Before the end of this year, I’m glad to share a short perspective/policy piece, recently out with @joshcjackson.bsky.social , Zhao Wang, and @williambrady.bsky.social: “Large AI Models Have a Prioritization Problem: Policy Implications and Solutions.”

New preprint: Empathy, Thick and Thin papers.ssrn.com/sol3/papers.... It is perhaps foolhardy to attempt to say something new about a topic as widely studied as empathy. I tried anyway! 1/

New from me - how AI-generated political videos have become just another part of social media, used to entertain, outrage and monitize attention theconversation.com/ai-generated...

Out now in Scientific Reports! Despite high correlations, ChatGPT models failed to replicate human moral judgments. We propose tests beyond correlation to compare LLM data and human data. With @mattgrizz.bsky.social @andyluttrell.bsky.social @chasmonge.bsky.social www.nature.com/articles/s41...

So there you have it, twin study estimates were greatly inflated, and molecular data sets the record straight. I walk through possible counter-arguments, but ultimately the uncomfortable truth is that genes contribute to traits much less than we always thought.

Great work by @natematias.bsky.social & Megan Price: public involvement in AI is an important part of rigorous science. AI systems are sociotechnical, meaning that the lived experience of the public is essential for validation, etc. www.pnas.org/doi/10.1073/...

New preprint out 📄 “Why Reform Stalls: Justifications of Force Are Linked to Lower Outrage and Reform Support.” Why do some cases of police violence spark reform while others fade? We look at how people explain them—through justification or outrage. osf.io/preprints/ps...

🚨Out in PNAS🚨 Examining news on 7 platforms: 1)Right-leaning platforms=lower quality news 2)Echo-platforms: Right-leaning news gets more engagement on right-leaning platforms, vice-versa for left-leaning 3)Low-quality news gets more engagement EVERYWHERE - even BlueSky! www.pnas.org/doi/10.1073/...

Excited to share a new preprint, accepted as a spotlight at #NeurIPS2025! Humans are imperfect decision-makers, and autonomous systems should understand how we deviate from idealized rationality Our paper aims to address this! 👀🧠✨ arxiv.org/abs/2510.25951 a 🧵⤵️

✨New preprint! Why do people express outrage online? In 4 studies we develop a taxonomy of online outrage motives, test what motives people report, what they infer for in- vs. out-partisans, and how motive inferences shape downstream intergroup consequences. Led by @felix-chenwei.bsky.social 🧵👇

These has been sharp rise in moralized language on social media Two processes explained this shift: (1) within-user increases in moral language over time (2) highly moralized users became more active while less moralized users disengaged osf.io/preprints/ps...

Posting is correlated with affective polarization: 😡 The most partisan users — those who love their party and despise the other — are more likely to post about politics 🥊 The result? A loud angry minority dominates online politics, which itself can drive polarization (see doi.org/10.1073/pnas...)

Reminder to apply to the DRRC postdoc fellowship! Deadline is this week.

Re-posting this because I really like it and I think we need to understand identity from a functionalist perspective more than ever. osf.io/preprints/ps...

1. We ( @jbakcoleman.bsky.social, @cailinmeister.bsky.social, @jevinwest.bsky.social, and I) have a new preprint up on the arXiv. There we explore how social media companies and other online information technology firms are able to manipulate scientific research about the effects of their products.

Great piece on the absurdity of brute force multiverse analyses. www.pnas.org/doi/10.1073/...

Can AI simulations of human research participants advance cognitive science? In @cp-trendscognsci.bsky.social, @lmesseri.bsky.social & I analyze this vision. We show how “AI Surrogates” entrench practices that limit the generalizability of cognitive science while aspiring to do the opposite. 1/

Last call for data-blitz and poster submission for the Computational Psychology preconference @spspnews.bsky.social! See thread below for details and hope to see you in Chicago!

🚨 New preprint 🚨 Across 3 experiments (n = 3,285), we found that interacting with sycophantic (or overly agreeable) AI chatbots entrenched attitudes and led to inflated self-perceptions. Yet, people preferred sycophantic chatbots and viewed them as unbiased! osf.io/preprints/ps... Thread 🧵

Our new paper finds that AI can overcome partisan #bias We find that AI sources are preferred over ingroup and outgroup sources--even when people know both are equally accurate (N = 1,600+): osf.io/preprints/ps...

The computational psych preconference is back @spspnews.bsky.social for a full day! This year's lineup: 👉theory-driven modeling: Hyowon Gweon 👉data-driven discovery: @clemensstachl.bsky.social 👉application: me 👉 panel: @steveread.bsky.social Sandra Matz, @markthornton.bsky.social Wil Cunningham

Only a small % of people engage in toxic activity online, but they’re responsible for a disproportionate share of hostile or misleading content on nearly every platform Because super-users are so active, they dominate our collective impression of the internet www.theguardian.com/books/2025/j...

New dataset that describes social media activity of a very large group of US elected officials: www.nature.com/articles/s41...

And here we are

Really cool work led by @hongkai1.bsky.social ✨ observational and experimental studies finding that differentiation helps explain the evolution of negative discourse online!

@aoc.bsky.social come hang out at Northwestern and we'll take you surfing on the great lakes!

I have been taking surfing lessons. Still in the beginner kook trenches, but celebrating my last time on a foam board 😎 Graduating to a hard top next session. It’s fun to learn new things! Even if you look like a goober at the beginning. 🏄🏽‍♀️

Yet again, machine learning — even gussied up via the transformer architecture — encodes and reinforces societal biases. This study reveals that LLM-based peer review relies heavily on author institution in its decisions. arxiv.org/abs/2509.15122

I suspect we are already at the point where students view writing a dissertation without LLMs the same as us millennials viewed writing a dissertation on a typewriter, i.e., unfathomable. No value judgment, just interesting how quickly that escalated.

Attempts at reducing online aggression (ie, cruel Reddit comments) by increasing empathy (eg, "There is a human being on the other side who might be hurt by your words") tended to backfire. www.sciencedirect.com/science/arti...

"psychological biases to overestimate the influence of self-interest on others’ behaviors and to attribute malicious intentions to those who harm us may create inherent challenges for punishment to effectively promote cooperation"

Apply to the awesome DRRC postdoc position at Kellogg. Open to any scholar who studies conflict and cooperation, very broadly construed. We’ve had some amazing people come through over the years. Note the earlier application deadline this year (Nov 1)!

📢JOB POSTING: Senior Director for the Center for Enlightened Disagreement (CED).📢 @nourkteily.bsky.social and I seek a strategic leader to help us build the Center (see ensuing post for information about CED). Target salary range: $125,000-$155,000. 1/2 careers.northwestern.edu/psc/hrnu_er/...

Check out our new pre-print in which we argue something that might be obvious but doesn't seem to be obvious to everyone: Large Language Models (such as ChatGPT) do not simulate human psychology.

Are you interested in topics related to conflict and intergroup relations *broadly construed*? Come join us as a postdoc in the Dispute Research Research Center! This position is up to 3 years, comes with your own research funding, and a phenomenal network of past DRRC postdocs.

🔖 NEW PAPER ALERT 🔖 Out in PNAS – we used equation discovery algorithms to improve models of human reinforcement learning. Led by the wonderful Kyle Lafollette with an amazing team Yanni Yuval @roeyschurr.bsky.social and @d-melnikoff.bsky.social www.pnas.org/doi/epdf/10....

Had a great time teaching a CSS workshop at SISPP - thanks to all the students and organizers! Future of social psych is looking bright 😎

If you're at @aomconnect.bsky.social #AOM2025, come check out our panel on NLP in organizations, featuring @dholtz.bsky.social, Sameer Srivastava, @williambrady.bsky.social, @mikeyeomans.bsky.social & me! We'll explore topics including hiring, cooperation, agency, and moral outrage -- don't miss it!

Excited to have contributed to this work led by @curtispuryear.bsky.social! Using large-scale text analyses, we show that moralization has increased on social media over the past decade and a half, less so on traditional media

English language is filled with trait words like “caring” and “smart” These words are the currency of personality/social psych, yet key questions remain about their evolution, function, and structure We take on these questions in a preprint led by @yuanzeliu.bsky.social osf.io/preprints/ps...

One of the largest-scale analyses of historical text data that I have contributed to The finding: language on social media has become more moralized over the 21st century; we don't see the same trends on news media Kudos to the first author @curtispuryear.bsky.social on the enormous effort

Social media often feels saturated with politics and morality - but is that feeling accurate? Our new paper finds that moralization has increased markedly on social media from 2013-2021, more than traditional media. See 🧵 below!

Fully transparent and open AI coming out of Switzerland soon. Something worth monitoring. ethz.ch/en/news-and-...

Do women feel some emotions more strongly than men do? Out today in Affective Science, I argue that claims like this make a notoriously subtle mistake. What is it? And what does it have to do with an astigmatic painter and thyroid medicine? A short thread... (1/14)

Want to easily scrape data from news media sites? There's an R package for that! paperboy "paperboy offers writers of web scrap[ers] a clear path to publish their code & earn co-authorship on the package, while deliver[ing] news media data from many websites in a consistent format."

💥New postdoc position! 💥 Join us to explore how people learn from each other—and how that drives cultural evolution. Run experiments, build computational models & collaborate across Europe w. @lucasmolleman.bsky.social 📍 Stockholm More info: shorturl.at/CY4wk

(1/4) Ever wondered what tech policy might look like if it were informed by research on collective intelligence and complex systems? 🧠🧑‍💻 Join @jbakcoleman.bsky.social, @lukethorburn.com, and myself in San Diego on Aug 4th for the Collective Intelligence x Tech Policy workshop at @acmci.bsky.social!

None of 10 Trump actions we asked about win majority support. The closest are deportation at 49% & Ukraine aid cuts at 41%. Trump cuts to university grants are least popular at 32%, & the rest fall between 32% & 39% Reps are roughly 60% more supportive than Dems across all actions. 4/

Thrilled to share that my first first-authored publication is officially out (soon to be in press at Social Cognition)! 🚀 "From Data to Discovery: Unsupervised Machine Learning in Social Cognition" 📄 OSF preprint: osf.io/preprints/os...

🎇It's #PubDay for THE HANDBOOK OF SOCIAL PSYCHOLOGY (6e)!🎇 This is the latest edition of the most venerated institution in social psychology, dating back to 1954. Fifty definitive chapters, over 8,000 manuscript pages. (The TOC appears below.) And: IT'S 100% OPEN-ACCESS: www.the-HSP.com.🧵