New preprint out 🌿 www.biorxiv.org/content/10.6... With Qingyue Bi, Michelle Moller, Julian Koenig, @peterslab.bsky.social

We @saschafrolich.bsky.social @stefankiebel.bsky.social investigated how habitual- and goal-directed control interact when actions must be made under time pressure. www.nature.com/articles/s44...

Context-dependent interaction between goal-directed and habitual control under time pressure - Communications Psychology

This study investigates the dynamic interplay between habitual and goal-directed control. Using RL and drift-diffusion modelling, we show that these systems interact in a context-dependent manner: hab...

nature.com

Very happy that this is out www.nature.com/articles/s44.... Together with @stefankiebel.bsky.social we show that decision biases in context-dependent decision making, previously attributed to different forms of value normalization, are very well explained by habit-like action repetition.

Action repetition biases choice in context-dependent decision-making - Communications Psychology

This study shows that decision biases previously attributed to value normalization (e.g. relative value learning or range normalization) are better explained by action repetition. Repeating an action ...

nature.com

My paper is out! Computational modeling of error patterns during reward-based learning show evidence that habit learning (value free!) supplements working memory in 7 human data sets. rdcu.be/eQjLN

A habit and working memory model as an alternative account of human reward-based learning

Nature Human Behaviour - In this study, Collins proposes an alternative dual-process (working memory and habit) model of reinforcement learning in humans.

rdcu.be

‼️New preprint‼️ There does not seem to be an effect of ghrelin on risky decision-making in probability discounting. Not in behaviour, underlying computational processes, or neural activity. More details ⬇️

bioRxiv Neuroscience@biorxiv-neursci.bsky.social · 10mo ago

Ghrelin and risky decision-making: No credible evidence for homeostatic state modulation of neural or behavioural effects https://www.biorxiv.org/content/10.1101/2025.10.20.683454v1

Today I will present some of our lab's work at #CCN2025 In two separate studies, we investigated the effect ghrelin, the hunger hormone, on probability discounting. We manipulated ghrelin levels by fasting (study 1) and 1 night if sleep deprivation (study 2) More information and figures on poster 80

2 years ago I built a fMRI preprocessing pipeline for ADNI data. Now I can share the work that was done with it. Riccardo Leone, in the lab of Xenia Kobeleva, used it to model the effects of white matter hyperintensities using whole-brain modelling 🧠💻🧠📈 onlinelibrary.wiley.com/doi/10.1002/...

Beyond Focal Lesions: Dynamical Network Effects of White Matter Hyperintensities

By combining whole-brain neural mass modeling with a virtual-lesioning approach informed by empirical WMH lesion masks, we provide evidence that WMH induce changes in brain dynamics by reducing the g...

onlinelibrary.wiley.com

From our lab!

bioRxiv Neuroscience@biorxiv-neursci.bsky.social · 2y ago

A meta reinforcement learning account of behavioral adaptation to volatility in recurrent neural networks https://www.biorxiv.org/content/10.1101/2024.05.09.593363v1