Bastian Jaeger
@bxjaeger.bsky.social
Assistant Professor @ Tilburg University 🇳🇱
❤️🧠Moral Psychology & Altruism
🌚🌝First impressions & Social biases
🔬📊Meta-science
❤️🧠Moral Psychology & Altruism
🌚🌝First impressions & Social biases
🔬📊Meta-science
Reposted by Bastian Jaeger
I wrote a blog for the Meta-Research Center expressing my infinite frustration about not getting data. What else is new, you might think? Well, I added an extra layer of annoyance directed at the journals who do NOTHING to enforce promised data sharing.
metaresearch.nl/blog/2026/2/...
metaresearch.nl/blog/2026/2/...
Promised Data Unavailable? – I’m Sorry, Ma’am, There’s Nothing We Can Do — Meta-Research Center
This blogpost has been written by Michèle Nuijten. Michèle is an assistant professor of our research group who investigates reproducibility and replicability in psychology. Also, she is the developer ...
metaresearch.nl
February 3, 2026 at 3:03 PM
I wrote a blog for the Meta-Research Center expressing my infinite frustration about not getting data. What else is new, you might think? Well, I added an extra layer of annoyance directed at the journals who do NOTHING to enforce promised data sharing.
metaresearch.nl/blog/2026/2/...
metaresearch.nl/blog/2026/2/...
Researchers often present participants with stimuli that are assumed to reliably and exclusively evoke one, and only one, emotion category. This study shows that this is rarely the case for some widely used stimuli.
doi.org/10.1037/emo0...
doi.org/10.1037/emo0...
February 3, 2026 at 2:09 PM
Researchers often present participants with stimuli that are assumed to reliably and exclusively evoke one, and only one, emotion category. This study shows that this is rarely the case for some widely used stimuli.
doi.org/10.1037/emo0...
doi.org/10.1037/emo0...
Reposted by Bastian Jaeger
1/9 New blog is live! This is part 2 of a series—last time we looked at the Dunning-Kruger effect, now we are digging in to Implicit vs Explicit attitudes and the Implicit Association Test. To start, of course we need a good meme...
haines-lab.com/post/part-2-...
haines-lab.com/post/part-2-...
January 26, 2026 at 5:45 PM
1/9 New blog is live! This is part 2 of a series—last time we looked at the Dunning-Kruger effect, now we are digging in to Implicit vs Explicit attitudes and the Implicit Association Test. To start, of course we need a good meme...
haines-lab.com/post/part-2-...
haines-lab.com/post/part-2-...
Reposted by Bastian Jaeger
It's a beautiful plot, but it's terribly misleading about the impact of pre-registration. More recent studies (with higher sample sizes) find very little impact of pre-registration on the publication of null results.
Here's a thread with some references (1/N)
Here's a thread with some references (1/N)
@scientificdiscovery.dev Hi, I am creating a new version of my free online MOOC, and would like to use this picture, of which you have the copyright. Is it ok if I put it in a slide?
February 2, 2026 at 1:47 PM
It's a beautiful plot, but it's terribly misleading about the impact of pre-registration. More recent studies (with higher sample sizes) find very little impact of pre-registration on the publication of null results.
Here's a thread with some references (1/N)
Here's a thread with some references (1/N)
Registered report (with 885 US MTurkers) finds no evidence for the claim that people with higher chronic loneliness have a stronger tendency to anthropomorphize nonhuman objects @giladfeldman.bsky.social
doi.org/10.1037/cns0...
doi.org/10.1037/cns0...
February 2, 2026 at 1:56 PM
Registered report (with 885 US MTurkers) finds no evidence for the claim that people with higher chronic loneliness have a stronger tendency to anthropomorphize nonhuman objects @giladfeldman.bsky.social
doi.org/10.1037/cns0...
doi.org/10.1037/cns0...
Reposted by Bastian Jaeger
8.0% of citations in the medical literature contain major errors.
E.g., the cited work makes the opposite claim or is unrelated to the claim in the citing article.
E.g., the cited work makes the opposite claim or is unrelated to the claim in the citing article.
Systematic review and meta-analysis of quotation inaccuracy in medicine - Research Integrity and Peer Review
Background Quotations are crucial to science but have been shown to be often inaccurate. Quotation errors, that is, a reference not supporting the authors’ claim, may still be a significant issue in s...
link.springer.com
February 2, 2026 at 10:37 AM
8.0% of citations in the medical literature contain major errors.
E.g., the cited work makes the opposite claim or is unrelated to the claim in the citing article.
E.g., the cited work makes the opposite claim or is unrelated to the claim in the citing article.
Reposted by Bastian Jaeger
Using randomly assigned identities, ppl were more likely to accept identity-congruent misinformation despite equal knowledge, supporting identity-protective motivated reasoning as a key driver of misinformation acceptance. #EvPsych #cogpsyc #SocialPsyc
#polipsy
journals.sagepub.com/doi/full/10....
#polipsy
journals.sagepub.com/doi/full/10....
Understanding Partisan Bias in Judgments of Misinformation: Identity Protection Versus Differential Knowledge - Tyler J. Hubeny, Lea S. Nahon, Bertram Gawronski, 2026
People overaccept information that supports their identity and underaccept information that opposes their identity—a phenomenon known as partisan bias. Although...
journals.sagepub.com
February 1, 2026 at 12:40 PM
Using randomly assigned identities, ppl were more likely to accept identity-congruent misinformation despite equal knowledge, supporting identity-protective motivated reasoning as a key driver of misinformation acceptance. #EvPsych #cogpsyc #SocialPsyc
#polipsy
journals.sagepub.com/doi/full/10....
#polipsy
journals.sagepub.com/doi/full/10....
Reposted by Bastian Jaeger
New paper out:
Some people are systematically better at judging others’ intelligence.
Who are the best judges? People WHO are intelligent themselves, have good emotion-perception ability, and who are high in well-being.
www.sciencedirect.com/science/arti...
Some people are systematically better at judging others’ intelligence.
Who are the best judges? People WHO are intelligent themselves, have good emotion-perception ability, and who are high in well-being.
www.sciencedirect.com/science/arti...
The good judge of intelligence
Accurately judging others' intelligence is important, yet little is known about individual differences in this ability. In this study we investigated …
www.sciencedirect.com
January 16, 2026 at 3:35 PM
New paper out:
Some people are systematically better at judging others’ intelligence.
Who are the best judges? People WHO are intelligent themselves, have good emotion-perception ability, and who are high in well-being.
www.sciencedirect.com/science/arti...
Some people are systematically better at judging others’ intelligence.
Who are the best judges? People WHO are intelligent themselves, have good emotion-perception ability, and who are high in well-being.
www.sciencedirect.com/science/arti...
Reposted by Bastian Jaeger
I built a basic shiny app to check doi's (with help of LLM, Claude Opus). The use case is for when students submit work with fabricated references (I used to randomly check, this will systematically check). Note it comes with no warranties,... . tvpollet.github.io/2026-01-30-D...
tvpollet.github.io
January 30, 2026 at 3:33 PM
I built a basic shiny app to check doi's (with help of LLM, Claude Opus). The use case is for when students submit work with fabricated references (I used to randomly check, this will systematically check). Note it comes with no warranties,... . tvpollet.github.io/2026-01-30-D...
Reposted by Bastian Jaeger
Out now and open access for four weeks as the editor's choice Topic in Focus in American Psychologist.
Contrary to popular belief, evolutionary psychology hypotheses are testable and falsifiable.
psycnet.apa.org/fulltext/202...
Contrary to popular belief, evolutionary psychology hypotheses are testable and falsifiable.
psycnet.apa.org/fulltext/202...
January 29, 2026 at 5:08 PM
Out now and open access for four weeks as the editor's choice Topic in Focus in American Psychologist.
Contrary to popular belief, evolutionary psychology hypotheses are testable and falsifiable.
psycnet.apa.org/fulltext/202...
Contrary to popular belief, evolutionary psychology hypotheses are testable and falsifiable.
psycnet.apa.org/fulltext/202...
Reposted by Bastian Jaeger
📣Revised preprint by @cas-goos.bsky.social
Measurement reliability, validity, and reporting in psychology still has a long way to go...
We compared original studies w replications, and where possible recalculated reliability & unidimensionality.
Some findings >
osf.io/preprints/ps...
Measurement reliability, validity, and reporting in psychology still has a long way to go...
We compared original studies w replications, and where possible recalculated reliability & unidimensionality.
Some findings >
osf.io/preprints/ps...
OSF
osf.io
January 7, 2026 at 3:53 PM
📣Revised preprint by @cas-goos.bsky.social
Measurement reliability, validity, and reporting in psychology still has a long way to go...
We compared original studies w replications, and where possible recalculated reliability & unidimensionality.
Some findings >
osf.io/preprints/ps...
Measurement reliability, validity, and reporting in psychology still has a long way to go...
We compared original studies w replications, and where possible recalculated reliability & unidimensionality.
Some findings >
osf.io/preprints/ps...
People think that non-human animals have thoughts and feelings, but not in the same way that humans do.
In a large sample of children & adolescents (n > 1k) from 15 countries, results looked very similar across countries and age groups.
doi.org/10.1016/j.je...
In a large sample of children & adolescents (n > 1k) from 15 countries, results looked very similar across countries and age groups.
doi.org/10.1016/j.je...
January 29, 2026 at 2:23 PM
People think that non-human animals have thoughts and feelings, but not in the same way that humans do.
In a large sample of children & adolescents (n > 1k) from 15 countries, results looked very similar across countries and age groups.
doi.org/10.1016/j.je...
In a large sample of children & adolescents (n > 1k) from 15 countries, results looked very similar across countries and age groups.
doi.org/10.1016/j.je...
Reposted by Bastian Jaeger
I hate this: "The Editors have retracted this article... the Mini-Mental State Examination (MMSE) instrument was used without proper permissions" link.springer.com/article/10.1... The MMSE is a series of 11 simple questions. A perfectly good paper is retracted because you can copyright 11 questions
Retraction Note: Cognitive function assessed by Mini-mental state examination and risk of all-cause mortality: a community-based prospective cohort study - BMC Geriatrics
BMC Geriatrics -
link.springer.com
January 28, 2026 at 11:33 AM
I hate this: "The Editors have retracted this article... the Mini-Mental State Examination (MMSE) instrument was used without proper permissions" link.springer.com/article/10.1... The MMSE is a series of 11 simple questions. A perfectly good paper is retracted because you can copyright 11 questions
Large, cross-cultural study (n > 6k, 25 nations) on international prosociality finds that
- ingroup favoritism is widespread
- more similarities between two nations = more prosociality
- people from rich nations give more to people from poor nations
doi.org/10.1093/pnas...
- ingroup favoritism is widespread
- more similarities between two nations = more prosociality
- people from rich nations give more to people from poor nations
doi.org/10.1093/pnas...
January 28, 2026 at 1:38 PM
Large, cross-cultural study (n > 6k, 25 nations) on international prosociality finds that
- ingroup favoritism is widespread
- more similarities between two nations = more prosociality
- people from rich nations give more to people from poor nations
doi.org/10.1093/pnas...
- ingroup favoritism is widespread
- more similarities between two nations = more prosociality
- people from rich nations give more to people from poor nations
doi.org/10.1093/pnas...
"Children between the ages of 4 to 11 years traded off their moral concern for other species against the cultural importance of human food practices."
journals.sagepub.com/doi/pdf/10.1...
journals.sagepub.com/doi/pdf/10.1...
January 27, 2026 at 1:33 PM
"Children between the ages of 4 to 11 years traded off their moral concern for other species against the cultural importance of human food practices."
journals.sagepub.com/doi/pdf/10.1...
journals.sagepub.com/doi/pdf/10.1...
Some people consistently restrict their prosociality to a narrow group of individuals, whereas others extend it to a wider range of groups.
Restricted prosociality was most strongly correlated with traits such as Machiavellianism, narcissism, and psychopathy.
doi.org/10.1037/pspp...
Restricted prosociality was most strongly correlated with traits such as Machiavellianism, narcissism, and psychopathy.
doi.org/10.1037/pspp...
January 26, 2026 at 2:07 PM
Some people consistently restrict their prosociality to a narrow group of individuals, whereas others extend it to a wider range of groups.
Restricted prosociality was most strongly correlated with traits such as Machiavellianism, narcissism, and psychopathy.
doi.org/10.1037/pspp...
Restricted prosociality was most strongly correlated with traits such as Machiavellianism, narcissism, and psychopathy.
doi.org/10.1037/pspp...
Reposted by Bastian Jaeger
How many versions of the Iowa Gambling Task (IGT) exist? And how much does this affect research using the IGT? More than you might think. 🧵
Methodological Flexibility in the Iowa Gambling Task Undermines Interpretability: A Meta-method Review: https://osf.io/4g3vr
January 25, 2026 at 11:16 AM
How many versions of the Iowa Gambling Task (IGT) exist? And how much does this affect research using the IGT? More than you might think. 🧵
Reposted by Bastian Jaeger
The Iowa Gambling Task is an extreme example of Jingle Fallacy and schmeasurement.
In 100 articles we found 244 different ways of scoring it, 177 were never reused. Correlations between them range -.99 to .99.
At the same time, we show meta-analyses combine these results as if they’re equivalent.
In 100 articles we found 244 different ways of scoring it, 177 were never reused. Correlations between them range -.99 to .99.
At the same time, we show meta-analyses combine these results as if they’re equivalent.
How many versions of the Iowa Gambling Task (IGT) exist? And how much does this affect research using the IGT? More than you might think. 🧵
Methodological Flexibility in the Iowa Gambling Task Undermines Interpretability: A Meta-method Review: https://osf.io/4g3vr
January 25, 2026 at 12:01 PM
The Iowa Gambling Task is an extreme example of Jingle Fallacy and schmeasurement.
In 100 articles we found 244 different ways of scoring it, 177 were never reused. Correlations between them range -.99 to .99.
At the same time, we show meta-analyses combine these results as if they’re equivalent.
In 100 articles we found 244 different ways of scoring it, 177 were never reused. Correlations between them range -.99 to .99.
At the same time, we show meta-analyses combine these results as if they’re equivalent.
Whose job is it to solve climate change?
This study asked Dutch residents and political and business representatives and they mostly agreed on the answer. It's mostly the others' responsibility 🙃
iopscience.iop.org/article/10.1...
This study asked Dutch residents and political and business representatives and they mostly agreed on the answer. It's mostly the others' responsibility 🙃
iopscience.iop.org/article/10.1...
January 21, 2026 at 2:31 PM
Whose job is it to solve climate change?
This study asked Dutch residents and political and business representatives and they mostly agreed on the answer. It's mostly the others' responsibility 🙃
iopscience.iop.org/article/10.1...
This study asked Dutch residents and political and business representatives and they mostly agreed on the answer. It's mostly the others' responsibility 🙃
iopscience.iop.org/article/10.1...
Reposted by Bastian Jaeger
Social media research has a conflict of interest problem:
“these findings suggest industry influence in social media research is extensive, impactful, and often opaque”
A real concern is that this may incentivize scholars to minimize the harms of social media platforms
arxiv.org/pdf/2601.11507
“these findings suggest industry influence in social media research is extensive, impactful, and often opaque”
A real concern is that this may incentivize scholars to minimize the harms of social media platforms
arxiv.org/pdf/2601.11507
January 19, 2026 at 8:03 PM
Social media research has a conflict of interest problem:
“these findings suggest industry influence in social media research is extensive, impactful, and often opaque”
A real concern is that this may incentivize scholars to minimize the harms of social media platforms
arxiv.org/pdf/2601.11507
“these findings suggest industry influence in social media research is extensive, impactful, and often opaque”
A real concern is that this may incentivize scholars to minimize the harms of social media platforms
arxiv.org/pdf/2601.11507
Reposted by Bastian Jaeger
The kids are alright
statsandsociety.substack.com/p/how-bad-is...
statsandsociety.substack.com/p/how-bad-is...
How bad is the youth life-satisfaction crisis?
Certain groups are hurting, but overall you're creating a moral panic
statsandsociety.substack.com
January 19, 2026 at 12:57 PM
The kids are alright
statsandsociety.substack.com/p/how-bad-is...
statsandsociety.substack.com/p/how-bad-is...
Images of familiar faces generated with Chat-GPT and DALLE are indistinguishable from real photographs
link.springer.com/article/10.1...
link.springer.com/article/10.1...
January 13, 2026 at 2:16 PM
Images of familiar faces generated with Chat-GPT and DALLE are indistinguishable from real photographs
link.springer.com/article/10.1...
link.springer.com/article/10.1...
Reposted by Bastian Jaeger
🌟 Call for Session Proposals 🌟
Don’t miss your chance to shape the agenda for #SIPS2026!
Propose:
✨workshop,
✨hackathon,
✨unconference,
✨lightning talk,
✨roundtables.
Submission Deadlines:
🔹 In-Person (Washington, DC, USA): Jan 23, 2026
🔹 Online: Feb 27, 2026
Details:
Don’t miss your chance to shape the agenda for #SIPS2026!
Propose:
✨workshop,
✨hackathon,
✨unconference,
✨lightning talk,
✨roundtables.
Submission Deadlines:
🔹 In-Person (Washington, DC, USA): Jan 23, 2026
🔹 Online: Feb 27, 2026
Details:
SIPS 2026 – June 8-10, 2026
The submission portal for the conference is now open! We invite researchers to submit their contributions for both online and in-person SIPS 2026. We look forward to your participation!
buff.ly
January 12, 2026 at 5:09 PM
🌟 Call for Session Proposals 🌟
Don’t miss your chance to shape the agenda for #SIPS2026!
Propose:
✨workshop,
✨hackathon,
✨unconference,
✨lightning talk,
✨roundtables.
Submission Deadlines:
🔹 In-Person (Washington, DC, USA): Jan 23, 2026
🔹 Online: Feb 27, 2026
Details:
Don’t miss your chance to shape the agenda for #SIPS2026!
Propose:
✨workshop,
✨hackathon,
✨unconference,
✨lightning talk,
✨roundtables.
Submission Deadlines:
🔹 In-Person (Washington, DC, USA): Jan 23, 2026
🔹 Online: Feb 27, 2026
Details:
Reposted by Bastian Jaeger
Our machine learning competition on forecasting depression is online! We'd love for as many people as possible to participate. Please share in your respective networks — thank you :).
www.staff.universiteitleiden.nl/announcement...
www.staff.universiteitleiden.nl/announcement...
Machine-learning competition on forecasting depression in young adults - Leiden University
After nearly 5 years of work, the research team led by Eiko Fried has finished data collection in the ERC-funded WARN-D project on building a personalised early warning system for depression. But just...
www.staff.universiteitleiden.nl
January 12, 2026 at 12:52 PM
Our machine learning competition on forecasting depression is online! We'd love for as many people as possible to participate. Please share in your respective networks — thank you :).
www.staff.universiteitleiden.nl/announcement...
www.staff.universiteitleiden.nl/announcement...
Reposted by Bastian Jaeger
This NHB article that a I4R fellow reproduced is now retracted and a matters arising has been published. See this thread for more information: bsky.app/profile/jack...
There is now an editor's note for a Nature Human Behaviour article that we are reproducing. This is due to a reproducer submitting a Matters Arising. We would like to take this opportunity to clarify our collaborations with NHB and Psych Science. A 🧵
January 9, 2026 at 1:15 PM
This NHB article that a I4R fellow reproduced is now retracted and a matters arising has been published. See this thread for more information: bsky.app/profile/jack...