Head to head
Global Workspace Theory vs Orch OR
Baars’s and Dehaene’s Global Workspace Theory and Penrose-Hameroff’s Orchestrated Objective Reduction, compared field by field from their entries in the Atlas.
At a glance
- Global Workspace Theory belongs to the Materialism family in Kuhn's Landscape of Consciousness, Orch OR to Quantum & Dimensions.
- Both treat consciousness as emergent.
- On AI consciousness, Global Workspace Theory says “Yes” and Orch OR says “No”.
- On life after death, Global Workspace Theory says “No” and Orch OR says “Possible”.
- On mind uploading, Global Workspace Theory says “Yes” and Orch OR says “Conditional”.
- On meaning and purpose, Global Workspace Theory says “Humanistic only” and Orch OR says “Cosmic/Ultimate”.
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Quantum & Dimensions
Penrose-Hameroff’s Orchestrated Objective Reduction
Roger Penrose, Stuart Hameroff
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.
Orch ORThis theory posits that consciousness arises from non-computational, gravitation-mediated objective reduction (OR) of quantum superpositions occurring within the protein structures (microtubules) inside brain neurons. This process, termed Orchestrated Objective Reduction (Orch OR), bridges the gap between quantum mechanics and classical reality to produce phenomenal experience.
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.
Orch ORConsciousness is identified as a non-computational physical process—the specific orchestration of gravitation-mediated objective reduction of quantum states linked to the fine-scale structure of spacetime geometry. Proto-conscious moments are fundamental and ubiquitous in the universe.
Big questions
Can AI be conscious?Differ
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.
Orch ORNoConsciousness is fundamentally non-computational and relies on specific biological quantum processes (Orch OR in microtubules); digital simulation cannot replicate true sentience.
Global Workspace TheoryNoConsciousness is understood as being entirely dependent on specific, complex biological brain processes, which cease upon biological death.
Orch ORPossibleAs a non-local quantum process in spacetime geometry, consciousness provides a potentially plausible mechanism for phenomena like near-death experiences, the afterlife, and reincarnation.
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.
Orch ORConditionalMind uploading requires recreating consciousness in an artificial medium (e.g., carbon nanotubes) that possesses the necessary quantum physical properties to sustain and orchestrate objective reduction events.
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.
Orch ORCosmic/UltimateProto-conscious moments are fundamental and ubiquitous, linking consciousness to the fine-scale structure of reality, suggesting inherent cosmic relevance and possibly enabling evolution itself.
Nature of mind
Ontology
Global Workspace TheoryPhysicalism
Orch ORQuantum Theory (Non-computational Physicalism / Proto-panpsychism)
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.
Orch ORConsciousness is non-computational physics. The brain's microtubules act as a mechanism to orchestrate proto-conscious quantum activity into coherent, rich conscious experiences, requiring a physics beyond current understanding.
Fundamental or emergent
Global Workspace TheoryEmergent
Orch OREmergent/Primitive (Hybrid)
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.
Orch ORRich conscious experience (qualia) arises when orchestrated objective reduction occurs in neuronal microtubules, connecting the quantum information processing to the fundamental structure of spacetime geometry.
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.
Orch OROrchestrated Objective Reduction (Orch OR), where non-computational, instantaneous quantum state collapse is leveraged by coherent quantum activity sustained within microtubule lattices.
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).
Orch ORLocalized within neuronal microtubules, particularly in the brain, but fundamentally drawing upon ubiquitous proto-conscious properties throughout the universe.
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.
Orch ORConsciousness provides real-time conscious causal action through non-computable objective reduction events, potentially linked to the fundamental mechanisms of free will and choice.
Evidence and criticism
Testability
Global Workspace TheoryEmpirically testable
Orch ORTheoretically testable; versions involving collapse dynamics can, in principle, be tested with quantum computers, though current tests are rudimentary.
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.
Orch ORStudies showing that general anesthetics, psychedelics, and antidepressants interact with microtubules.,Experiments aimed at testing quantum coherence maintenance in biological systems (e.g., tubulin studies).,Testing theoretical versions by combining IIT and collapse dynamics.
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.
Orch ORThe main tension is the challenge of maintaining quantum coherence for biological timescales in the hot, wet environment of the brain (environmental decoherence). The theory also requires non-existent physics (quantum gravity).
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)
Orch OR
- Shadows of the Mind: A Search for the Missing Science of Consciousness, Roger Penrose (1996)
- Conscious., Microtub. ‘Orch OR’, Stuart Hameroff (2014)
- Consciousness & new physics, Roger Penrose (2023)