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Researchers seeking the canonical literature, evidence scores, and structured analysis of the Active Inference and Free Energy Principle research field.

Bibliography

Curated references and structured outputs from the Active Inference Meta-Analysis project — 817 papers, 8 hypotheses, 5 topics, 8 subfields, and 71 curated references.

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This page presents the complete structured outputs of the Active Inference Meta-Analysis project — a computational meta-analysis of 817 papers across the Active Inference and Free Energy Principle literature (2005–2026). The project employs multi-source retrieval from arXiv, Semantic Scholar, and OpenAlex; LLM-based assertion extraction into Nanopublications; citation-weighted hypothesis scoring; NMF topic modeling; and subfield classification. All 71 curated references are listed with full bibliographic information and DOI links.

About this bibliography

This page presents the complete structured outputs of the Active Inference Meta-Analysis project. The bibliography includes 71 curated references drawn from the manuscript source, plus the full corpus analysis: field growth metrics, hypothesis evidence scores from LLM-extracted assertions, citation network analysis, NMF topic modeling, subfield classification, corpus coverage statistics, and project quality & reproducibility data. The full BibTeX source, all output data files, and the compiled manuscript are available on GitHub.

Scope and coverage

The bibliography covers foundational work on the Free Energy Principle (Friston 2006, 2010), the Active Inference textbook (Parr, Pezzulo & Friston 2022), methodological advances in discrete and continuous state-space formulations, deep active inference, active inference for robotics and language, and the critical debate around Markov blankets and the FEP's scientific status. It also includes the computational infrastructure references: Nanopublications, knowledge graphs, the Semantic Scholar and OpenAlex platforms, and LLM-based scientific information extraction.

Field overview

Active Inference literature: 817 papers (2005–2026)

The corpus spans two decades of Active Inference and Free Energy Principle research, retrieved from arXiv, Semantic Scholar, and OpenAlex.

Growth metrics

Total papers: 817

CAGR: 20.4%

Doubling time: 2.8 years

Peak year: 2025 (123 papers)

Cumulative (2026): 817

Papers per year

2005 1
2006 0
2007 1
2008 4
2009 4
2010 6
2011 6
2012 12
2013 14
2014 13
2015 18
2016 20
2017 21
2018 32
2019 52
2020 61
2021 90
2022 94
2023 97
2024 99
2025 123
2026 49

Corpus assessment

819 papers indexed and assessed

Coverage and availability statistics for the full literature corpus.

Coverage

Abstracts: 96.5%

Open access: 94.6%

Full-text PDF: 87.8%

Full-text sources

arxiv: 485

publisher: 157

none: 100

repository: 67

openalex: 10

Identifier coverage

doi: 420

arxiv_id: 485

s2_id: 0

openalex_id: 334

Hypothesis evidence

8 core hypotheses evaluated across the literature

Each hypothesis was scored using citation-weighted evidence from LLM-extracted assertions (Nanopublications). Scores reflect the aggregate evidential support found in the corpus.

Morphogenesis

Evidence score 100%

24 supporting assertions

Active Inference Optimality

Evidence score 97%

291 supporting, 6 neutral, 2 contradicting assertions

Predictive Coding

Evidence score 94%

233 supporting, 24 neutral, 1 contradicting assertions

Clinical Utility

Evidence score 93%

23 supporting, 2 neutral assertions

Scalability

Evidence score 85%

108 supporting, 13 neutral assertions

Language & Active Inference

Evidence score 83%

31 supporting, 3 neutral assertions

Markov Blanket Realism

Evidence score 78%

12 supporting, 2 neutral, 4 contradicting assertions

FEP Universality

Evidence score 48%

281 supporting, 429 neutral, 1 contradicting assertions

Subfield distribution

8 domains classified across the corpus

Papers were classified into 8 subfield categories using keyword-based rules applied to titles and abstracts.

Tools & Methods 170
Neuroscience 161
Robotics & Agents 136
Biology / Morphogenesis 135
Formal / Mathematical 64
Philosophy 60
Language 58
Psychiatry / Clinical 33

Total classified assignments: 817

Topic landscape

5 topics extracted via NMF

Non-negative Matrix Factorization (NMF) was applied to TF-IDF vectors of paper titles and abstracts, revealing five thematic clusters in the literature.

Topic 1

energy (0.063), free (0.059), systems (0.05), states (0.048), fep (0.046)

Topic 2

agent (0.107), agents (0.05), environment (0.043), model (0.035), behavior (0.028)

Topic 3

predictive (0.061), cognitive (0.055), brain (0.046), processing (0.038), cognition (0.036)

Topic 4

active (0.06), inference (0.057), decision (0.041), agents (0.039), aif (0.036)

Topic 5

model (0.057), learning (0.052), data (0.036), state (0.033), inference (0.032)

Citation network

817 nodes, 2176 edges, 29323 references

The citation graph was constructed from paper reference lists. PageRank, hub, and authority scores identify the most influential papers in the network.

Network metrics

Nodes: 817

Edges: 2176

Density: 0.003264

Avg degree: 2.7

Full bibliography

71 curated references in 67 sections

Every reference is linked to its DOI or source URL. The BibTeX source is available on GitHub.

Foundational FEP

Active Inference textbook

  • Active Inference: The Free Energy Principle in Mind, Brain, and Behavior Thomas Parr, Giovanni Pezzulo, Karl J Friston (2022) MIT Press

Da Costa et al. on active inference

Sajid et al. review

Smith et al. computational psychiatry

Deep active inference

  • Deep active inference agents using Monte-Carlo methods Zafeirios Fountas, Noor Sajid, Pedro AM Mediano, Karl Friston (2020) Advances in Neural Information Processing Systems, 33, 11662--11675.

Champion et al. tree search

Nanopublications

pymdp

Semantic Scholar

  • The Semantic Scholar Open Data Platform Rodney Kinney, Chloe Anastasiades, Russell Authur, Isabelle Belber, Jonathan Blaschke, Regan Chiang, Jenna Coffey, Arman Feldman, Joshua Gruber, others (2023) arXiv preprint arXiv:2301.10140.

OpenAlex

  • OpenAlex: A fully-open index of scholarly works, authors, venues, institutions, and concepts Jason Priem, Heather Piwowar, Richard Orr (2022) arXiv preprint arXiv:2205.01833.

Markov blanket debate

  • The Emperor's New Markov Blankets Jelle Bruineberg, Krzysztof Dolega, Joe Dewhurst, Manuel Baltieri (2022) Behavioral and Brain Sciences, 45, e183. Cambridge University Press · DOI: 10.1017/S0140525X21002351

Predictive processing

Bayesian mechanics

LLM + KG 2025 systematic reviews

  • Combining Knowledge Graphs and Large Language Models: A Systematic Literature Review Viviana Fernanda Quevedo Tumailli, others (2025) IEEE Access. IEEE
  • Unifying large language models and knowledge graphs: A roadmap Linhao Li, others (2024) IEEE Transactions on Knowledge and Data Engineering. IEEE

2025 tools

Active inference and artificial reasoning (replaces fabricated heins2024active)

AXIOM: AIF agents learning games in minutes

  • AXIOM: Learning to Play Games in Minutes with Expanding Object-Centric Models Conor Heins, Toon Van de Maele, Alexander Tschantz, Hampus Linander, Dimitrije Markovic, Tommaso Salvatori, Corrado Pezzato, Ozan Catal, Ran Wei, Magnus Koudahl, Marco Perin, Karl Friston, Tim Verbelen, Christopher Buckley (2025) arXiv preprint arXiv:2505.24784.

Collective behavior from surprise minimization

  • Collective behavior from surprise minimization Conor Heins, Beren Millidge, Daphne Demekas, Hrishit Basu, Noor Sajid, Karl Friston (2024) Proceedings of the National Academy of Sciences, 121, (17), e2320239121. DOI: 10.1073/pnas.2320239121

Millidge retrospective on Active Inference

The Missing Reward: AIF + LLMs

Morphogenesis and FEP

Active inference for language

Non-negative Matrix Factorization

Vector space model / TF-IDF

Greedy modularity community detection (Clauset-Newman-Moore)

Active inference for robotics

  • Active inference in robotics and artificial agents: Survey and challenges Pablo Lanillos, Cristian Meo, Corrado Pezzato, Ajith Anil Meera, Mohamed Baioumy, Wataru Ohata, Alexander Tschantz, Beren Millidge, Martijn Wisse, Christopher L Buckley, Jun Lenz (2021) arXiv preprint arXiv:2112.01871.

Technological approach to morphogenesis

Active Inference textbook (Friston 2017)

  • Active inference: A process theory Karl Friston, Thomas FitzGerald, Francesco Rigoli, Philipp Schwartenbeck, Giovanni Pezzulo (2017) Neural Computation, 29, (1), 1--49. MIT Press · DOI: 10.1162/NECO_a_00912

Deep active inference survey

  • Understanding the origin of information-seeking exploration in probabilistic objectives for control Beren Millidge, Alexander Tschantz, Christopher L Buckley (2021) arXiv preprint arXiv:2103.06859.

Cpp-AIF: C++ active inference for POMDPs

Deep Active Inference (Millidge)

Predictive coding approximates backprop

Action-oriented predictive processing

Ollama local LLM inference

Prior systematic literature analysis

Visualization standards

Hohwy - The Predictive Mind

  • The Predictive Mind Jakob Hohwy (2013) Oxford University Press · DOI: 10.1093/acprof:oso/9780199682737.001.0001

Ramstead et al. - Answering Schr\"odinger's question

Pezzulo et al. - Active inference and robotics

HITS Centrality

LeCun EBM tutorial

  • A tutorial on energy-based learning Yann LeCun, Sumit Chopra, Raia Hadsell, Marc'Aurelio Ranzato, Fu Jie Huang (2006) Predicting Structured Data, 191--246. MIT Press

Contrastive divergence

Helmholtz machine

  • The Helmholtz machine Peter Dayan, Geoffrey E Hinton, Radford M Neal, Richard S Zemel (1995) Neural Computation, 7, (5), 889--904. MIT Press · DOI: 10.1162/neco.1995.7.5.889

Variational autoencoder

  • Auto-encoding variational Bayes Diederik P Kingma, Max Welling (2014) Proceedings of the 2nd International Conference on Learning Representations (ICLR).

Metacognitive AIF and consciousness

Free Energy Projective Simulation

AIF for smart building energy control

nanopub-js JavaScript library

Publication bias

Falsifiability critique of the FEP

  • Free energy: a user's guide Matteo Colombo, Peggy Seri\`es (2021) Biology & Philosophy, 36, (2), 1--35. Springer · DOI: 10.1007/s10539-021-09788-0

Predictive coding foundational paper: Rao & Ballard 1999

LLM extraction benchmarking survey

  • A survey of scientific information extraction with large language models Tianyi Liang, Weicheng Zhang, Chao Lin, others (2024) arXiv preprint arXiv:2401.01512.

RAG-Knowledge Graph convergence survey

  • A survey on RAG meeting LLMs: towards Retrieval-Augmented large language model Wenqi Fan, Yujuan Ding, Liangbo Ning, Shijie Wang, Hengyun Li, Dawei Yin, Tat-Seng Chua, Qing Li (2024) arXiv preprint arXiv:2405.06211.

Discovery Engine and Knowledge Synthesis

Namjoshi 2026 Textbook

  • Fundamentals of Active Inference: Principles, Algorithms, and Applications of the Free Energy Principle for Engineers Sanjeev V Namjoshi (2026) MIT Press

Namjoshi AIF FEP DB

  • aif-fep-db: A database of publications related to active inference and the free energy principle Sanjeev V Namjoshi (2026)

MDPI Entropy ActiveInference.jl

ResNei: Research Neighbourhood

FAIR Data Principles

Decentralized Science

Cognitive Load Theory

  • Cognitive Load Theory John Sweller, Paul Ayres, Slava Kalyuga (2011) Explorations in the Learning Sciences, Instructional Systems and Performance Technologies. Springer · DOI: 10.1007/978-1-4419-8126-4

Citizen Science

Universal Design for Learning

  • Universal Design for Learning David H. Rose, Anne Meyer (2000) Journal of Special Education Technology, 15, (1), 67--70. DOI: 10.1177/016264340001500108

Article / manuscript describing the template/ system

Software framework (kept as @misc — plainnat.bst does not define @software)

Project quality

Reproducibility and validation

The meta-analysis pipeline is fully tested and validated. All gates pass before any output is published.

Test suite

Tests passed: 558 / 558

Coverage: 94.8%

Pipeline stages: 7

Validation

All checks passed: Yes

Total checks: 4

Pipeline duration: 472.438

Superfici chiave

Bibliography at a glance

Meta-analysis project

The full meta-analysis codebase, pipeline, and manuscript source.

BibTeX source

The canonical references.bib file that drives this page.

Published manuscript

The compiled document with full results, figures, and analysis.

Risorse correlate

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