Head to head
Global Workspace Theory vs Functionalism
Baars’s and Dehaene’s Global Workspace Theory and Functionalism, compared field by field from their entries in the Atlas.
At a glance
- Both belong to the Materialism family in Kuhn's Landscape of Consciousness.
- Both treat consciousness as emergent.
- They give the same kind of answer on AI consciousness, mind uploading and meaning and purpose.
- On life after death, Global Workspace Theory says “No” and Functionalism says “Conditional”.
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The claim
In brief
Global Workspace TheoryThis theory posits that conscious awareness is constituted by specific multi-sensory, multi-cognitive information that achieves brain-wide presence and broad accessibility. It conceptualizes consciousness as an inner 'theater' where this information is globally broadcast, reconciling the limited capacity of momentary conscious content with vast long-term memory access.
FunctionalismFunctionalism posits that mental states are defined by their causal relations to one another, to sensory inputs, and to behavioral outputs, independent of the physical medium (substrate) in which they are realized. The essence of consciousness is determined by how mental states function or operate, rather than by what they are materially composed of.
What consciousness is
Global Workspace TheoryConsciousness is identified as the instantaneous global availability and broad accessibility of specific, integrated information across numerous specialized modular systems in the brain.
FunctionalismMental states are identified as functional states, constituted by their causal relations, roles, results, and outputs, implying they are realizable in any substrate that supports those functions.
Big questions
Can AI be conscious?Both agree
Global Workspace TheoryYesSince the theory defines consciousness in terms of information-processing computations and architectures, and proponents suggest novel machine architectures could be based on these computations, AI consciousness is possible in principle.
FunctionalismYesFunctionalism holds that consciousness is based on function, not biology. If the correct functions can be realized computationally in non-biological substrates, AI consciousness is possible in principle and certain if Materialism is true.
Global Workspace TheoryNoConsciousness is understood as being entirely dependent on specific, complex biological brain processes, which cease upon biological death.
FunctionalismConditionalAs a physicalist theory, consciousness is tied to the substrate. Survival beyond death of the biological body is only possible if the functional mental state can be successfully transferred (uploaded) to a new, continuing substrate (virtual immortality).
Could a mind be uploaded?Both agree
Global Workspace TheoryYesIf consciousness is wholly explained by the computational organization and information flow of the brain, a perfect duplication or uploading of these mechanisms into a non-biological substrate should preserve the first-person mental self.
FunctionalismLikelyFunctionalism serves as the theoretical basis for virtual immortality. If the functional role of the mental self can be perfectly duplicated and uploaded to a new medium, the first-person mental self is preserved.
Does it give life meaning?Both agree
Global Workspace TheoryHumanistic onlyAs a Materialist/Neurobiological theory, it does not mandate ultimate cosmic meaning or purpose, but consciousness provides essential functions (like memory reconciliation and integrated awareness) that underpin human agency and self-created value.
FunctionalismHumanistic onlyFunctionalism describes the mechanism by which mind/consciousness operates within a physical world, providing capacities for agency and reflection, but offers no rationale for ultimate cosmic meaning or teleology, aligning with the general stance of Materialism.
Nature of mind
Ontology
Global Workspace TheoryPhysicalism
FunctionalismPhysicalism (broadly, agnostic to substance). The theory is classified under Materialism, but it is metaphysically agnostic regarding nonphysical substances, focusing primarily on the functional description of mental states.
Mind and body
Global Workspace TheoryIdentity/Correlation. The mind (conscious awareness) is identified as, or strongly correlates with, the specific, biologically realized processes of global information broadcasting in the brain.
FunctionalismMental states are functional states identical to the functional roles that are realized or instantiated in a physical substrate, leading to 'functional state identity theses'.
Fundamental or emergent
Global Workspace TheoryEmergent
FunctionalismEmergent. Consciousness arises from the functional organization realized by a sufficiently complex substrate (like neural tissue or computer chips).
Qualia
Global Workspace TheoryPhenomenal experience (qualia) is accounted for by proposing a strictly biological mechanism for conscious awareness. Qualia correspond to the content of the integrated, reportable multi-sensory information that is broadly accessible within the global workspace.
FunctionalismThe theory traditionally struggles to account for phenomenal qualia, often addressing them by asserting that the qualitative feel is entirely exhausted by the functional role, or by coupling with representational theories.
How it works
Mechanism
Global Workspace TheoryGlobal broadcasting and accessibility of information, allowing a single coherent content to be made available to many specialized, unconscious modules simultaneously.
FunctionalismThe principle of multiple realizability, stating that mental state realization is independent of the physical substrate, contingent only upon the required function being instantiated.
Where it is
Global Workspace TheoryBrain-wide, encompassing widespread areas, particularly associated with frontal and parietal regions (often characterized as a 'front of the head' theory in contrast to 'back of the head' theories like IIT).
FunctionalismDistributed wherever the functional organization is successfully realized, regardless of whether the substrate is neural tissue or hardwired computing components.
What it does
Global Workspace TheoryGlobal broadcasting constitutes consciousness. Functionally, it allows for flexible control and reconciliation between limited momentary conscious content and long-term memory resources.
FunctionalismFunctions, roles, and outputs are dispositive. Mental states are causally effective because they are defined by their causal relations within the system (functional role).
Evidence and criticism
Testability
Global Workspace TheoryEmpirically testable
FunctionalismConceptually and empirically testable. Thought experiments (like substrate replacement) probe its conceptual limits, and computational realization (AI) tests its empirical application.
Tests so far
Global Workspace TheoryNeuroimaging and computer modeling studies used to investigate its claims. It is implicitly subject to the 'neurogeographic' debate contrasting 'front of the head' theories with posterior theories.
FunctionalismThe silicon chip replacement thought experiment is used conceptually to test whether phenomenal consciousness is preserved when the functional role is maintained across a change in substrate.
Criticisms
Global Workspace TheoryCriticized for focusing on 'access' rather than genuine phenomenal experience, exemplified by the critique that the theory is 'all about access but not about seeing'. It faces tension regarding whether global broadcasting is necessary or merely a consequence of consciousness.
FunctionalismIt is criticized heavily for failing to account for phenomenal consciousness (qualia) by describing only the functional role, leading to the 'hard problem' challenge that functional roles may not exhaust the nature of conscious experience.
Sources
Key sources
Global Workspace Theory
- A Cognitive Theory of Consciousness (1988)
- In the Theater of Consciousness (1997)
- Towards a cognitive neuroscience of consciousness: basic evidence and a workspace framework, Dehaene and Naccache (2000)
Functionalism
- What is functionalism? (N. Block) (1980)
- What Is Functionalism? Consciousness, Function, and Representation (N. Block) (2007)
- Functionalism (J. Levin) (2023)