Causal Stance

The Big Problem: Two Different Languages for One Reality

Imagine you are trying to describe a car.

The Mechanic (Physics) looks at the engine and says, "If I turn this gear, that gear turns. Everything follows strict, unbreakable rules of physics. There is no 'choice' in the gears; they just move because they have to."
The Driver (Causation) looks at the steering wheel and says, "I decided to turn left. My action caused the car to go left. If I hadn't turned the wheel, the car would have gone straight."

The problem in the philosophy of mind is that we often try to mix these two languages. We ask: "If the car is just gears and physics (Mechanic), how can the driver actually do anything?"

This paper argues that we have been speaking two different languages and confusing them. The authors, Ohmura and Kuniyoshi, propose we stop trying to translate everything into one language and instead acknowledge that we need two different "stances" (perspectives) to understand the mind.

1. The Two Stances: The Map vs. The GPS

The authors introduce two ways of looking at the world:

The Physical Stance (The Map)

What it is: This is the language of pure physics. It looks at the universe like a giant, complex clockwork machine.
How it works: It sees everything as particles and forces. In this view, time is symmetrical. If you know the state of the universe right now, you can calculate the past and the future.
The Catch: In this language, there is no such thing as "cause" and "effect" in the way we feel it. A gear doesn't "cause" another gear to move; they just move together according to math. There is no "driver" here, only moving parts.
Key Rule: Physical Determinism. Everything is determined by what came before. Nothing is random, and nothing is "free."

The Causal Stance (The GPS)

What it is: This is the language of cause and effect, used in science, psychology, and daily life.
How it works: It relies on manipulation. If I change the input (turn the wheel), the output changes (car turns). If I don't change the input, the output stays the same. This creates an asymmetry: I can cause the car to turn, but the car turning cannot cause me to turn the wheel.
The Catch: Physics doesn't have a word for this "manipulation." You can't find "cause" in a physics textbook equation.
Key Rule: Causal Closure. This is the idea that every physical event has a physical cause. But the authors argue this concept only makes sense in the Causal Stance, not the Physical Stance.

2. The Confusion: Jaegwon Kim's Mistake

The paper criticizes a famous philosopher named Jaegwon Kim. Kim tried to prove that the mind cannot control the body.

Kim's Logic: He said, "The physical world is 'causally closed.' This means every physical event is caused by a previous physical event. Therefore, the mind (which is not physical) can't push the body around."
The Authors' Rebuttal: Kim made a category error. He treated "Physical Determinism" (the clockwork rules) as if it were the same thing as "Physical Causal Closure" (the idea that causes must be physical).
The Analogy: Imagine Kim saying, "Because the map shows a straight line from A to B, the GPS driver couldn't have turned the car."
- The Map (Physics) shows the path is determined by the road.
- The GPS (Causation) shows the driver chose that path.
- Both can be true at the same time! The road exists (Physical Stance), but the driver's choice is real within the context of driving (Causal Stance).

By confusing these two, Kim accidentally "killed" mental causation. The authors say: Don't mix the languages.

3. The Solution: The Dual-Laws Model

The authors propose a new model called the Dual-Laws Model (DLM) to save the idea that our minds can do things.

Imagine a Video Game:

The Sub-venient Layer (The Code): This is the physics. The computer code runs on strict, deterministic rules. If the code says "jump," the character jumps. Nothing in the code is "free."
The Super-venient Layer (The Player): This is the mind. The player sees the game world and makes choices.

How it works:

From the Player's View (Causal Stance): The player presses "A" to jump. This is a real cause. The player's intention changed the game. The player is the "cause."
From the Code's View (Physical Stance): The computer sees a signal "1" coming from the input port. It processes "1" and updates the screen. The code doesn't know about "players" or "intentions." It just sees numbers changing based on numbers.

The Magic Trick:
The authors show that you can have a system where:

Physically: Everything is determined by the code (Physical Determinism holds). No magic energy is added.
Causally: The player's choices are real causes that change the outcome (Mental Causation holds).

They call this Anomalous Monism. It means:

Monism: There is only one stuff (the physical code).
Anomalous: The rules for the "Player" (mental laws) are weird and messy (different for everyone), so they don't look like strict physics laws. But they still work on top of the physics.

4. Why This Matters

If we accept this distinction, we can finally talk about the mind without breaking physics.

For Science: We don't need to invent "ghosts in the machine" or magical forces. We just need to admit that when we study the mind, we are using the Causal Stance (looking for causes and effects), not the Physical Stance (looking for particle collisions).
For Free Will: It suggests that while our brains are made of atoms that follow strict laws, our "self" operates at a higher level where we can intervene and make choices. We are the "drivers" of the "car," even if the car is just metal and gears.

Summary in One Sentence

The mind and body aren't fighting; they are just speaking different languages: the body speaks the strict language of physics (where everything is determined), while the mind speaks the language of cause-and-effect (where we make choices), and both can be true at the same time.

1. Problem Statement

The paper addresses a fundamental ambiguity in the philosophy of mind regarding mental causation and physical causal closure.

The Core Conflict: Jaegwon Kim's "exclusion argument" relies on equating physical causal closure with physical determinism. Kim argues that if physical states are fully determined by prior physical states (determinism), there is no room for mental causation.
The Linguistic Gap: The authors argue that this equivalence is a category error arising from a failure to distinguish between two distinct descriptive frameworks:
1. The Physical Stance: The language of physics, which describes temporal evolution via symmetric laws (e.g., $f=ma$) without distinguishing cause from effect. In this stance, "causation" is undefined.
2. The Causal Stance: The language of causality (based on manipulability and intervention, e.g., Pearl's framework), which explicitly introduces asymmetry (cause $\to$ effect).
The Consequence: Because physics does not define causation, "physical causal closure" is an undefined term within the Physical Stance. Equating it with physical determinism leads to the false conclusion that mental causation is impossible. The paper seeks to resolve the tension between Anomalous Monism (Davidson) and physical determinism by clarifying these stances.

2. Methodology

The authors employ a conceptual analysis combined with a formal modeling approach:

Conceptual Distinction: They rigorously separate the Physical Stance (physics as a descriptive system of state evolution) from the Causal Stance (causality as a system of intervention and asymmetry).
Reconstruction of Anomalous Monism: They reinterpret Donald Davidson's Anomalous Monism by mapping its three core tenets onto the distinction between the two stances.
Formal Modeling (Dual-Laws Model - DLM): They propose a mathematical framework, the Dual-Laws Model, to demonstrate how a system can satisfy physical determinism in the Physical Stance while allowing for mental causation in the Causal Stance.
- The model utilizes a hierarchical system with a supervenient layer (mental) and a subvenient layer (physical).
- It employs self-referential feedback mechanisms where changes in the supervenient layer (selection/ordering of functions) act as "causes" that modify the dynamics of the subvenient layer.
- Crucially, they utilize Pearl's assignment operator ( $:=$ ) to denote causal asymmetry in the Causal Stance, contrasting it with the symmetric equality ( $=$ ) used in the Physical Stance.

3. Key Contributions

Decoupling Causal Closure from Determinism: The paper establishes that Physical Determinism (states determined by prior states via laws) is a property of the Physical Stance, whereas Physical Causal Closure (the claim that no non-physical causes affect physical states) is a concept that only exists within the Causal Stance. Therefore, they should not be equated.
Reconstruction of Anomalous Monism: The authors successfully reconstruct Davidson's Anomalous Monism to show it is logically consistent with physical determinism if one distinguishes between:
- P-Physical Laws: Strict, deterministic laws governing state evolution in the Physical Stance.
- C-Physical Laws: Laws governing physical events in the Causal Stance, which are influenced by mental events and are therefore "anomalous" (not strict).
The Dual-Laws Model (DLM): They provide a concrete mechanism for mental causation where:
- Supervenient causes are defined as changes in the construction of equations (selecting and ordering subsets of functions) rather than the functions themselves.
- These changes act as interventions on the subvenient layer via a feedback loop.
- This allows the system to be deterministic from the outside (Physical Stance) but exhibit top-down causation from the inside (Causal Stance).

4. Results

Logical Consistency: The study demonstrates that Anomalous Monism does not contradict physical determinism. The apparent contradiction in Kim's argument arises only when one fails to distinguish between the two stances.
Resolution of the Exclusion Problem: By showing that C-Physical Causal Closure can be false (mental events influence physical laws in the Causal Stance) while P-Physical Determinism remains true (all state changes are determined by prior physical states in the Physical Stance), the paper validates the existence of mental causation without violating physical laws.
Formal Validation: The Appendix details the mathematical formulation where the dynamics of the subvenient layer ( $x_{t+1}$ ) are determined solely by previous subvenient states ( $x_t$ ) in the Physical Stance ( $x_{t+1} = f(x_t)$ ), but in the Causal Stance, the function $f$ itself is modified by the supervenient state ( $c$ ) via the assignment operator ( $e := s(c)$ ), representing mental intervention.

5. Significance

Philosophical Impact: The paper offers a robust defense of materialism that accommodates mental causation. It suggests that the "hard problem" of consciousness and the exclusion argument are partly linguistic artifacts caused by conflating the language of physics with the language of causality.
Scientific Framework for Consciousness: It argues that the science of consciousness requires a linguistic framework distinct from pure physics—one that incorporates the Causal Stance. This allows for the development of practical theories in fields like volition and neuroscience where mental causation is a necessary explanatory variable.
Future Directions: The authors propose that future scientific models of the mind should explicitly specify which "Stance" is being used. This distinction prevents the conflation of "physical determinism" (a fact of physics) with "physical causal closure" (a constraint of a specific causal model), thereby opening the door for scientific theories that treat consciousness as a causal agent without invoking dualism or violating physical laws.

In summary, Ohmura and Kuniyoshi argue that mental causation is real because the Causal Stance allows for asymmetric interventions that are invisible to the Physical Stance, and their Dual-Laws Model provides the technical architecture to prove this coexistence is mathematically and logically sound.