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ranimo.bsky.social @ranimo.bsky.social · 10h

⭐PhD in Cognitive/Computational Psychology⭐, Please Share!! Use Reinforcement Learning and Computational Modelling to study how dis/misinformation affects us (with myself +Tali Sharot). Full funding for those eligible for UK home fees. Deadline 10th Nov. @queenmarycbb.bsky.social

Characterising Cognitive Biases Elicited by Misinformation Using Reinforcement Learning at Queen Mary University of London on FindAPhD.com

PhD Project - Characterising Cognitive Biases Elicited by Misinformation Using Reinforcement Learning at Queen Mary University of London, listed on FindAPhD.com

www.findaphd.com

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Reposted by Sebastian Hellmann

Franziska Knolle @franziskaknolle.bsky.social · 10d

If you’re in #Munich 🥨 and curious about decision-making, perception, and cognition through a translational lens, join us for a seminar I’m hosting on Oct 30 with three fantastic speakers: @jkesby.bsky.social (visiting from 🇦🇺), @miguelbengala.bsky.social, and @jacob-lab.bsky.social 🧠💡

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Reposted by Sebastian Hellmann

Nathalie Lawhead @alienmelon.bsky.social · 10d

you heard of running Doom on random gadgets but have you ever heard of…
“Hosting a WebSite on a Disposable Vape”
bogdanthegeek.github.io/blog/project...
this explains how!
((the internet is healing 😌))
#IndieDev

Hosting a WebSite on a Disposable Vape

Someone's trash is another person's web server.

bogdanthegeek.github.io

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Reposted by Sebastian Hellmann

Richard McElreath 🐈‍⬛ @rmcelreath.bsky.social · 11d

Just back from this - I was the misfit invited speaker who knows nothing about psychology. It was really educational for me, expanded my view of theory construction problems in the human sciences.

Lorentz Center @lorentzcenter.bsky.social · 16d

Experts with theoretical traditions, researchers experienced in approaches to theory construction, educators and policymakers work on the first steps toward creating a mature subfield of theoretical psychology. bit.ly/4nLOWoE @annemscheel.bsky.social @bringmannlaura.bsky.social @jmbh.bsky.social

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Reposted by Sebastian Hellmann

Kobe Desender @kobedesender.bsky.social · 13d

Introducing hMFC: A Bayesian hierarchical model of trial-to-trial fluctuations in decision criterion! Now out in @plos.org Comp Bio.
led by Robin Vloeberghs with @anne-urai.bsky.social Scott Linderman

Paper: desenderlab.com/wp-content/u... Thread ↓↓↓

#PsychSciSky #Neuroscience #Neuroskyence

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Reposted by Sebastian Hellmann

Kobe Desender @kobedesender.bsky.social · 13d

"Learning to be confident: How agents learn confidence based on prediction errors"! Now out in @cognitionjournal.bsky.social led by @pierreledenmat.bsky.social

Paper: desenderlab.com/wp-content/u... Thread ↓↓↓

#AcademicSky #PsychSciSky #Neuroscience #Neuroskyence

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Reposted by Sebastian Hellmann

Pascal Mamassian @mamassian.bsky.social · 14d

A nice shift in perceived colour between central and peripheral vision. The fixated disc looks purple while the others look blue.

The effect presumably comes from the absence of S-cones in the fovea.

From Hinnerk Schulz-Hildebrandt:
arxiv.org/pdf/2509.115...

An array of 9 purple discs on a blue background. Figure from Hinnerk Schulz-Hildebrandt.

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Sebastian Hellmann @sehellmann.bsky.social · 15d

Unfortunately, for the variance on the probability scale, the speed up vanishes.

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Sebastian Hellmann @sehellmann.bsky.social · 15d

Thanks for the kind words.
Glad to see that people already account for this in some packages. Not sure whether it helps a lot, but using the direct computations instead of using numerical integration may still speed up things a bit (about 20 times on my machine)

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Reposted by Sebastian Hellmann

Barbara Oberbauer @barbaraoberbauer.bsky.social · Sep 8

Excited to share joint work with Ulf Hahnel and @sgluth.bsky.social on investigating how attribute translations - a widely implemented behavior intervention - lead to more ecological consumer choices. Main results are below, but check out our preprint 👇
www.researchsquare.com/article/rs-7...

Computational Mechanisms of Attribute Translations

Attribute translations, a choice architecture intervention technique aiming to promote behavior change by translating decision-relevant information into more comprehensible and meaningful units for la...

www.researchsquare.com

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Sebastian Hellmann @sehellmann.bsky.social · 28d

The good news: We provide a simple, correct computation that accounts for this variability, ensuring accurate group-level inferences. This fix is crucial for reliable conclusions in all cognitive models with constrained parameters.

Check out the details to improve your hierarchical analyses!

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Sebastian Hellmann @sehellmann.bsky.social · 28d

(e.g. the standard normal CDF) and normal distributions to fit the group-level distribution.
But we cannot simply apply the same transformation to the mean of the real-valued normal distribution to derive the group-level mean on the parameter scale! This ignores individual variability.

A Figure with two panels, demonstrating the transformation of a normally distributed random variable resulting from transforming the values using the standard normal CDF to the interval 0 to 1. The figure shows the discrepancy between the mean of the transformed values and the result from simply transforming the mean of the normal distribution using the standard normal CDF.
The left side shows a normal distribution with low variance, such that the transformed values also show small variance and a symmetrical shape. The mean of the transformed values and the value resulting from transforming the mean directly coincide.
The right side shows a distribution with high variance. Due to the non-linearity of the normal CDF, the distribution of transformed values is non-symmetrical and highly skewed. The mean of the distribution is therefore pulled to the center of the range 0 to 1, compared to the result from directly transforming the mean of the normal distribution.

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Sebastian Hellmann @sehellmann.bsky.social · 28d

If you’re estimating group-level means of constraint parameters, which are fitted with nonlinear transformations, beware that a common approach can produce biased estimates—especially with high individual variability.

For constraint parameters, we often use nonlinear transformations...

Line graphs comparing correct and biased computations for exponential and probit (Φ) transformations in statistical modeling. Colored lines show how the bias changes with different group means and standard deviations.

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Sebastian Hellmann @sehellmann.bsky.social · 28d

For all who use Bayesian hierarchical models, have a look at our new preprint, out now together with @linushof.bsky.social @nunobusch.bsky.social and @thorstenpachur.bsky.social

osf.io/preprints/ps...

osf.io

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Reposted by Sebastian Hellmann

Manikya Alister @manikyaalister.bsky.social · Aug 10

We know that a consensus of opinions is persuasive, but how reliable is this effect across people and types of consensus, and are there any kinds of claims where people care less about what other people think? This is what we tested in our new(ish) paper in @psychscience.bsky.social

Screenshot of the article "How Convincing Is a Crowd? Quantifying the Persuasiveness of a Consensus for Different Individuals and Types of Claims"

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Reposted by Sebastian Hellmann

METR @metr.org · Jul 10

We ran a randomized controlled trial to see how much AI coding tools speed up experienced open-source developers.

The results surprised us: Developers thought they were 20% faster with AI tools, but they were actually 19% slower when they had access to AI than when they didn't.

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Reposted by Sebastian Hellmann

Shawn Rhoads @shawnrhoadsphd.com · Jul 31

📢 @markkho.bsky.social & I are recruiting a joint postdoc interested in computational models of social interaction & mental health

💻 Ideal candidates have experience w/ multi-player web-based experiments & computational modeling

📅 Apps are reviewed on a rolling basis

🔗 apply.interfolio.com/165809

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Reposted by Sebastian Hellmann

Matan Mazor @matanmazor.bsky.social · Jul 23

Confidence in absence as confidence in counterfactual visibility: a CogSci proceedings paper with star MSc student Maya Schipper, is now out on PsyArXiv:

osf.io/preprints/ps...

🧵👇

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Reposted by Sebastian Hellmann

Frank Renkewitz @renkew.bsky.social · Jun 27

🚨 PhD position (75%, TV-L E13) at LMU Munich!
Join our DFG funded META REP project on heterogeneity & replicability in psychology.
Work on meta analysis, simulations, modeling in R/Python.
📅 Apply by July 15
🔗 shorturl.at/939tP
🔗 shorturl.at/2bRLD
👇🧵

Research Associate (m/f/x)

shorturl.at

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Reposted by Sebastian Hellmann

Anne Lutz Fernandez @lutzfernandez.bsky.social · Jun 4

#EduSky A must-read esp. if you use AI tools, are being made to "just try them" at school, or are having your students use them.

Anne Lutz Fernandez @lutzfernandez.bsky.social · Jun 4

Esp but not only if you have or teach children, please read this piece. It's a terrifying example of how generative AI is working RN.

I'll say it again: there is no way for schools to teach students how to use AI ethically and responsibly. That's like saying we can teach them how to use heroin.

Diabolus Ex Machina

This Is Not An Essay

amandaguinzburg.substack.com

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Sebastian Hellmann @sehellmann.bsky.social · Jun 4

Thanks so much, also for your support and your wisdom. It has been a pleasure to be your Padawan ;)

Manuel Rausch @manurausch.bsky.social · Jun 4

Massive congrats @sehellmann.bsky.social for his well-deserved win of the Yearly Price for the best dissertation at the KU!

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Reposted by Sebastian Hellmann

Cognitive Modelling & Decision Neuroscience Lab @cmdn-lab.bsky.social · Jun 4

🧠 Job Alert: Postdoc Position Available!
We're hiring a postdoc as part of the exciting DFG Research Unit on Belief Updating 🔬
🔍 What we're looking for:
Strong quantitative skills & passion for belief updating research
📍 Location: University of Hamburg
⏰ Duration: 2 years, full-time
🔗 Link below

Sebastian Gluth @sgluth.bsky.social · Jun 4

Job altert: Postdoc position (100%, 2 yrs) in our lab (@cmdn-lab.bsky.social) in context with the DFG Research Unit on Belief Updating (www.uni-hamburg.de/ru5389/resea...).

We are looking for people with strong quantitative skills.

Info and application via: www.uni-hamburg.de/stellenangeb...

DFG Research Unit 5389

www.uni-hamburg.de

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Reposted by Sebastian Hellmann

Saloni @scientificdiscovery.dev · May 27

'How is this economics?'
en.m.wikipedia.org/wiki/Hairy_b...

Hairy ball theorem - Wikipedia

en.m.wikipedia.org

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Reposted by Sebastian Hellmann

simine vazire @simine.com · May 23

Please spread the word!

Psych Science is recruiting volunteers to help conduct computational reproducibility checks.
If you have experience writing reproducible analysis scripts in psychology, and want to join the team, please apply!

www.psychologicalscience.org/publications...

Call for Volunteers: Psychological Science REPEAT Network

Are you passionate about ensuring the reproducibility of scientific research? The journal Psychological Science is looking for volunteers to join REPEAT—our new network of computational reproducibilit...

www.psychologicalscience.org

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Reposted by Sebastian Hellmann

Jennifer March @jennamarch.bsky.social · Apr 24

🎉 Thrilled to share the press releases of our study 🎉
English from @elife.bsky.social: elifesciences.org/for-the-pres...
German from @uni-hamburg.de: www.uni-hamburg.de/newsroom/pre...

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