Head to head
Chalmers’s Panpsychism vs Orch OR
Chalmers’s Panpsychism and Penrose-Hameroff’s Orchestrated Objective Reduction, compared field by field from their entries in the Atlas.
At a glance
- Chalmers’s Panpsychism belongs to the Panpsychism family in Kuhn's Landscape of Consciousness, Orch OR to Quantum & Dimensions.
- Chalmers’s Panpsychism treats consciousness as fundamental; Orch OR treats it as emergent.
- On AI consciousness, Chalmers’s Panpsychism says “Conditional” and Orch OR says “No”.
- On life after death, Chalmers’s Panpsychism says “Uncertain” and Orch OR says “Possible”.
- On mind uploading, Chalmers’s Panpsychism says “Uncertain” and Orch OR says “Conditional”.
- On meaning and purpose, Chalmers’s Panpsychism says “Uncertain” and Orch OR says “Cosmic/Ultimate”.
Add more theories to this comparisonCompare other theories
Quantum & Dimensions
Penrose-Hameroff’s Orchestrated Objective Reduction
Roger Penrose, Stuart Hameroff
The claim
In brief
Chalmers’s PanpsychismDavid Chalmers argues that consciousness may be a fundamental feature of physical reality, carried by the intrinsic properties of its most basic entities. He treats panpsychism, and its cousin panprotopsychism, as a synthesis of materialism and dualism, and holds that it would become the most promising answer to the mind-body problem if someone solves the combination problem.
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
Chalmers’s PanpsychismChalmers identifies consciousness with the intrinsic properties of fundamental physical entities, the categorical bases of the dispositions that physics describes. Physics tells us what basic entities do; on this view, phenomenal or protophenomenal properties are what they are.
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
Chalmers’s PanpsychismConditionalSince every physical system has phenomenal or protophenomenal properties at its base, an AI is built from the same ingredients as a brain. Whether it forms a unified conscious subject depends on how the unsolved combination problem is answered.
Orch ORNoConsciousness is fundamentally non-computational and relies on specific biological quantum processes (Orch OR in microtubules); digital simulation cannot replicate true sentience.
Chalmers’s PanpsychismUncertainThe fundamental properties outlast any body, but nothing in the view says whether the particular combined subject survives once the brain's structure breaks down.
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.
Chalmers’s PanpsychismUncertainAn upload would be made of the same fundamental properties, but whether it reconstitutes the same subject turns on the unsolved combination problem.
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.
Chalmers’s PanpsychismUncertainPlacing experience in the basic fabric of nature gives it a cosmic footing, but Chalmers draws no conclusions about meaning or purpose.
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
Chalmers’s PanpsychismPanpsychism (Russellian monism)
Orch ORQuantum Theory (Non-computational Physicalism / Proto-panpsychism)
Mind and body
Chalmers’s PanpsychismMind and matter are two sides of one fundamental stuff that has both physical and phenomenal properties. Chalmers places this ‘monism’ in the sixth of his six classes of views, the nonreductive ones that expand or reconceive physical ontology.
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
Chalmers’s PanpsychismPrimitive
Orch OREmergent/Primitive (Hybrid)
Qualia
Chalmers’s PanpsychismQualia are real and irreducible. In the panpsychist version they exist in simple form at the fundamental level; in the panprotopsychist version, basic entities have protophenomenal properties that are not themselves experiences but can ground them.
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
Chalmers’s PanpsychismChalmers reasons dialectically. Materialism (thesis) meets dualism (antithesis) and yields panpsychism; panprotopsychism challenges it and yields Russellian monism; the combination problem then challenges Russellian monism, with no settled resolution yet.
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
Chalmers’s PanpsychismThroughout physical reality, at the level of its most basic entities.
Orch ORLocalized within neuronal microtubules, particularly in the brain, but fundamentally drawing upon ubiquitous proto-conscious properties throughout the universe.
What it does
Chalmers’s PanpsychismBecause phenomenal or protophenomenal properties are the categorical bases of physical dispositions, consciousness sits at the base of physical causation itself.
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
Chalmers’s PanpsychismConceptually testable
Orch ORTheoretically testable; versions involving collapse dynamics can, in principle, be tested with quantum computers, though current tests are rudimentary.
Tests so far
Chalmers’s PanpsychismNot stated
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
Chalmers’s PanpsychismThe combination problem is the central difficulty, and Chalmers concedes it is unsolved. He also calls panpsychism initially counterintuitive, holding that the sense of oddity fades on reflection.
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
Chalmers’s Panpsychism
- Chalmers’s Panpsychism, David Chalmers (Landscape of Consciousness entry)
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)