Christian Hilbe

Exact conditions for evolutionary stability in indirect reciprocity under noise Author summary Understanding how cooperation can evolve and be sustained is a central question in evolutionary biology and social science. One prominent explanation is indirect reciprocity, where indi...

🗞️📣 New paper "Exact conditions for evolutionary stability in indirect reciprocity under noise" with @chilbe.bsky.social & @yohm.bsky.social

How can cooperation persist in large groups of unrelated individuals? Reputation 🗣️ But which social norms make this stable, even when mistakes happen?

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Strategies of reciprocity differ in whether players (here, player 1) take into account third-party interactions (here, between players 2 and 3). According to direct reciprocity, player 1 ignores third-party interactions. According to indirect reciprocity, player 1 takes such third-party interactions into account. The study's framework also allows for intermediate cases, where player 1 considers third-party interactions with some fixed probability λ.

A model of direct and indirect reciprocity—in which people act more favorably to people with good reputations—finds that full cooperation can always be sustained as a Nash equilibrium. In PNAS Nexus: academic.oup.com/pnasnexus/ar...

Although I'm formally a co-author of this paper, I actually learned quite a bit myself about both complex systems and multiagent learning while working on this project. Thanks Wolfram for leading this really nice effort to bring fields closer together!

How to cooperate for a sustainable future? We don't know (yet), but I'm thrilled to share that our new perspective piece has just been published in @pnas.org. Bridging complexity science and multiagent reinforcement learning can lead to a much-needed science of collective, cooperative intelligence.

This is a great opportunity to work with @yohm.bsky.social, one of the leading researchers in evolutionary game theory these days. 🙂
I can only recommend applying ⬇️

A little text about my journey with bipolar disorder. Seeing scientists speak openly about their experiences encouraged me to help break the stigma too. A part of me feels insecure about sharing this, but it also feels like the right thing to do.

adileyasar.github.io/one-of-these...

Corina Tarnita and I have discussed the relation between theoretical ecology and evolutionary game theory since my sabbatical in 2022. Now the paper is out, doi.org/10.1073/pnas... Cooperation in nature may not be mysterious when there are growth differences- questioning the notion of cooperation.

How valuable is memory? In my very first paper, now published in Economics Letters, together with @chilbe.bsky.social and @nikoletaglyn.bsky.social, we give sufficient conditions under which a player can afford to remember less than their opponent. 🧵

📜 doi.org/10.1016/j.ec...

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.

🚨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

Awesome news, congrats! 🙂

Postdoctoral Researcher in computational psychology/cognitive science with focus on social learning and cultural evolution Do you want to contribute to top quality research? The Mechanisms of Social Behavior lab at the Karolinska Institutet in Stockholm, Sweden is seeking a highly qualified postdoctoral researchers to joi

Just two days left to apply for this postdoc position in @bjornlindstrom.bsky.social's group in Stockholm, on an exciting project on social learning and cultural evolution ki.varbi.com/en/what:job/... in collaboration with Piet van den Berg (Leuven) and myself (Amsterdam). Reposts welcome!

🚨 POSTDOC WANTED 🚨

Join the Behavioral Economics of Crime & Conflict Group at MPICSL in Freiburg!

We're seeking a behavioral scientist with PhD in economics, psychology, or related. Experience with experiments is key.

Full time, 2 years, no teaching. Apply now!

tinyurl.com/FGR251

#EconSky

Thanks for making me aware of the paper! I'm wondering whether the choice of game makes the difference here (volunteer's dilemma versus prisoner's dilemma). Either way, I'll have to read the paper more closely! :-)

Thanks for making me aware! It seems to me the two studies have slightly different setups (in ours, participants keep their co-player for many rounds, and they "only" engage in two different versions of a prisoner's dilemma). But I like your setup and your results a lot!

Thanks David!

When individuals engage in several games, there can be spillovers from one game to another. In principle, such spillovers could be used strategically to promote cooperation across games. However, our experiment suggests people in concurrent games cooperate less, compared to a control treatment.

In game theory, we often assume that people only interact in one game at a time. In a new paper, we explore theoretically and experimentally how people cooperate when they engage in two games concurrently, either with the same partner or with different partners, www.nature.com/articles/s41...

🏰 PhD position on computational modelling | collective dynamics | cultural evolution 🏰

Get in touch with any questions you might have and join me in beautiful Marburg!

stellenangebote.uni-marburg.de/jobposting/c... (Deutsch)

stellenangebote.uni-marburg.de/jobposting/3... (English)

🚨 Annual IMPRS Call for Doctoral Positions at MPI-EvolBio 🚨
🎓 Fully-funded 3.5-year doctoral projects available in diverse research areas!
#PhD #ResearchOpportunities #IMPRS #Science evolbio.mpg.de/3801127/annu...

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We miss you already. Have a great start! 🙂

I am genuinely very excited to announce that I am officially a Research Scientist at the RIKEN Center for Computational Science in the Discrete Event Simulation team, led by Nobuyasu Ito! 🇯🇵 🗾 🗻

How do institutions enable large-scale cooperation? 🤝

Institutions promote cooperation but depend on cooperation to function. In a new study in @pnas.org,
@jbaptistandre.bsky.social, N. Baumard, @lfitouchi.bsky.social and I explore this paradox. 🧵

👉 www.pnas.org/doi/10.1073/...

A very nice journey with a great ending: In a new paper, @NikoletaGlyn describes how longer memory allows people to sustain reciprocal cooperation. For details, see 🧵 below 👇
Paper: www.pnas.org/doi/10.1073/...

Université PSL's new research network CultureLab is hiring two 5-year postdocs to develop computational methods to analyze cultural, historical, and social data! Research budget included - Deadline on 12-15-24, details below ⬇️

Last chance! Deadline tomorrow!

Our new paper in #PLOSBiology is out! With Román Zapién-Campos and Arne Traulsen we worked on extracting maximum statistical information from microbiome time series data for parameter inference. Check it out!

Open post-doc position at the Inverse Complexity Lab – Tiago P. Peixoto Inverse Complexity Lab

🚨Job alert!🚨

Come join us at the Inverse Complexity Lab @invcomplexity.skewed.de

We’re hiring a post-doctoral researcher to join our group at IT:U, Linz, Austria.

skewed.de/lab/call.html

Deadline is 30 Nov 2024. (Next Saturday!)

Spread the word.

#networkscience #complexsystems

Wow, thanks for sharing. What a great blogpost! 🙂