Presented my recent paper “Predicting Module-Lattice Reduction” with Léo Ducas and Paola de Perthuis at Asiacrypt 2025 in Melbourne. A great way to wrap up the year! Merry Chrissy everyone :)

Australia Beach Shooting a Heinous Attack on Jewish Community Two gunmen opened fire on people celebrating the first night of the Jewish festival of Hanukkah. Sixteen people have been confirmed dead, including one of the shooters, with at least 42 injured.

The Bondi beach attack is the deadliest mass shooting in Australia in decades, after the 1996 Port Arthur Massacre. The shooting is a heinous attack on the Jewish community.

Authorities should invest substantially in efforts to counter threats.

More quality evidence is emerging that "pro-environmental behavior" is not a coherent, unitary thing. One behavior is not a proxy for all other behaviors.

www-sciencedirect-com.proxy.uba.uva.nl/science/arti... Blankenberg et al. 2025

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Very grateful that our paper was awarded ISCON’s Best 2024 Paper in Social Cognition!! Huge thanks to the fantastic team: Ben Stillerman, @bjornlindstrom.bsky.social , @leorhackel.bsky.social , Damaris Hagen, Nils Jostmann, and @davidamodio.bsky.social 🎊💐

🌱 Higher perceived complexity around climate mitigation was associated with lower policy support and intentions to act. Check out @saarataavila.bsky.social's awesome new paper on how perceived complexity can be measured (subscales: effectiveness uncertainty, trade-offs, and goal conflict).

🎊 New paper out! In this @cp-trendscognsci.bsky.social Forum, we (with @lucasmolleman.bsky.social and @bjornlindstrom.bsky.social) summarize how reward learning can lead to adaptive social learning. We also explore the broader consequences for cultural evolution:
www.cell.com/trends/cogni... 🚄

💥 Our new paper (with ‪@lucasmolleman.bsky.social and ‪@bjornlindstrom.bsky.social‬) is now out in @nathumbehav.nature.com‬ 🥳 www.nature.com/articles/s41...

🧠 Here, we advance a novel RL account—the Social Feature Learning (SFL) model—that explains how people learn to learn from others! 🤝

🧵👇

Feature-based reward learning shapes human social learning strategies - Nature Human Behaviour This research advances a mechanistic reward learning account of social learning strategies. Through experiments and simulations, it shows how individuals learn to learn from others, dynamically shapin...

Through experiments and simulations, this study shows how individuals learn to learn from others, dynamically shaping the processes involved in cultural evolution. @davidschultner.bsky.social @bjornlindstrom.bsky.social
@lucasmolleman.bsky.social
www.nature.com/articles/s41...

Expressing intentions is not climate action letter published in PNAS: https://www.pnas.org/doi/10.1073/pnas.2512457122

In our now published letter in @pnas.org, we raise two wider issues for behavioral science:

1) Intentions are poor predictors of behavior
2) Effects on intentions need not generalize to effects on behavior

We join calls for researchers to measure actual behavior: www.pnas.org/doi/10.1073/...

Very happy to share the first scientific publication of our microfibre-citizen science project! 🥳😊

How does participating in citizen science impact people’s views and behavior? See thread by @annabosshard.bsky.social for more details on the psychological outcomes of our study.

More to come soon…

Big shout out to the wonderful interdisciplinary team (from the Institute for Biodiversity and Ecosystem Dynamics and Psychology Research Institute of the University of Amsterdam): @cameronbrick.bsky.social, Bernou Boven, Julia Hijink @praetorius-a.bsky.social, & Lies Jacobs! 🙏

(5/5) Implications💡
- Longitudinal designs are well-suited for studying the transformative potential of citizen science
- Moving beyond concern, future work can test whether citizen science boosts personal & contextual drivers of environmental impact (like through skills training or policy advocacy)

(4/5) Results📉
- Most psychological constructs were not or only weakly related to pro-environmental washing behaviors in the urban Dutch survey
- Citizen scientists were mainly women & highly educated, but these demographics were unrelated to washing behaviors in the urban Dutch survey

(3/5) Results 📉
- Citizen science participation increased awareness of microfiber pollution and perceptions of household responsibility
- Participation did not change other psychological constructs (like environmentalist identity & social norms) or behavioral intentions to use the laundry bags

(2/5) Method 🔬
- 57 Dutch residents washed their clothes in laundry bags for 3 months, collected microfibers after each wash & completed pre and post surveys
- In addition, 814 urban Dutch residents completed a cross-sectional survey on demographics, psychological constructs & washing behaviors

Washing synthetic clothes is a major source of microplastic pollution. Citizen science can help understand which behaviors & materials cause most emissions, like through at-home data collection. We asked: Does participation also boost pro-environmental motivation? 🧵

pubs.rsc.org/en/Content/A...

Strikes are beginning, because the cuts are dire. This story has many twists and turns, but in short, Dutch universities are proposing to sacrifice certain programs like our Psychology BSc in English to hope to appease the nationalist government. This isn't done yet.

www.folia.nl/en/actueel/1...

Excited to join Bluesky! I’m a PhD candidate at CWI and QuSoft, working on quantum & classical algorithms for post-quantum cryptanalysis 🔑. Check out our recent paper here: arxiv.org/abs/2503.23238. Looking forward to connecting with others in quantum computing, cryptography, and beyond!

Local fossil fuel ad ban as a catalyst for global change Nature Climate Change - The Hague in the Netherlands was the first city in the world to enact a law prohibiting advertisements for fossil fuel products and services. Although the ban is restricted...

🚫 Why does #TheHague #fossilfuel advertising ban matter to mitigating #climatechange?

Our colleague Thijs Bouman & co-authors Jan Willem Bolderdijk & Keith Smith explore the impact of the bold initiative beyond its symbolism in a new paper:

www.nature.com/articles/s41...

Here's a short 🧵:

Scientists’ warning on affluence - Nature Communications Current environmental impact mitigation neglects over-consumption from affluent citizens as a primary driver. The authors highlight the role of bottom-up movements to overcome structural economic...

Climate action means taxing the rich.

We must "strengthen equality and redistribution through suitable taxation policies, basic income and job guarantees and by setting maximum income levels, expanding public services and rolling back neoliberal reforms"

www.nature.com/articles/s41...

🚨 New preprint out! 🚨

How do people make moral judgments as third parties? 👀 We show how two motivations—inequality aversion (fair = moral) ⚖️ and the common-is-moral heuristic (frequent = moral 👨‍👩‍👧‍👧—interact to shape evaluations 🧵👇

📄 osf.io/preprints/ps...

❓Do Left-wing Voters #Cycle more than Right-wing Voters? 🚲 🚲 🚲

Read our short paper in Findings

➡️ findingspress.org/article/1294...

🚨 New preprint! 🚨

We analysed over one million actions reported in the AWorld app, the UN's official platform for individual action on climate change: osf.io/preprints/ps...

This was an exciting collaboration with @kristiansn89.bsky.social, Jan Bauer, Laura Basconi, & @cameronbrick.bsky.social 🧵👇

If you're interested in post-growth economic thinking, this newly published article will be right up your street. It was a big pleasure to work on it with such a fantastic group of co-authors. Check it out here: www.sciencedirect.com/science/arti...

Welcome! You are invited to join a webinar: Ways of Repair : Loss and Damage Symposium | SESSION #3: Farhana Sultana – Decolonizing Climate Knowledge: Repairing Epistemic Injustice and Loss in the Er... In this session, interdisciplinary scholar, speaker, and author Dr. Farhana Sultana will present the text “Decolonizing Climate Knowledge: Repairing Epistemic Injustice and Loss in the Era of Climate ...

1/6. 📢 Sign up for the Ways of Repair : #LossAndDamage symposium to hear from @farhanasultana.com on "Decolonizing Climate Knowledge: Repairing Epistemic Injustice and Loss in the Era of #ClimateChange”

🗓️January 22nd 2025,
⏰14:00-15:00 GMT
📍Online
✏️Sign up here: zoom.us/webinar/regi...

My lovely colleagues at CAST are advertising 5 PhD funded places!

Couldn't think of a more wonderful team to do your PhD with ✨ 🌎

Emotions are reactions to situations we encounter in daily life. In our new paper in Psych Review (psycnet.apa.org/fulltext/202...; with @oisinryan.bsky.social and @fdabl.bsky.social), we take a first step towards building a generative model for emotion dynamics based on this simple principle 1/4

🎉 Embrace sufficiency 🎉

Sufficiency has great untapped potential to accelerate the energy transition.

In our new paper, we review key barriers, sketch how various actors can help overcome them, & draw broad lessons from transition studies for systemic change: www.sciencedirect.com/science/arti...

Does taking part in Veganuary put people off meat in the long term? Here’s what the evidence shows In 2024, 25 million people gave up meat for Veganuary. For many, it was a lasting change.

The Veganuary campaign, which encourages a plant-based diet in January, has successfully reduced meat consumption over the long term, with over 80% of participants reducing their intake to half or even more after six months.

.