A neurocomputational model of observation-based decision making with a focus on trust

Hassanejad Nazir, A.; Hellgren Kotaleski, J.; Liljenström, H.

doi:10.64898/2026.03.24.713845

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bioRxiv · 10.64898/2026.03.24.713845

A neurocomputational model of observation-based decision making with a focus on trust

Hassanejad Nazir, A.·Hellgren Kotaleski, J.·Liljenström, H.

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Abstract

As social beings, humans make decisions partly based on social interaction. Observing the behavior of others can lead to learning from and about them, potentially increasing trust and prompting trust-based behavioral changes. Observation-based decision making involves different neural structures. The orbitofrontal cortex (OFC) and lateral prefrontal cortex (LPFC) are known as neural structures mainly involved in processing emotional and cognitive decision values, respectively, while the anterior cingulate cortex (ACC) plays a pivotal role as a social hub, integrating the afferent expectancy signals from OFC and LPFC. This paper presents a neurocomputational model of the interplay between observational learning and trust, as well as their role in individual decision-making. Our model elucidates and predicts the emotional and rational behavioral changes of an individual influenced by observing the action-outcome association of an alleged expert. We have modeled the neurodynamics of three cortical structures (OFC, LPFC, and ACC) and their interactions, where the neural oscillatory properties, modeled with Dynamic Bayesian Probability, represent the observers attitude towards the expert and the decision options. As an example of an everyday behavioral situation related to climate change, we use the choice of transportation between home and work. The EEG-like simulation outputs from our model represent the presumed brain activity of an individual making such a choice, assuming the decision-maker is exposed to social information.

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Hassanejad Nazir, A., Hellgren Kotaleski, J., Liljenström, H.. 2026-03-26. A neurocomputational model of observation-based decision making with a focus on trust. https://doi.org/10.64898/2026.03.24.713845

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