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Functionalism in Philosophy of Mind

Conceptual Structure

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Core Definition

Mental states defined by functional roles (inputs, outputs, other states).
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Multiple Realizability

Focus on 'what it does' rather than 'what it is made of'.
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Major Criticisms

The Problem of Qualia (Inverted Qualia, China Argument, Mary's Room).

Defining Functionalism

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Functionalism

Functionalism defines mental states not by their internal physical makeup but by their functional roles—the causal relations they bear to inputs, outputs, and other mental states.
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Identity

A mental state is identified by what it does rather than what it is made of.

Multiple Realizability

Flexibility of Physical Media

The strength of functionalism lies in its ability to separate mental identity from physical structure. This allows for the concept of multiple realizability, meaning the same mental state can exist in entirely different substrates.

This allows for multiple realizability—a mental state can be realized in diverse physical media (human brain, alien brains, sophisticated computers).

ISSUES WITH FUNCTIONALISM: The Qualia Problem

Functionalism, by focusing purely on causal roles, struggles to account for the subjective, qualitative experience (qualia) of mental states. These thought experiments illustrate the failure to capture phenomenal consciousness:

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Inverted Qualia It is conceivable two individuals have identical functional states but experience different qualia (e.g., one’s red is another’s green), challenging whether functionalism can account for subjective experience.
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Ned Block’s China thought experiment Imagining the whole population of China organized to simulate the functions of a brain. Does this system have mentality or qualia? The intuition is negative, posing a challenge to functionalism.
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The Mary argument The Mary argument can be applied to functionalism: knowledge of all functional facts about consciousness may not explain why mental states have the particular qualitative feel (qualia). This suggests functional facts do not suffice to explain phenomenal consciousness.
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Functionalism Philosophy Deck
Q
Functionalism: Mental States

What does functionalism say about mental states?

A
Answer

Mental states are defined by their functional roles, i.e., their causal relations to inputs, outputs, and other mental states, not by their physical makeup.

Q
Multiple Realizability

What is multiple realizability in functionalism?

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Answer

The idea that a mental state can be realized in different physical systems, such as human brains, alien brains, or computers.

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Problem of Inverted Qualia

What is the problem of inverted qualia?

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Answer

It is the possibility that two people could have identical functional states but experience different subjective sensations (qualia), challenging functionalism's account of experience.

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Ned Block's China Thought Experiment

What is Ned Block's China thought experiment?

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Answer

Imagining the entire population of China organized to simulate brain functions, questioning if such a system would have genuine mentality or qualia.

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Mary Argument

How does the Mary argument challenge functionalism?

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Answer

It suggests that knowing all functional facts about consciousness does not explain why mental states have particular subjective experiences.

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🧠 Functionalism Philosophy Quiz

1. Which best describes functionalism?

Functionalism defines mental states by their functional roles, not by their physical constitution.

2. What does multiple realizability imply?

Functionalism claims mental states can be realized in different physical substrates, like computers or alien brains.

3. The inverted qualia problem challenges functionalism because:

Inverted qualia raises the possibility of identical functions with different qualia, challenging functionalism’s ability to account for subjective experience.

4. Ned Block’s China thought experiment questions:

The experiment imagines a large-scale brain simulation questioning whether such a system would have genuine subjective experience.

5. The Mary argument suggests:

Mary knowing all functional information still lacks understanding of why experiences feel a certain way, pointing to limits of functionalism.

📊 Results

  • Notes and Quiz
  • PHILOSOPHY
  • A Level
  • Philosophy of Mind
  • AQA