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integrated information theory
Also known as: integrated information, phi, Φ, Integrated Information Theory
Facts (52)
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A Synergistic Workspace for Human Consciousness Revealed by ... elifesciences.org 33 facts
procedureThe researchers computed integrated information between each pair of BOLD signal timeseries for each subject, resulting in a 454-by-454 matrix of integrated information between brain regions.
claimIncreases in integrated information during anaesthesia appear to coincide with broadcaster nodes of the synergistic workspace.
claimThe authors' measure of integrated information between pairs of brain regions does not measure the integrated information of the brain as a whole, as formally specified in Integrated Information Theory (IIT).
referenceThe original 'whole-minus-sum' Φ measure of integrated information, introduced by Balduzzi and Tononi, did not show consistent reductions during loss of consciousness.
claimThe Integrated Information Decomposition framework allows for the identification of information-theoretic components of integrated information, providing insights into human consciousness that were not captured by standard functional connectivity methods.
claimThe authors' revised measure of integrated information is based on IIT 2.0 due to computational tractability, making it conceptually distinct from the definitions of integrated information found in IIT 3.0 and IIT 4.0.
claimThe observed increases in integrated information were not robust, as no specific brain region consistently showed increases in integrated information across different analytic approaches.
claimIntegrated Information (Φ) is composed of synergistic information, unique information transferred between variables, and the subtraction of redundancy, which explains why Φ can be negative in redundancy-dominated systems.
measurementPropofol anesthesia caused significant changes in integrated information between brain regions when compared with pre-anaesthetic wakefulness (p < 0.001) and post-anaesthetic recovery (p < 0.001).
measurementAnalysis based on the ΦR measure revealed a widespread reorganization of integrated information throughout the brain when comparing awake volunteers against patients with chronic disorders of consciousness (p < 0.001).
referenceThe paper 'Consciousness as Integrated Information' was published in The Biological Bulletin in 2008.
claimWhen consciousness is lost, several nodes of the synergistic global workspace become disconnected from each other in terms of integrated information, particularly between anterior and posterior brain regions.
procedureThe researchers analyzed consciousness-related changes in integrated information by treating the 454-by-454 matrix as an undirected network and applying the Network Based Statistic correction for multiple comparisons.
claimA previous study using ECoG recordings in non-human primates demonstrated a broadband shift away from synergy during anaesthesia, which aligns with the authors' observed reduction in ΦR (integrated information).
claimThe study authors observed concomitant increases of integrated information during anaesthetic-induced loss of consciousness, which they hypothesize might reflect compensatory attempts.
referenceThe study assessed integrated information using two metrics: the 'whole-minus-sum Φ' measure introduced by Balduzzi and Tononi, and the 'revised Φ' (ΦR) measure introduced by Mediano, Rosas, and colleagues.
referenceThe paper 'Measuring integrated information: Comparison of candidate measures in theory and simulation' compares different candidate measures for quantifying integrated information in both theoretical and simulation contexts.
referenceThe article 'Practical Measures of Integrated Information for Time-Series Data' was published in PLoS Computational Biology in 2011.
perspectiveThe researchers hypothesized that brain regions supporting consciousness should show reductions in integrated information during loss of consciousness, regardless of the cause, and that this information should be restored when consciousness returns.
measurementThe sum of F-scores associated with significant edges in the study's analysis of integrated information was −25.37, indicating an overall balance in favour of reduced integrated information.
referenceThe paper 'Integrated information in discrete dynamical systems: Motivation and theoretical framework' was published in PLoS Computational Biology in 2008.
claimIntegrated information in the human brain is reduced during anaesthesia compared to wakefulness.
claimResearchers identified common changes across three states of consciousness (Disorders of Consciousness, anaesthesia, and wakefulness/recovery) by defining edges in terms of ΦR (Integrated Information) that consistently increased or decreased across specific comparisons: Disorders of Consciousness versus control, anaesthesia versus wakefulness, and anaesthesia versus post-anaesthetic recovery.
claimThe observed decreases in integrated information were robust to the use of different analytic approaches, such as using a different parcellation or different Network-Based Statistic (NBS) threshold.
referenceThe article 'Improved Measures of Integrated Information' was published in PLoS Computational Biology in 2016.
claimIntegrated Information Theory (IIT) predicts that the loss of consciousness corresponds to reductions in integrated information.
claimThe authors of 'A Synergistic Workspace for Human Consciousness Revealed by...' found that brain regions exhibiting consciousness-specific reductions in integrated information correspond to major nodes of the synergistic global workspace.
claimThe 'revised' measure of integrated information, ΦR, is empirically valid and theoretically sound for detecting consciousness loss.
claimThe 'revised Φ' (ΦR) measure is demonstrably non-negative, which overcomes a major conceptual limitation of the original formulation of integrated information.
referenceThe paper 'Quantifying causal emergence shows that macro can beat micro' by Hoel et al. (2013) demonstrates that macro-scale systems can exhibit more causal power than their micro-scale components, a concept relevant to understanding integrated information across scales.
referenceThe article 'The phi measure of integrated information is not well-defined for general physical systems' was published in the Journal of Consciousness Studies.
claimIntegrated Information Theory (IIT) predicts that integrated information decreases during the loss of consciousness.
claimReductions in integrated information (ΦR) associated with the loss of consciousness occur specifically within the default mode network.
Non-physicalist Theories of Consciousness cambridge.org Dec 20, 2023 4 facts
claimAccording to the Integrated Information Theory, everything that has maximal integrated information is conscious, and the level of consciousness corresponds to the level of integrated information.
claimThe human brain contains very high levels of Φ (integrated information), particularly in areas considered necessary for consciousness, but small amounts of Φ can also be found at the level of fundamental physics, such as in protons and neutrons.
claimIntegrated Information Theory (IIT) implies panpsychism, or a position very close to it, because it suggests that particles possess a small amount of consciousness unless they are part of a larger system with higher integrated information (Φ), such as a brain, cell, or molecule, which would then be the conscious entity.
formulaA system has maximal integrated information (Φ) if it possesses more integrated information than any overlapping system, including its own parts or any larger system of which it is a part.
Hard problem of consciousness - Wikipedia en.wikipedia.org 3 facts
referenceHedda Hassel Mørch published an article titled 'The Integrated Information Theory of Consciousness' in Philosophy Now in 2017.
perspectiveMichael Cerullo argues that Integrated information theory explains what he calls the 'Pretty Hard Problem'—methodically inferring which physical systems are conscious—but does not solve David Chalmers' hard problem of consciousness because it does not explain why integrated information generates or is consciousness.
claimIntegrated information theory proposes an identity between consciousness and integrated information, with integrated information denoted as Φ and defined mathematically.
Consciousness (Stanford Encyclopedia of Philosophy/Fall 2025 ... plato.stanford.edu Jun 18, 2004 2 facts
claimIntegrated Information Theory (IIT) identifies consciousness with integrated information, which can exist in varying degrees.
claimAccording to Integrated Information Theory, simple devices like a single photo diode possess some degree of integrated information and therefore a limited degree of consciousness.
Panpsychism - Wikipedia en.wikipedia.org 2 facts
claimAccording to Integrated Information Theory, even basic objects or substances possess a nonzero degree of integrated information (Φ).
measurementGiulio Tononi created a measurement for integrated information called phi (Φ), which he uses to measure consciousness based on the belief that consciousness is equivalent to integrated information.
The evolution of human-type consciousness – a by-product of ... frontiersin.org 1 fact
referenceThe article 'The evolution of human-type consciousness – a by-product of mammalian innovation mechanism – a preliminary hypothesis' cites Tononi (2008), which proposes consciousness as integrated information.
Six Theories of Consciousness - Mind Matters mindmatters.ai Mar 2, 2026 1 fact
claimIntegrated Information Theory (IIT) is a mathematically founded emergence model that claims consciousness is identical to measurable integrated information (Φ).
The Problem of Hard and Easy Problems cambridge.org Mar 31, 2023 1 fact
perspectiveTononi and Koch (2015) hold the view that consciousness is equivalent to integrated information, and therefore would argue that claiming an explanation of information discrimination and integration leaves consciousness unexplained is a conceptual mistake.
[2510.09858] AI and Consciousness - arXiv arxiv.org 1 fact
referenceThe paper 'AI and Consciousness' by Eric Schwitzgebel includes chapters covering topics such as the Turing Test, the Chinese Room, Global Workspace Theories, Higher Order Theories, Integrated Information, and the question of whether biological substrate matters for consciousness.
Psychology and Cognitive Science on Consciousness klinikong.com 1 fact
claimIntegrated Information Theory posits that consciousness corresponds to the amount of integrated information in a system.
Psychedelics and Consciousness: Distinctions, Demarcations, and ... ouci.dntb.gov.ua 1 fact
referenceTononi published 'Consciousness as integrated information: a provisional manifesto' in the Biological Bulletin, which outlines the theory of consciousness as integrated information.
Adversarial testing of global neuronal workspace and ... - Nature nature.com Apr 30, 2025 1 fact
claimIntegrated Information Theory (IIT) proposes that consciousness is the intrinsic ability of a neuronal network to influence itself, determined by the amount of maximally irreducible integrated information (phi) supported by a network in a state.
In defense of scientifically and philosophically (not politically ... blog.apaonline.org Nov 14, 2023 1 fact
claimIntegrated Information Theory (IIT) postulates that the physical substrate of consciousness exhibits a maximally irreducible cause-effect structure associated with integrated information.