Sebastian Hellmann
PostDoc working at TU Munich.
Interested in on computational modelling, decision-making, and confidence.
Cat owner, Ireland lover and brass music fan
- Reposted by Sebastian HellmannHow do priors influence speech processing? Do they enhance expected signals or highlight the unexpected (prediction errors)? @fabianschneider.bsky.social' s work shows: It depends!
- Same sound, different perception: Do expectations change what you hear?👂🧠 We paired faces w topics and played the same ambiguous speech w different faces. The brain sharpened sensory signals toward predictions and showed gated prediction errors at higher levels. Read @plosbiology.org. Blueprint👇
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- Reposted by Sebastian HellmannWell this is exciting! The Department of Psychological & Brain Sciences at Johns Hopkins University (@jhu.edu) invites applications for a full-time tenured or tenure-track faculty member in Cognitive Psychology, in any area and at any rank! Application + more info: apply.interfolio.com/178146
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- Reposted by Sebastian HellmannScience in 2025
- Reposted by Sebastian HellmannStill think this was one of the best power moves of all time www.sciencedirect.com/science/arti...
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- Reposted by Sebastian Hellmann"You can’t reboot the planet if you crash it" | My commentary on Bill Gates' flawed new climate missive for @thebulletin.org: thebulletin.org/2025/10/you-...
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- Reposted by Sebastian HellmannFor your enjoyment (by @jagarikin)
- Reposted by Sebastian HellmannOur new paper is out as a reviewed preprint in @elife.bsky.social! elifesciences.org/reviewed-pre... Congrats to @hashimsat.bsky.social and our amazing collaborators on this great team effort. Special shout-out to @haukeren.bsky.social, who made this possible through his generous support 🙌
- Excited to announce that this is now out in eLife as a reviewed preprint 🚀 doi.org/10.7554/eLif... Huge thanks to the eLife editors, reviewers and our fantastic collaborators: Katharina Wille, @nicoschuck.bsky.social, Matt Nassar, Radoslaw Cichy, Peter Dayan and @rasmusbruckner.bsky.social
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- Reposted by Sebastian HellmannGlad to see my first-year project is out! In two experiments, we manipulated multiple stimulus features in a perception task, yet their effects on confidence and accuracy fell into just two distinct behavioral patterns, offering a way to predict the effects of novel stimulus manipulations. 1/n
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- Reposted by Sebastian HellmannIf 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 HellmannIntroducing 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
- Reposted by Sebastian Hellmann"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
- Reposted by Sebastian HellmannA 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...
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- 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...
- 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...
- Reposted by Sebastian HellmannWe 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
- Reposted by Sebastian HellmannWe 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.
- Reposted by Sebastian Hellmann📢 @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
- Reposted by Sebastian HellmannConfidence 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... 🧵👇
- Reposted by Sebastian Hellmann🚨 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 👇🧵
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- Thanks so much, also for your support and your wisdom. It has been a pleasure to be your Padawan ;)
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- Reposted by Sebastian HellmannPlease 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...
- Reposted by Sebastian Hellmann🎉 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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- Reposted by Sebastian HellmannPostdoc Opportunity in Cognitive Computational Neuroscience 🧠 Join us at TU Dresden (Germany) to model decision-making + brain data using probabilistic modelling 📅 Apply by April 30, 2025 🔗 tud.link/9d2n92 Please share! 🔁 #compneuro #CognitiveNeuroscience #postdoc @bernsteinneuro.bsky.social
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- Reposted by Sebastian HellmannNew from my lab: "Priors for natural image statistics inform confidence in perceptual decisions" We used a natural image statistics approach to investigate the computations underlying perceptual confidence. 🧵 Article: www.sciencedirect.com/science/arti...
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- Reposted by Sebastian HellmannFresh out: a short review article where I give an overview of different ways that across-trial temporal structure is helpful in understanding cognitive models of decision-making osf.io/preprints/ps...
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