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Reposted by Jean-Baptiste André

EHBEA @ehbea.bsky.social · 1d

EHBEA is looking for new PRESIDENT and SECRETARY for 2026-2029! 👀

If you know of anybody who could represent EHBEA, nominate them as president!

If you know with good organisational skills, nominate them as secretary!

DEADLINE: 16/12/2026

HERE IS THE FORM 👇

docs.google.com/document/d/1...

EHBEACommitteeNominationForm_Pres_Sec.doc

EHBEA Committee 2026-2029: Nomination Form The EHBEA Steering Committee is calling for nominations for the following open committee positions for 2026-2029. You are invited to nominate one or more c...

docs.google.com

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Jean-Baptiste André @jbaptistandre.bsky.social · 14d

6/ Read the article @royalsocietypublishing.org 👉 doi.org/10.1098/rspb...

Evolutionary parsimony: an equilibrium refinement that sharply constrains the space of outcomes in games with multiple equilibria | Proceedings of the Royal Society B: Biological Sciences

Evolutionary game theory loses much of its predictive power in games with multiple equilibria. For such games, this article introduces a simple and general refinement principle, grounded in evolutiona...

doi.org

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Jean-Baptiste André @jbaptistandre.bsky.social · 14d

5/ Main consequence: in plausible evolutionary equilibria, reciprocal cooperation is guided by real cues of mutual benefit, never by bizarre rules tied to arbitrary cues unrelated to payoffs.

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Jean-Baptiste André @jbaptistandre.bsky.social · 14d

4/ What this article shows:
 In reality, the bizarre strategies of the folk theorem simply have no chance of ever emerging in the first place. So there is no need for mechanisms to choose between them—the problem is essentially an artefact of misapplied game theory.

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Jean-Baptiste André @jbaptistandre.bsky.social · 14d

3/ The most common solution in the literature: group selection. 
Since equilibria are too many, you (supposedly) need group selection to pick the most cooperative ones.

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Jean-Baptiste André @jbaptistandre.bsky.social · 14d

2/ Why is this a problem?
Because it prevents game theory from making precise predictions about social behavior.

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Jean-Baptiste André @jbaptistandre.bsky.social · 14d

1/ The old problem: the folk theorem and the extravagant diversity of equilibria in repeated games.
Game theory allows a proliferation of bizarre, counterintuitive patterns of behavior to qualify as equilibria.

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Jean-Baptiste André @jbaptistandre.bsky.social · 14d

Ever wanted to read about an old problem almost nobody cares about anymore?

Well, I wrote about it.

🧵

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Reposted by Jean-Baptiste André

Jorge Peña @jorgeapenas.bsky.social · 16d

📢 Apply to our (2-year) research fellowships at @iast.fr

Join a multidisciplinary, interdisciplinary, transdisciplinary, and indisciplinary group of scholars in Toulouse, walkable/cyclable pink city of chocolatines in the South of France.

Deadline: November 15, 2025.

www.iast.fr/research-fel...

Research Fellowships

Each year, IAST invites applications for post-doctoral Research Fellowships, which offer candidates an opportunity to devote themselves full-time to their research at the start of their careers. Fello...

www.iast.fr

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Reposted by Jean-Baptiste André

Dieter Lukas @dieterlukas.fediscience.org.ap.brid.gy · Jul 8

Our #study finds that #male #dominance isn't the norm among #primates, and starts to unravel what shapes flexibility in intersexual power

paper (OA) https://www.pnas.org/doi/10.1073/pnas.2500405122

press release https://www.mpg.de/24986976/0630-evan-beyond-the-alpha-male-150495-x?c=2249

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Reposted by Jean-Baptiste André

Alberto Acerbi @acerbialberto.com · Jul 7

EHB commentaries on Baumard and André's "The ecological approach to culture" are growing (see "Commentaries" section at the end). Good.
www.sciencedirect.com/journal/evol...

a man in a red jacket is eating a sandwich

ALT: a man in a red jacket is eating a sandwich

media.tenor.com

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Reposted by Jean-Baptiste André

Rob Sica @robsica.bsky.social · Jul 1

"a forest is not treated as the output of a second inheritance system or as a group-level adaptation... culture is not a transmitted substance; it is the structured context that emerges from repeated and overlapping individual actions"

Reconciling Our Three Traditions: Human Behavioral Ecology, Evolutionary Psychology, and Cultural Evolution - HBES

– by Nicolas Baumard & Jean-Baptiste André The evolutionary social sciences are grounded in the idea that evolutionary theory provides a unified framework to explain human behavior, including social n...

www.hbes.com

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Reposted by Jean-Baptiste André

Human Behavior & Evolution Society @humbehevosoc.bsky.social · Jun 30

Nicolas Baumard & Jean-Baptiste Andre’s “ecological view of culture” provides an exciting new perspective that links Behavioral Ecology, Evolutionary Psychology, & Cultural Evolution. Read more in their HBES blog post: www.hbes.com/reconciling-...

Reconciling Our Three Traditions: Human Behavioral Ecology, Evolutionary Psychology, and Cultural Evolution - HBES

– by Nicolas Baumard & Jean-Baptiste André The evolutionary social sciences are grounded in the idea that evolutionary theory provides a unified framework to explain human behavior, including social n...

www.hbes.com

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Reposted by Jean-Baptiste André

Jorge Peña @jorgeapenas.bsky.social · Jun 24

Here, weird guy from X, I fixed it for you:

"If a scientific society wants to be welcoming to [...] students & researchers [from the Global South], does it make sense to hold its next annual conference in a country that's notorious for [being located in the Global South]?"

The answer is Yes.

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Reposted by Jean-Baptiste André

Hugo Mercier @hugoreasoning.bsky.social · Jun 2

We have a lovely new paper out, showing that even ignorant people can be very good at recognising who's knowledgeable based on minimal cues

Edgar Dubourg @edgardubourg.bsky.social · Jun 2

We often have to judge who is knowledgeable—precisely when we are not. Can humans really do that? Our new paper in Psychological Science shows that, surprisingly, we can. drive.google.com/file/d/1b15E...

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Reposted by Jean-Baptiste André

Edgar Dubourg @edgardubourg.bsky.social · Jun 2

We often have to judge who is knowledgeable—precisely when we are not. Can humans really do that? Our new paper in Psychological Science shows that, surprisingly, we can. drive.google.com/file/d/1b15E...

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Reposted by Jean-Baptiste André

xavier roberts-gaal @xrg.bsky.social · May 20

the functional form of moral judgment is (sometimes) the nash bargaining solution

new preprint👇

figure 2 from our preprint, reporting the results from two experiments

we measure moral judgments about dividing money between two parties and manipulate the degree of asymmetry in the outside options each party has

we find that moral judgments track predictions from rational bargaining models like the nash bargaining solution and the kalai-smorodinsky solution in a negotiation context

by contrast, in a donation context, moral intuitions completely reverse, instead tracking redistributive and egalitarian principles

preprint link: https://osf.io/preprints/psyarxiv/3uqks_v1

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Reposted by Jean-Baptiste André

Sam Gershman @gershbrain.bsky.social · May 19

I think the BabyLM Challenge is really interesting, but also feel that there is something fundamentally ill-posed about how it maps onto the challenge facing human children. It's true that babies only get a relatively limited amount of linguistic experience, but...

The Transmitter @thetransmitter.bsky.social · May 19

Alona Fyshe @alonaf.bsky.social on the BabyLM Challenge, a competition that trains language models (LMs) on smaller datasets, more akin to how a baby learns, in search of solutions to some of the major challenges of today’s LLMs.

#NeuroAI #neuroskyence

www.thetransmitter.org/neuroai/the-...

Can babies inspire more efficient learning algorithms?

A competition that trains language models on smaller datasets, more akin to how a baby learns, seeks solutions to some of LLM’s major challenges.

www.thetransmitter.org

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Reposted by Jean-Baptiste André

Léo Fitouchi @lfitouchi.bsky.social · May 6

🧵New paper out in Cognition

Why do people moralize harmless carnal sins (e.g. gluttony, masturbation)?

@danielnettle.bsky.social & I find that these behaviors activate reciprocity-based moral judgment—no need for a distinct "purity" module.

50 days free link: authors.elsevier.com/a/1l18D2Hx2-...

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PCI Psychology @psych.peercommunityin.org · Apr 23

The PCI Psychology website is live! psych.peercommunityin.org We're working hard to be ready for launch (planned May 2025) but there's plenty you can do in the meantime to help it along. Go check it out! #psychscisky #scipub

PCI Psychology

Peer Community in Psychology

psych.peercommunityin.org

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Reposted by Jean-Baptiste André

Eleanor Power @eapower.bsky.social · Apr 21

Two more weeks to apply! Spread the word and reach out with any questions.

Eleanor Power @eapower.bsky.social · Apr 1

🚨Job alert! Two-year postdoc to join the Rep2SI project at @lsemethodology.bsky.social! We're looking for a modeller to join our team of ethnographers & experimentalists studying the role of reputation and reputational concern in perpetuating social inequality.
Apply by 4 May: tinyurl.com/yjccd3vv

Rep2SI: Reputation & the Reproduction of Social Inequality. A Leverhulme-funded project based at the LSE, combining ethnography, economic games, and modelling. We're looking for a modeller to join our core team as a two-year postdoctoral research officer.

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Reposted by Jean-Baptiste André

Dr Sam Roberts @samroberts7.bsky.social · Apr 18

Many thanks to all organisers of #EHBEA2025 for putting on such an inclusive and welcoming conference! @ehbea.bsky.social @ehbea2025.bsky.social

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Reposted by Jean-Baptiste André

EHBEA 2026 @ehbea2026.bsky.social · Apr 17

ℹ️ New announcement!!

#EHBEA2026 will be in Leiden! Save the date.

Prof. Gillian Brown @gillianrbrown1.bsky.social · Apr 16

Looking forward to EHBEA 2026 in Leiden, Netherlands. Dates for diary: 15-17 Apr 2026 #ehbea2025

Slide with information about next year's conference.

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Reposted by Jean-Baptiste André

EHBEA 2026 @ehbea2026.bsky.social · Apr 15

🧠✨ EHBEA 2025 — Tuesday Highlights ✨🧠

From cultural transmission to chatbots and grandmothers, here's what's coming up on Day 2 (April 15) at #EHBEA2025.

A thread 👇

@ehbea.bsky.social #HumanBehaviour #EvPsych #Anthropology #Research #EHBEA

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Olivier Morin @oliviermorin.bsky.social · Feb 10

Call for 5-years research fellowships at PSL university! @psl-univ.bsky.social Join the CultureLab team to research computational social science. www.dropbox.com/scl/fi/o5mkp...

www.dropbox.com

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