Sign in

Leor Hackel

@leorhackel.bsky.social
947 followers 609 following 19 posts

Assistant professor of psychology @ USC studying social learning and decision making. Social psych/social neuroscience. hackellab.org

PostsRepliesMedia
Reposted by Leor Hackel
aaron bornstein @aaronbornstein.bsky.social · 11/08/2026
New lab paper! @noraharhen.bsky.social and @catehartley.bsky.social investigate how children and adolescents differ in their use of episodic context for decision-making. Thread below.
0337
Leor Hackel @leorhackel.bsky.social · 02/08/2026
People use trait impressions selectively: a generous person might volunteer help but not be great at trivia. In contrast, our new work finds reward learning leads people to see others through a generally positive lens, biasing widespread impressions and choices: www.hackellab.org/media/Harris...
hackellab.org
0162
Reposted by Leor Hackel
kiraharris.bsky.social @kiraharris.bsky.social · 24/07/2026
1/4 Why do we gravitate toward some people over others? I'm excited to share new work with Peter Mende-Siedlecki, @andyluttrell.bsky.social, and @leorhackel.bsky.social! We use perceptions of others' personality traits more in related contexts, but rewards elicit general positivity 🧵👇
hackellab.org
1227
Reposted by Leor Hackel
Jay Van Bavel, PhD @jayvanbavel.bsky.social · 18/05/2026
People prefer to use “sycophantic” AI systems that reinforce their pre-existing beliefs. In a new paper (n=7,227), we found that people enjoyed interacting with sycophantic AI chatbots more than interacting with neutral chatbots or “disagreeable” chatbots that challenged their beliefs.
33735180
Leor Hackel @leorhackel.bsky.social · 20/04/2026
Men witness false bear; bear false witness
121
Reposted by Leor Hackel
Ashwini Ashokkumar @ashwinia.bsky.social · 06/04/2026
🚨🚨 My lab is hiring a Pre-doc Researcher/Lab Manager! 🚨🚨 Full-time pre-doc research opening in my lab at Harvard Psych (start: Summer/Fall 2026). Review begins April 10 Apply: jobs.smartrecruiters.com/HarvardUnive... Please repost + tag folks who might be a good fit! 👇
jobs.smartrecruiters.com
Research Assistant II
Company Description: By working at Harvard University, you join a vibrant community that advances Harvard's world-changing mission in meaningful ways, inspires innovation and collaboration, and builds...
13133
Reposted by Leor Hackel
Catherine Rampell @crampell.bsky.social · 04/04/2026
Slaughtering our golden goose: massive budget cuts for US science proposed again by Trump administration www.nature.com/articles/d41...
nature.com
Massive budget cuts for US science proposed again by Trump administration
Budget proposal would also curb federal payments for scientific publishing.
901868691
Reposted by Leor Hackel
Brendan Nyhan @brendannyhan.bsky.social · 08/03/2026
The sky is not falling; high-quality platforms (Prolific, Verasight, CR Connect) have low rates of apparent bots. osf.io/preprints/ps... But also not zero; vigilance is very much needed!
212857
Reposted by Leor Hackel
Heather L Kosakowski @kosakowski.bsky.social · 28/09/2025
My lab at USC is recruiting! 1) research coordinator: perfect for a recent graduate looking for research experience before applying to PhD programs: usccareers.usc.edu REQ20167829 2) PhD students: see FAQs on lab website dornsife.usc.edu/hklab/faq/
14227
Leor Hackel @leorhackel.bsky.social · 27/02/2026
If you’re at #SPSP2026, @yizhang96.bsky.social will be chairing a symposium tomorrow (9:30am, E265) on “Using Social Network Approaches to Understand Social Connection Formation.” Check it out for a great lineup of talks on social network approaches in social psych!
030
Reposted by Leor Hackel
Gavin Mullin @gavinmullin.bsky.social · 23/02/2026
It’s time yall! I’m excited to co-organize a symposium with @freemanjb.bsky.social at @spspnews.bsky.social this week!! Come by Friday morning (8am, room 450B) to see some amazing talks by phenomenal researchers! @xallysie.bsky.social @chujunlin.bsky.social @whatsinertia.bsky.social #SPSP2026
0159
Reposted by Leor Hackel
David Amodio @davidamodio.bsky.social · 26/02/2026
Attending the #SPSP2026 Social Cognition Preconference? I'll see you there! I'll be giving the talk for the Best Paper Award today at 3:45, representing my coauthors on this paper:
0122
Reposted by Leor Hackel
Raunak Pillai @rmpillai.bsky.social · 18/02/2026
New preprint with @jayvanbavel.bsky.social: Novel social identities shape belief in true and false information In 3 exps (N = 1,459) we randomly assigned people to one of two novel groups. People trusted (and then believed claims more from) their in-group osf.io/preprints/ps... Thread 🧵
osf.io
1197
Reposted by Leor Hackel
Andreas Olsson @emotionlabki.bsky.social · 17/02/2026
A few more days left to apply! Come work with us! We're hiring a postdoc to lead a new project on human social learning in threatening and volatile contexts. More info & apply: ki.varbi.com/en/what:job/...
ki.varbi.com
Postdoctoral Researcher in affective learning and decision-making
Do you want to contribute to top quality medical research? Our research group, led by Andreas Olsson at Karolinska Institutet in Stockholm, is seeking a qualified and motivated postdoctoral researcher
031
Reposted by Leor Hackel
João Guassi Moreira @jfguassimoreira.bsky.social · 12/02/2026
My lab at UW Madison is hiring a new lab manager! I’m looking for a motivated and detail-oriented person to help run the lab’s day-to-day, including our ongoing neuroimaging and behavioral studies. This is especially well suited for graduating undergrads thinking about grad school. Link below
12834
Reposted by Leor Hackel
Paul Stillman @stillman.bsky.social · 12/11/2025
How do we succeed at self-control? In a new paper in @pnas.org with James Wilson, David Kalkstein, and Melissa Ferguson, we use mouse-tracking of ~47,000 decisions of long-term over short-term to show that 'willpower' is too narrow a conception of self-control www.pnas.org/doi/abs/10.1...
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...
13117
Reposted by Leor Hackel
Jay Van Bavel, PhD @jayvanbavel.bsky.social · 16/10/2025
Exposure to individual solutions does not weaken belief in the need for structural change! Read the paper here: www.cambridge.org/core/journal... We find the same thing with climate change and public health across multiple massive global datasets (with evidence from 67 countries)
23210
Reposted by Leor Hackel
Yuan Chang Leong @ycleong.bsky.social · 13/10/2025
One of the papers I've been most excited about since starting the lab! We adopt a network neuroscience approach to understand how arousal reconfigures large-scale functional network organization to support memory of complex narratives!
35111
Reposted by Leor Hackel
Jean Luo @jeanieluo.bsky.social · 03/10/2025
Very excited to share that my first paper, with Peter Mende-Siedlecki and @leorhackel.bsky.social, is out now in @commspsychol.nature.com! ☺️ Can getting more rewards make you feel more skilled, even if your performance doesn't change? www.nature.com/articles/s44...
nature.com
Rewards bias self-evaluations of ability - Communications Psychology
People often receive rewards for good performance, but what happens when rewards do not reflect ability? Two behavioral studies suggest that rewards can impact how we evaluate our own ability, above and beyond the impact of actual performance.
53516
Leor Hackel @leorhackel.bsky.social · 25/09/2025
New work led by the brilliant @yizhang96.bsky.social: In lab experiments and naturalistic groups, people generalize perceptions of acceptance and rejection across social network ties.
0133
Reposted by Leor Hackel
Yi Zhang @yizhang96.bsky.social · 24/09/2025
New paper out in Journal of Experimental Social Psychology! 🎉 How do we figure out who will accept or reject us in a new group? We show that people generalize relational value across friendship ties—forming a network gradient of approach & avoidance. authors.elsevier.com/a/1lq3x51f8w...
1188
Reposted by Leor Hackel
Linas Nasvytis @linasnasvytis.bsky.social · 17/09/2025
🚨New paper out w/ @gershbrain.bsky.social & @fierycushman.bsky.social from my time @Harvard! Humans are capable of sophisticated theory of mind, but when do we use it? We formalize & document a new cognitive shortcut: belief neglect — inferring others' preferences, as if their beliefs are correct🧵
25016
Reposted by Leor Hackel
Brandon C Davidson @bcdavidson.bsky.social · 16/09/2025
🚨 New Preprint 🚨 Prolonged Isolation is associated with an increased behavioural sensitivity to ‘Likes’ on social media. 🧵 Social media rewards are inherently social—but does posting change during social isolation, when in-person social rewards are limited? It turns out, yes!
1318
Reposted by Leor Hackel
Mara Mather @maramather.bsky.social · 16/09/2025
We are hiring a full time project assistant! Please forward to any bright, curious team players you know who might be interested in applying: usc.wd5.myworkdayjobs.com/ExternalUSCC...
usc.wd5.myworkdayjobs.com
Project Assistant (Fixed-Term)
The University of Southern California (USC), founded in 1880, is located in the heart of downtown Los Angeles and is the largest private employer in the City of Los Angeles. USC is consistently ranked...
063
Reposted by Leor Hackel
Ido Ben-Artzi @idoba.bsky.social · 02/09/2025
Excited to share our new preprint! 🚨 Does human learning have an automatic aspect? Is it possible that we learn things that are counterproductive and only lead to reduced gains?
162
Reposted by Leor Hackel
Uri Hertz @urihertz.bsky.social · 30/07/2025
Hi friends - new paper! about the cognitive mechanisms underlying social categorization and polarization. "Increased complexity of social category markers leads to diverse rule-based categorizations and reduced intergroup bias" more below... royalsocietypublishing.org/doi/10.1098/...
royalsocietypublishing.org
Increased complexity of social category markers leads to diverse rule-based categorizations and reduced intergroup bias | Proceedings of the Royal Society B: Biological Sciences
Social categories are key to human social life, often leading to intergroup bias and stereotypes. While traditional studies use binary social markers, real-world markers are more complex. This study e...
1155
Leor Hackel @leorhackel.bsky.social · 30/07/2025
Our latest paper, led by @yizhang96.bsky.social, finds Pavlovian learning shapes empathy: People can link another person's abstract mental states—like feeling good or bad—with reward. This shapes empathy in new situations where those feelings are perceived.
1259
Reposted by Leor Hackel
Yi Zhang @yizhang96.bsky.social · 30/07/2025
🥳Excited to share that our new paper is live at Psychological Science @psychscience.bsky.social! We show that Pavlovian learning can grow empathy for another person. 🧵👇
2149
Leor Hackel @leorhackel.bsky.social · 29/07/2025
We are recruiting a joint lab manager at USC! (80% of time with @elisabaek.bsky.social, 20% of time in my lab). Our labs study social connection and social learning/decision-making using social neuro, social cognition, and computational modeling approaches. Please share!
060
Reposted by Leor Hackel
Isabella Kahhale @isabellakahhale.bsky.social · 07/07/2025
🚨New paper now out in Emotion!! As a post-bacc, Dr. Jamil Zaki & @leorhackel.bsky.social supported me in developing my own research project. 7+ years later, I received notice of publication acceptance the day before my dissertation defense🥲 Check out abstract and DM for PDF access!
162
Reposted by Leor Hackel
Yuan Chang Leong @ycleong.bsky.social · 02/07/2025
Excited to share our new review on how neuroimaging and computational models can help uncover how people see what they want to see, now out at @cp-trendscognsci.bsky.social! It was a blast writing this with Haena Kim and @iancballard.bsky.social www.sciencedirect.com/science/arti...
sciencedirect.com
A neurocomputational account of motivated seeing
Do goals, beliefs, and desires affect visual experience? This question has long been controversial in cognitive science. There exists extensive litera…
16220
Reposted by Leor Hackel
Benedek Kurdi @benedek.bsky.social · 21/06/2025
Paper in @pnas.org in which @d-melnikoff.bsky.social and I provide evidence for model-based effects on automatic evaluation. This was a super fun “adversarial” collaboration with 0 adversariality. It may have been nice to be right, but getting it right is nearly as nice: www.pnas.org/doi/10.1073/...
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...
2499
Reposted by Leor Hackel
Trends in Cognitive Sciences @cp-trendscognsci.bsky.social · 18/06/2025
The value of ecologically irrelevant animal cognition research Opinion by Scarlett Howard tinyurl.com/37aedmfx
0188
Reposted by Leor Hackel
Begüm Babür @begumbabur.bsky.social · 09/06/2025
I wrote about our new research on how the brain learns from social rejection — and why that matters for connection 👉 theconversation.com/your-brain-l...
theconversation.com
Your brain learns from rejection − here’s how it becomes your compass for connection
Rejection can feel physically painful. It also provides a lesson for your brain on whom to connect with and how.
032
Reposted by Leor Hackel
David Amodio @davidamodio.bsky.social · 12/05/2025
I’m thrilled to share my new paper on impression formation & updating in @natrevpsychol.nature.com! In it, I argue that impression formation is fundamentally a learning process. And as such, theories of impression formation should be based on mechanisms of learning and memory. Some key take-aways:
nature.com
A learning and memory account of impression formation and updating - Nature Reviews Psychology
Impression formation occurs when a perceiver infers another person’s traits, goals and preferences and forms an attitude towards that person. In this Perspective, Amodio describes the unique and inter...
26821
Reposted by Leor Hackel
Nature Reviews Psychology @natrevpsychol.nature.com · 29/04/2025
A learning and memory account of impression formation and updating Perspective by David M. Amodio (@davidamodio.bsky.social) Web: go.nature.com/3YTubx3 PDF: rdcu.be/ejREM #psychology #psychscisky
03014
Reposted by Leor Hackel
Helen Schmidt @helen-schmidt.bsky.social · 07/03/2025
Thrilled to share that my first, first-author paper is out now! Using an episode of 'Survivor', we find that distinct features of conversation – semantic similarity, emotional tone, and confidence – strongly inform observers about underlying social relationships. link.springer.com/article/10.3...
link.springer.com
Conversational linguistic features inform social-relational inference - Psychonomic Bulletin & Review
Whether it is the first day of school or a new job, individuals often find themselves in situations where they must learn the structure of existing social relationships. However, the mechanisms throug...
0123
Reposted by Leor Hackel
William J. Brady @williambrady.bsky.social · 14/02/2025
👀New preprint! In 3 prereg experiments we study how engagement-based algorithms amplify ingroup, moral and emotional (IME) content in ways that disrupt social norm learning (and test one solution!) w/ @joshcjackson.bsky.social and my amazing lab managers @merielcd.bsky.social & Silvan Baier 🧵👇
35221
Leor Hackel @leorhackel.bsky.social · 21/01/2025
If you’re a grad student or postdoc & would be interested in giving a virtual talk in our lab this semester, please email me! We work on social learning and choice, and work broadly relevant to reward/motivation, social cognition/connection, and/or prosociality would be of interest to our group.
hackellab.org
Social Learning & Choice Lab | Hackel Lab
The SLAC Lab investigates how we learn and make decisions in social interactions across behavior, the mind, and the brain. @ USC Department of Psychology
11511
Reposted by Leor Hackel
Michael Gilead @michaelgilead.bsky.social · 09/12/2024
🚨Thrilled to share our new study, led By Dr. Inon Raz, in Cerebral Cortex🚨: "The Future, Before, and After". The ability to imagine things we haven’t done before is one of the hallmarks of human cognition. How do we do it?
1155
Reposted by Leor Hackel
William J. Brady @williambrady.bsky.social · 28/11/2024
New paper out in @ScienceMagazine! In 8 studies (multiple platforms, methods, time periods) we find: misinformation evokes more outrage than trustworthy news, when it does it's shared more + ppl are less likely to read before sharing. w/ @killianmcl1 @Klonick @mollycrockett 🧵👇
12535201149
Reposted by Leor Hackel
Morteza Dehghani @mdehghani.bsky.social · 24/11/2024
Excited to share that our work on using AI to analyze police body camera footage was featured in Scientific American! We're using multi-perspective, multi-modal, models to better understand police interactions and identify areas for improvement. www.scientificamerican.com/article/ai-a...
scientificamerican.com
AI Analysis of Body Camera Videos Offers a Data-Driven Approach to Police Reform
Examining body camera videos at scale reveals racial differences in how police treat drivers during traffic stops—and what corrective programs really work
0147
Leor Hackel @leorhackel.bsky.social · 27/11/2024
A secondary but neat finding in our new work: We find neural evidence for rewards biasing social perception. We’ve previously found that rewards lead people to see others in a more positive light. We’ve argued this reflects a kind of affect-as-information… www.pnas.org/doi/10.1073/...
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...
13015
Reposted by Leor Hackel
Yuan Chang Leong @ycleong.bsky.social · 27/11/2024
Social rejection sucks, but they also provide a learning signal. Here we show that the two aspects of social rejection can be dissociated using computational modeling and neuroimaging. Delighted to have been able to be part of this work, definitely one of the most fun collaborations I've had!
0208
Reposted by Leor Hackel
Uri Hertz @urihertz.bsky.social · 26/11/2024
New paper! Led by Elena Kozakevitch-Arbel, with Simone Shamay-Tsoory, we used multi-dimensional reinforcement learning approach to examine whether people are sensitive to different dimensions of social scenarios during empathic interactions www.nature.com/articles/s44... 🧵
nature.com
Adaptive empathic response selection is sensitive to multiple dimensions of social interaction - Communications Psychology
When providing emotional support and deciding on an empathic reaction, responders were sensitive to changes in the person requiring empathy, the emotional state of that person, and the cause of their ...
13210
Leor Hackel @leorhackel.bsky.social · 26/11/2024
Excited to share our new work exploring how people learn from acceptance and rejection: www.pnas.org/doi/10.1073/... We find that the brain's 'social rejection' network tracks changes in how others value us—separate from reward learning about positive outcomes. See Begum’s thread below for more!
urldefense.com
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...
02812
Reposted by Leor Hackel
Yuan Chang Leong @ycleong.bsky.social · 21/11/2024
Excited to share this preprint of work led by @shangao.bsky.social, where we build a predictive model that maps prefrontal fNIRS activity to whole-brain fMRI during movie-watching!
0144
Reposted by Leor Hackel
Benedek Kurdi @benedek.bsky.social · 21/11/2024
Very excited to share this preprint with @thatadammorris.bsky.social and (newly minted ISCON Early Career Award winner) David Melnikoff in which we reexamine the question of whether people are aware of their implicit attitudes. TLDR: most likely not. psyarxiv.com/gak52/ For details, see 🧵 below.
1173
Reposted by Leor Hackel
USC Psychology @uscpsychology.bsky.social · 15/02/2024
Young minds can be savvy educators. 🧒📚 New work from the USC Minds in Development Lab reveals that 7-year-olds, but not 5-year-olds, adjust their teaching based on who's learning, giving simpler info to infants and more complex info to adults. doi.org/10.1111/cdev...
054
Leor Hackel @leorhackel.bsky.social · 07/02/2024
Excited to share new work in TiCS on Simplifying Social Learning: authors.elsevier.com/a/1iZ4S4sIRv... We highlight how social expertise lets us simplify complex reinforcement learning, offering a prototype for how people can turn hard learning problems into easier ones.
0199