Head to head
Functionalism vs Recurrent Processing Theory
Functionalism and Lamme's Recurrent Processing Theory, 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, Functionalism says “Conditional” and Recurrent Processing Theory says “No”.
Add more theories to this comparisonCompare other theories
The claim
In brief
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.
Recurrent Processing TheoryLamme's Recurrent Processing Theory (RPT) posits that consciousness is both necessary and sufficient when reciprocal (recurrent) feedback connections occur among neural areas, particularly in sensory systems. This processing, which happens locally in sensory and post-sensory areas (Stage 3), generates phenomenal experience without requiring global broadcast access.
What consciousness is
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.
Recurrent Processing TheoryConsciousness is identified as a specific recurrent processing state holding within relevant neural circuitry, such as the visual system.
Big questions
Can AI be conscious?Both agree
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.
Recurrent Processing TheoryLikelyAs a Materialism Theory, AI consciousness must, in principle, be possible if the requisite pattern of recurrent processing could be artificially duplicated in a non-biological substrate.
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).
Recurrent Processing TheoryNoConsciousness is tied to physical brain activity and specific neural circuitry (recurrent processing states), suggesting cessation upon bodily death.
Could a mind be uploaded?Both agree
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.
Recurrent Processing TheoryYesSince consciousness is the recurrent processing state itself, a perfect duplication of that process onto a new medium (upload) would generate the first-person self, enabling virtual immortality.
Does it give life meaning?Both agree
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.
Recurrent Processing TheoryHumanistic onlyThe theory focuses on a purely physicalist, neurobiological explanation of phenomenal experience and does not support any ultimate cosmic meaning or purpose.
Nature of mind
Ontology
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.
Recurrent Processing TheoryPhysicalism
Mind and body
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'.
Recurrent Processing TheoryIdentity/Reductionist approach, arguing that the notion of mind must move toward that of the brain, and consciousness is identical to a recurrent processing state in physical circuitry.
Fundamental or emergent
FunctionalismEmergent. Consciousness arises from the functional organization realized by a sufficiently complex substrate (like neural tissue or computer chips).
Recurrent Processing TheoryEmergent
Qualia
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.
Recurrent Processing TheoryQualia are generated when a certain recurrent processing state holds of the relevant visual circuitry, making the visual state conscious.
How it works
Mechanism
FunctionalismThe principle of multiple realizability, stating that mental state realization is independent of the physical substrate, contingent only upon the required function being instantiated.
Recurrent Processing TheoryRecurrent processing (feedback connections) in sensory and post-sensory areas (Stage 3) is considered sufficient for consciousness.
Where it is
FunctionalismDistributed wherever the functional organization is successfully realized, regardless of whether the substrate is neural tissue or hardwired computing components.
Recurrent Processing TheoryLocalized in sensory and post-sensory areas, specifically recurrent activations in the 'back of the head'.
What it does
FunctionalismFunctions, roles, and outputs are dispositive. Mental states are causally effective because they are defined by their causal relations within the system (functional role).
Recurrent Processing TheoryConsciousness is the specific recurrent processing state itself. The underlying purpose is implied to move the understanding of mind toward the brain.
Evidence and criticism
Testability
FunctionalismConceptually and empirically testable. Thought experiments (like substrate replacement) probe its conceptual limits, and computational realization (AI) tests its empirical application.
Recurrent Processing TheoryEmpirically testable
Tests so far
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.
Recurrent Processing TheoryNot stated
Criticisms
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.
Recurrent Processing TheoryCritiques Global Workspace Theory (GWT) as being 'all about access but not about seeing'. Is itself criticized by Ned Block as a 'truncated form of the global workspace account'.
Sources
Key sources
Functionalism
- What is functionalism? (N. Block) (1980)
- What Is Functionalism? Consciousness, Function, and Representation (N. Block) (2007)
- Functionalism (J. Levin) (2023)
Recurrent Processing Theory
- Towards a true neural stance on consciousness, Victor Lamme (2006)
- How neuroscience will change our view on consciousness, Victor Lamme (2010)
- Wu, 2018 (Discussing Lamme's RPT) (2018)