🀄 @mu-peter.bsky.social · 03/06/2026
Chimpanzee culture beyond the conspicuous: Evidence for broad-scale observational social learning in wild individuals🧪 www.cell.com/iscience/ful... Suggests wild chimpanzees use peering to learn a wide variety of skills, thereby highlighting unrecognized cultural potential in everyday behaviors.
Peering across the behavioral repertoire (predictions 2a-b)
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Alberto Acerbi @acerbialberto.com · 29/05/2026
"The Cultural Ecology of Social Media" is finally out! This article put together a series of thoughts I had in the past years, and that found a productive theoretical background in the ecological approach to culture developed by Baumard and André. www.cambridge.org/core/journal...
cambridge.org
The Cultural Ecology of Social Media | Evolutionary Human Sciences | Cambridge Core
The Cultural Ecology of Social Media
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Björn Lindström @bjornlindstrom.bsky.social · 27/05/2026
Two poster presentations from my group at #sbdm2026 in Paris. Magdalena Soukupová on the social learning mechanisms of human goal selection and @pierreledenmat.bsky.social on (lack of) mentalizing in social learning.
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Björn Lindström @bjornlindstrom.bsky.social · 27/05/2026
Thanks Jan!
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Björn Lindström @bjornlindstrom.bsky.social · 26/05/2026
Funded by @erc.europa.eu and @kawresearch.bsky.social
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Björn Lindström @bjornlindstrom.bsky.social · 26/05/2026
Semantic knowledge is key for human innovation and cultural evolution! Our paper (thread in repost), led by fantastic @anilyaman.bsky.social & rising star @ts-brain.bsky.social is out in @pnas.org! www.pnas.org/doi/10.1073/... I will present this work at APS Barcelona (29/5), happy to chat!
pnas.org
PNAS
Proceedings of the National Academy of Sciences (PNAS), a peer reviewed journal of the National Academy of Sciences (NAS) - an authoritative source of high-impact, original research that broadly spans...
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Lucas Gautheron @lucasgautheron.bsky.social · 25/05/2026
Popularity Feedback Constrains Innovation in Cultural Markets arxiv.org/abs/2602.09997 Come to my talks at CogSci and IC2S2 if you want to hear more about this project!
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Armin Lak @laklab.bsky.social · 22/05/2026
Awesome results from @fluketc.bsky.social @dudman.bsky.social and team, both for dopamine field and for all that train animals in tasks www.science.org/doi/10.1126/...
science.org
Reward magnitude determines reinforcement learning efficiency
Standard animal learning studies minimize individual reward magnitudes to maximize the repetitions of reinforced behaviors. We investigated how reward magnitude influences initial learning across five...
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Krajbich Lab @krajbichlab.bsky.social · 19/05/2026
Autonomous AI agents are now built into many browsers. A naive user can take an online survey with as little as the click of a button. For behavioral research, which depends heavily on online samples, this is a real problem. (1/7)
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Georgia Turner @georgiaturner.bsky.social · 18/05/2026
🚨 CALL FOR ABSTRACTS 🚨 1/ We invite proposals for posters and symposia for the New Directions in Social Media Research conference at St John’s College, University of Cambridge (7–8 Dec 2026). We especially welcome future-facing research on how the social world is changing in the digital age.
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Dr. Yin Wang @bruceyinwang.bsky.social · 12/05/2026
1/ I’m excited to share our new @NatureHumBehav paper “Social Functioning in Autism: A Systematic Review & Meta-analysis” 🧵We synthesized 35 yrs of autism research to ask a fundamental Question: How is social functioning organized, developed, and altered in autism? Free link: rdcu.be/figGl
rdcu.be
Social functioning in autism: a systematic review and meta-analysis
Nature Human Behaviour - Impaired social functioning is a core feature of autism spectrum disorders. This systematic review and meta-analysis synthesizes the evidence for this across studies...
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tadegquillien.bsky.social @tadegquillien.bsky.social · 06/05/2026
Our new paper with @maxtaylordavies.bsky.social introduces a resource-rational model of Theory of Mind. The model can explain many of the successes and failures of mindreading in human adults and children, and non-human primates. 🧵 royalsocietypublishing.org/rspb/article...
royalsocietypublishing.org
Factive mindreading reflects the optimal use of limited cognitive resources
Abstract. The capacity to represent the mental states of other individuals, known as ‘mindreading’ or ‘theory of mind’, is key to successful social predict
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Nicholas A. Christakis @nachristakis.bsky.social · 03/05/2026
For an early stage scientist: How to: Write an email Ask for a letter of recommendation Network Get new ideas Handle rejection Talk to reporters m.youtube.com/@NAChristakis
m.youtube.com
For the Love of Science
Weekly videos about the craft of science. A Human Nature Lab science outreach effort. Later in 2026, we will be expanding to include voices from other labs around the world.
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Tim Waring @twaring.bsky.social · 21/04/2026
Postdoctoral Fellow in Agent-based Human–Earth System Modelling at the Anthropocene Laboratory at the Stockholm Resilience Centre. su.varbi.com/en/what:job/... Deadline: June 15. @brunelcce.bsky.social @culturalevolsoc.bsky.social @durhamdcerc.bsky.social @michael.muthukrishna.com
su.varbi.com
Postdoctoral Fellow in Agent-based Human–Earth System Modelling
Stockholm Resilience Centre (SRC) is a leading international centre in sustainability science at Stockholm University. The Centre advances scientific understanding of the dynamic interactions between
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