Search Results for author: Karl J. Friston

Found 14 papers, 2 papers with code

Active Inference and Intentional Behaviour

no code implementations6 Dec 2023 Karl J. Friston, Tommaso Salvatori, Takuya Isomura, Alexander Tschantz, Alex Kiefer, Tim Verbelen, Magnus Koudahl, Aswin Paul, Thomas Parr, Adeel Razi, Brett Kagan, Christopher L. Buckley, Maxwell J. D. Ramstead

First, we simulate the aforementioned in vitro experiments, in which neuronal cultures spontaneously learn to play Pong, by implementing nested, free energy minimising processes.

Bayesian sparsification for deep neural networks with Bayesian model reduction

1 code implementation21 Sep 2023 Dimitrije Marković, Karl J. Friston, Stefan J. Kiebel

Bayesian sparsification for deep learning emerges as a crucial approach, facilitating the design of models that are both computationally efficient and competitive in terms of performance across various deep learning applications.

Variational Inference

Life-inspired Interoceptive Artificial Intelligence for Autonomous and Adaptive Agents

no code implementations12 Sep 2023 Sungwoo Lee, Younghyun Oh, Hyunhoe An, Hyebhin Yoon, Karl J. Friston, Seok Jun Hong, Choong-Wan Woo

Building autonomous --- i. e., choosing goals based on one's needs -- and adaptive -- i. e., surviving in ever-changing environments -- agents has been a holy grail of artificial intelligence (AI).

Linking fast and slow: the case for generative models

no code implementations21 Aug 2023 Johan Medrano, Karl J. Friston, Peter Zeidman

A pervasive challenge in neuroscience is testing whether neuronal connectivity changes over time due to specific causes, such as stimuli, events, or clinical interventions.

Bayesian Inference

Modelling cortical network dynamics

no code implementations3 Jan 2023 Gerald K. Cooray, Richard E. Rosch, Karl J. Friston

However, in contrast to previous work, we derive coupled equations between phase and amplitude dynamics.

Frontal effective connectivity increases with task demands and time on task: a Dynamic Causal Model of electrocorticogram in macaque monkeys

no code implementations21 Feb 2022 Katharina Wegner, Charles R. E. Wilson, Emmanuel Procyk, Karl J. Friston, Frederik Van de Steen, Dimitris A. Pinotsis, Daniele Marinazzo

We apply Dynamic Causal Models to electrocorticogram recordings from two macaque monkeys performing a problem-solving task that engages working memory, and induces time-on-task effects.

Trust as Extended Control: Active Inference and User Feedback During Human-Robot Collaboration

no code implementations22 Apr 2021 Felix Schoeller, Mark Miller, Roy Salomon, Karl J. Friston

This model is based on the cognitive neuroscience of active inference and suggests that, in the context of HRC, trust can be cast in terms of virtual control over an artificial agent.

Active inference: demystified and compared

1 code implementation24 Sep 2019 Noor Sajid, Philip J. Ball, Thomas Parr, Karl J. Friston

In this paper, we provide: 1) an accessible overview of the discrete-state formulation of active inference, highlighting natural behaviors in active inference that are generally engineered in RL; 2) an explicit discrete-state comparison between active inference and RL on an OpenAI gym baseline.

Atari Games OpenAI Gym +2

Neurovascular coupling: insights from multi-modal dynamic causal modelling of fMRI and MEG

no code implementations18 Mar 2019 Amirhossein Jafarian, Vladimir Litvak, Hayriye Cagnan, Karl J. Friston, Peter Zeidman

The ensuing estimates of neuronal parameters are used to generate neuronal drive functions, which model the pre or post synaptic responses to each experimental condition in the fMRI paradigm.

Quantitative Methods

How Robust are Deep Neural Networks?

no code implementations30 Apr 2018 Biswa Sengupta, Karl J. Friston

In this paper, we evaluate the robustness of three recurrent neural networks to tiny perturbations, on three widely used datasets, to argue that high accuracy does not always mean a stable and a robust (to bounded perturbations, adversarial attacks, etc.)

Construct validation of a DCM for resting state fMRI

no code implementations NeuroImage 2014 Adeel Razi, Joshua Kahan, Geraint Rees, Karl J. Friston

We also simulated group differences and compared the ability of spectral and stochastic DCMs to identify these differences.

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