Johannes Algermissen
@johalgermissen.bsky.social
660 followers 510 following 51 posts
Postdoc UniOxford with MKFlugge, past PhD DondersInst, into decision-making, learning, ultrasound stimulation, improving psychology & neuroscience. he/him
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johalgermissen.bsky.social
I'm very happy to announce that I'll move to the Zurich Center for Neuroeconomics (ZNE) @econ.uzh.ch to work with @ccruff.bsky.social and many others in September, funded by personal postdoc grant by the @snsf.ch (Swiss version of Marie-Curie) and the UZH Research Priority Program URPP Adabd!
🎉⛰️🧀🍫🎉
Reposted by Johannes Algermissen
johnwkrakauer.bsky.social
First shot across the bow from ongoing project with Jake.
quiltydunn.bsky.social
New publication forthcoming in BBS, co-authored with John Krakauer: a commentary on @smfleming.bsky.social & @matthiasmichel.bsky.social's groundbreaking target article.

We critique widespread assumptions in cognitive neuroscience about the role of internal models in implicit cognition. (1/7)
Reposted by Johannes Algermissen
eikofried.bsky.social
Had missed this absolutely brilliant paper. They take a widely used social media addiction scale & replace 'social media' with 'friends'. The resulting scale has great psychometric properties & 69% of people have friend addictions.

link.springer.com/article/10.3...
Development of an Offline-Friend Addiction Questionnaire (O-FAQ): Are most people really social addicts? - Behavior Research Methods
A growing number of self-report measures aim to define interactions with social media in a pathological behavior framework, often using terminology focused on identifying those who are ‘addicted’ to engaging with others online. Specifically, measures of ‘social media addiction’ focus on motivations for online social information seeking, which could relate to motivations for offline social information seeking. However, it could be the case that these same measures could reveal a pattern of friend addiction in general. This study develops the Offline-Friend Addiction Questionnaire (O-FAQ) by re-wording items from highly cited pathological social media use scales to reflect “spending time with friends”. Our methodology for validation follows the current literature precedent in the development of social media ‘addiction’ scales. The O-FAQ had a three-factor solution in an exploratory sample of N = 807 and these factors were stable in a 4-week retest (r = .72 to .86) and was validated against personality traits, and risk-taking behavior, in conceptually plausible directions. Using the same polythetic classification techniques as pathological social media use studies, we were able to classify 69% of our sample as addicted to spending time with their friends. The discussion of our satirical research is a critical reflection on the role of measurement and human sociality in social media research. We question the extent to which connecting with others can be considered an ‘addiction’ and discuss issues concerning the validation of new ‘addiction’ measures without relevant medical constructs. Readers should approach our measure with a level of skepticism that should be afforded to current social media addiction measures.
link.springer.com
Reposted by Johannes Algermissen
tsrauf.bsky.social
Life satisfaction mostly declines with age. Previous findings (esp. the famous U-shaped age-SWB trajectory) were artifacts of misspecified models. doi.org/10.1093/esr/...
Reposted by Johannes Algermissen
matthieu-mx.bsky.social
1/ Why are we so easily distracted? 🧠 In our new EEG preprint w/ Henry Jones, @monicarosenb.bsky.social and @edvogel.bsky.social we show that distractibility is associated w/ reduced neural connectivity — and can be predicted from EEG with ~80% accuracy using machine learning.
Reposted by Johannes Algermissen
chazfirestone.bsky.social
Our new paper explores an analogy between representations of objects and representations of events, finding that similar illusions arise for both! Check it out 👇
Screenshot from a figure of the paper, depicting object segmentation, event segmentation, and illusions created by each
Reposted by Johannes Algermissen
dobyrahnev.bsky.social
Do you ever compute d' in detection tasks? Because of unequal variance, d' is biased in such tasks and you can't fix the bias without confidence ratings. In this preprint led by Kiyo Miyoshi and @hakwan.bsky.social, we show how to use RT instead of confidence to fix the d'.

osf.io/preprints/ps...
OSF
osf.io
Reposted by Johannes Algermissen
mamassian.bsky.social
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.
Reposted by Johannes Algermissen
Reposted by Johannes Algermissen
malcolmgcampbell.bsky.social
🚨Our preprint is online!🚨

www.biorxiv.org/content/10.1...

How do #dopamine neurons perform the key calculations in reinforcement #learning?

Read on to find out more! 🧵
Reposted by Johannes Algermissen
saurabhbedi.bsky.social
📢 Preprint out! biorxiv.org/content/10.1... What gives rise to probability weighting, a cornerstone of Prospect Theory?
We show it comes from the natural boundedness of probabilities + cognitive noise. Adding boundaries adds multiple distortions, across risky choice & perception.
Probability weighting arises from boundary repulsions of cognitive noise
In both risky choice and perception, people overweight small and underweight large probabilities. While prospect theory models this with a probability weighting function, and Bayesian noisy coding mod...
biorxiv.org
Reposted by Johannes Algermissen
rssmith.bsky.social
Big congrats to Marishka on this. I know how much time and effort went into it. Really happy to see it out! For those interested, she replicated prior longitudinal results using an approach-avoidance conflict task and showed how model parameters afforded out-of-sample clinical prediction.
cpsyjournal.bsky.social
New paper in CPsy - 'Computational Mechanisms of Approach-Avoidance Conflict Predictively Differentiate Between Affective and Substance Use Disorders' from Marishka Mehta and the group of @rssmith.bsky.social
doi.org/10.5334/cpsy...
Computational Mechanisms of Approach-Avoidance Conflict Predictively Differentiate Between Affective and Substance Use Disorders | Computational Psychiatry
doi.org
Reposted by Johannes Algermissen
Reposted by Johannes Algermissen
actlab.bsky.social
Thrilled that our new review "Motor Working Memory" is now in press at TiCS!

@cp-trendscognsci.bsky.social
@cellpress.bsky.social

By me +
Hanna Hillman

We argue that a dedicated research program on 'working memory for movements' is long overdue

Link: authors.elsevier.com/a/1lmMX4sIRv...
Reposted by Johannes Algermissen
pf-hitchcock.bsky.social
Now out in JEP: General, "How working memory and reinforcement learning interact when avoiding punishment and pursuing reward concurrently"

psycnet.apa.org/record/2026-...

Preprint with final version: osf.io/preprints/ps...

1/n
Reposted by Johannes Algermissen
martinhebart.bsky.social
I wanted to add some thoughts to this excellent blog post, not detailed, maybe wrong, maybe useful:
1. Unique variance is easy to interpret as a lower bound of what a variable explains (the upper bound being either what the variable explains alone or what the other variables cannot explain uniquely)
diedrichsenjorn.bsky.social
Variance partitioning is used to quantify the overlap of two models. Over the years, I have found that this can be a very confusing and misleading concept. So we finally we decided to write a short blog to explain why.
@martinhebart.bsky.social @gallantlab.org
diedrichsenlab.org/BrainDataSci...
Reposted by Johannes Algermissen
Reposted by Johannes Algermissen
grrrck.xyz
ggplot2 4.0.0 is out and the new `paper`, `ink`, `accent` theme variables look super cool! Just pick 2-3 colors 🎨 to make your plots look great! I'm excited to hook this up to brand.yml 😉
A ggplot2 plot showing a classic `mpg` scatter plot. The code uses `theme_gray()` with `paper = "cornstalk"` for a light yellow background, `ink = "navy"` for navy blue text and points, and `accent = "tomato"` which is applied to the smoothing line created with `geom_smooth()`
Reposted by Johannes Algermissen
hritz.bsky.social
Awesome new preprint from @jasonleng.bsky.social!

Deadlines in decision making often truncate too-slow responses. Failing to account for these omissions can (severely) bias your DDM parameter estimates.

They offer a great solution to correct for this issue.

doi.org/10.31234/osf...
Reposted by Johannes Algermissen
Reposted by Johannes Algermissen
bensaunders.bsky.social
Excited to share this update to our paper investigating the role of superior colliculus inputs to the ventral midbrain in learning and movement. Studies led by the amazing Dr. @carlipoisson.bsky.social www.biorxiv.org/content/10.1...
Reposted by Johannes Algermissen
ngaspelin.bsky.social
New paper from my lab testing how the breadth of attentional focus influences visual distraction by salient stimuli. Across six experiments, we find no ERP or behavioral evidence in support of the attentional window account.

Read about it on my blog:
gaspelinblog.wordpress.com/2025/09/08/t...
Testing the Attentional Window Account of Capture
Ma, X., Luck, S.J., & Gaspelin, N., (in press). Ignoring salient distractors inside and outside the attentional window. Journal of Cognitive Neuroscience. [PDF] Many studies have shown that ind…
gaspelinblog.wordpress.com
Reposted by Johannes Algermissen
isabellehoxha.bsky.social
Ever wondered why you keep going to that restaurant with stale fries? Is it because you went often in the past (perseveration) or because you remember past good experiences better (positivity bias)? Our study out in PNAS investigates the normative basis for these biases www.pnas.org/doi/10.1073/...
Evolving choice hysteresis in reinforcement learning: Comparing the adaptive value of positivity bias and gradual perseveration | PNAS
The tendency to repeat past choices more often than expected from the history of outcomes has been repeatedly empirically observed in reinforcement...
www.pnas.org
Reposted by Johannes Algermissen
nicoschuck.bsky.social
I want to do a session on principles of designing scientific figures with my lab. Any recommendation for good online material? #PsychSciSky #neuroskyence #Neuroimaging
Reposted by Johannes Algermissen
markkho.bsky.social
The TiCS issue featuring our paper on "A timeline of cognitive costs in decision-making" is now available online 😄

Honored to have been a part of this awesome interdisciplinary mega-collab led by Christin Schulze (UNSW Sydney)

www.cell.com/trends/cogni...
A timeline of cognitive costs in decision-making
Recent research from economics, psychology, cognitive science, computer science, and marketing is increasingly interested in the idea that people face cognitive costs when making decisions. Reviewing ...
www.cell.com