Comparative Scoreboard¶

A systematic comparison of the Four-Model Theory against six major consciousness theories across all eight requirements reveals that FMT is the only framework that addresses every requirement, while each rival theory leaves at least two requirements unaddressed.

Any theory aspiring to be a complete account of consciousness must confront eight distinct challenges: the Hard Problem, the Explanatory Gap, the Boundary Problem, the Structure of Experience, Unity and Binding, Combination and Emergence, the Causal Role of consciousness, and the Meta-Problem. Most theories were designed to address one or two of these. The scoreboard maps which theories address which requirements -- and where the gaps are.

The Scoring Matrix¶

The following table summarizes how each theory performs across the eight requirements. Ratings reflect a fair-minded assessment; where a theory's proponents would contest a rating, this is noted.

Requirement	FMT	IIT	GNW	HOT	PP	AST	RPT
Hard Problem	Addresses	Addresses*	Silent**	Partial	Silent**	Partial	Silent
Explanatory Gap	Addresses	Addresses*	Silent**	Partial	Silent**	Partial	Silent
Boundary Problem	Addresses	Addresses	Partial	Minimal	Partial	Partial	Partial
Structure of Experience	Addresses	Addresses	Partial	Partial	Addresses	Partial	Partial
Unity and Binding	Addresses	Addresses	Partial	Minimal	Partial	Minimal	Partial
Combination/Emergence	Addresses	Minimal***	N/A	N/A	N/A	N/A	N/A
Causal Role	Addresses	Partial	Partial	Partial	Addresses	Partial	Addresses
Meta-Problem	Addresses	Minimal	Partial	Partial	Partial	Addresses	Minimal

* IIT addresses the Hard Problem by identifying consciousness with integrated information (Phi). Whether this constitutes a solution or a redefinition is debated. ** GNW and PP proponents argue they address the "real problem" of consciousness -- explaining the structure and contents of experience -- even if they do not address the Hard Problem as Chalmers defines it. The "silent" rating reflects scope, not overall merit. *** IIT's panpsychist commitments generate the Combination Problem rather than resolving it.

Reading the Scoreboard¶

Three patterns emerge from the matrix.

No rival addresses the Hard Problem without cost. IIT addresses it, but at the price of panpsychism and the Combination Problem. HOT and AST offer partial treatments that explain why consciousness seems mysterious without fully accounting for phenomenality. GNW, PP, and RPT remain silent -- deliberately, in GNW's and PP's cases, treating the Hard Problem as outside their scope.

Access theories dominate empirically but underperform philosophically. GNW and RPT have strong empirical support (the ignition threshold, visual masking paradigms), yet neither explains why broadcasting or recurrence produces experience. They describe when consciousness happens, not what it is.

The Combination/Emergence requirement is the panpsychism filter. Only theories with panpsychist commitments (IIT) must confront the Combination Problem. Physicalist theories face the emergence question instead, but most sidestep it. FMT addresses it directly through weak emergence: each level of the five-system hierarchy is fully determined by the level below, with no ontological gap.

How FMT Achieves Full Coverage¶

The Four-Model Theory addresses all eight requirements through three interlocking mechanisms:

Virtual qualia dissolve the Hard Problem and close the Explanatory Gap simultaneously -- qualia exist at the computational level, rendering the substrate-level search a category error.
Criticality plus the four-model architecture provides principled boundary-setting, binding through critical dynamics, and structured experience through the explicit models.
The ESM's opacity to its own substrate explains the Meta-Problem as a structural consequence rather than a philosophical puzzle.

No other theory deploys mechanisms that span all eight requirements simultaneously.

Figure¶

graph LR
    subgraph REQ["Eight Requirements"]
        direction TB
        R1["Hard Problem"]
        R2["Explanatory Gap"]
        R3["Boundary"]
        R4["Structure"]
        R5["Binding"]
        R6["Combination"]
        R7["Causal Role"]
        R8["Meta-Problem"]
    end

    subgraph THEORIES["Theory Coverage"]
        direction TB
        FMT["FMT: 8/8"]
        IIT["IIT: 5/8 + 2 partial"]
        GNW["GNW: 0/8 + 3 partial"]
        PP["PP: 2/8 + 3 partial"]
        AST["AST: 1/8 + 3 partial"]
    end

    FMT ---|"all eight"| REQ
    IIT -.->|"HP costly, no Meta"| REQ
    GNW -.->|"silent on HP"| REQ
    PP -.->|"silent on HP"| REQ
    AST -.->|"strong Meta only"| REQ

    style FMT fill:#2d6a4f,stroke:#40916c,color:#fff
    style IIT fill:#6a1b2a,stroke:#a4243b,color:#fff
    style GNW fill:#1a1a2e,stroke:#555,color:#aaa
    style PP fill:#1a1a2e,stroke:#555,color:#aaa
    style AST fill:#1a1a2e,stroke:#555,color:#aaa
    style REQ fill:#0d1b2a,stroke:#1b3a4b,color:#fff
    style THEORIES fill:#0d1b2a,stroke:#1b3a4b,color:#fff

FMT is the only theory that provides a substantive account of all eight requirements. IIT has the broadest coverage among rivals but incurs the Combination Problem. Access theories (GNW, RPT) and schema theories (AST) leave the Hard Problem and Explanatory Gap untouched.

Key Takeaway¶

The comparative scoreboard reveals a structural gap in the field: every major theory except FMT leaves at least two of the eight requirements unaddressed, and no rival addresses the Hard Problem without incurring costs (panpsychism, deflationism) that FMT avoids through its two-level ontology.