Steven
@stevengeysen.bsky.social
(he/him)
PhD student at University of Cologne, Germany
Cognitive psychology - (risky) decision-making
PhD student at University of Cologne, Germany
Cognitive psychology - (risky) decision-making
Pinned
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
‼️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 ⬇️
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 ⬇️
‼️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 ⬇️
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 ⬇️
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
October 22, 2025 at 8:11 AM
‼️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 ⬇️
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 ⬇️
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
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
August 13, 2025 at 7:19 AM
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
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/...
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
December 5, 2024 at 8:42 AM
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/...
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/...
From our lab!
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
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
Natural environments often exhibit various degrees of volatility, ranging from slowly changing to ra
www.biorxiv.org
May 10, 2024 at 6:50 AM
From our lab!