PSYCH 024: Computational Modelling Approaches to Psychiatry

Psychiatry often deals with processes that cannot be directly observed - beliefs, predictions, learning, and perception. Computational psychiatry offers a way to formalise these processes, translating them into models that can be tested, refined, and understood.In this episode, we explore how mathematical and computational frameworks are used to describe how the brain processes information. Concepts such as prediction, uncertainty, reinforcement learning, and Bayesian inference provide a language for understanding cognition and behaviour.We examine how the brain can be conceptualised as a prediction-generating system - constantly updating its expectations based on incoming information. When these processes are disrupted, perception, belief formation, and decision-making can become distorted.This provides powerful insights into psychiatric conditions. Psychosis, for example, can be framed as a disturbance in how the brain assigns meaning or salience to information. Anxiety may reflect altered processing of uncertainty and threat prediction.Computational models do not replace clinical understanding - they deepen it. They allow psychiatry to move from descriptive frameworks to mechanistic explanations of how the mind works.This chapter represents a shift towards precision - where subjective experience is linked to underlying computational processes.Key Takeaways* Computational psychiatry models how the brain processes information.* Key concepts include prediction, uncertainty, and reinforcement learning.* The brain can be understood as a system that generates and updates expectations.* Psychiatric disorders may reflect disruptions in these computational processes.* Models provide a bridge between subjective experience and biological mechanisms.* Computational approaches enhance mechanistic understanding of mental illness.* These frameworks complement, rather than replace, clinical insight. This is a public episode. If you'd like to discuss this with other subscribers or get access to bonus episodes, visit drmanaankarray.substack.com/subscribe