PHILOSOPHY OF MIND
Comparative Schema
| Position | What is the mind? | Relation to the physical | Can the mind cause physical events? | Main problem / counterexample |
|---|---|---|---|---|
| CARTESIAN DUALISM | The mind is an immaterial thinking substance. | Mind ≠ body. The mind and body are two different substances. | Yes. Mind and body interact. | Interaction problem: How can an immaterial mind interact with a physical body? |
| LOGICAL BEHAVIORISM | A mental state is a behavioral state or behavioral disposition. | Mental states are reducible to behavior. MS = BS | Mental states are explained through behavior. | Perfect Pretender: someone can behave as if they are in pain without feeling pain. Spartan: someone can feel pain while suppressing all pain behavior. |
| IDENTITY THEORY | A mental state is a brain state. | Mind = brain. MS = BrS | The physical brain causes behavior; no separate immaterial substance is needed. | Nagel's Bat: knowing all the physical facts does not tell us what it is like to experience the world as a bat. Lewis's Martian: something can feel pain without having the human neurophysiological state associated with pain. |
| FUNCTIONALISM | A mental state is a functional/causal state—a state defined by what it does within a system. | Mental states are identified with functional roles. MS = FS | Yes. Mental states can cause other mental states and behavior. | Inverted Spectrum: two people may have the same functional state but different qualitative experiences. Mad Man: someone may have pain while exhibiting a completely different functional response. |
| EPIPHENOMENALISM | The mind is an ineffective byproduct of physical processes. | Physical → Mental | No. The brain affects the mind, but the mind does not affect the brain or behavior. | Causal problem: if mental states have no causal power, how can we explain our apparently causally effective thoughts, feelings, and reports about them? |
| MENTAL IRREDUCIBILITY / PRIMITIVE PROPERTIES | Mental states are irreducible properties that cannot be reduced to behavior, brain states, or functional states. | Mental properties emerge from physical phenomena but are not reducible to them. | Yes. Mental processes can have their own causal role. | Emergence problem: how do irreducible mental properties arise from physical processes? |
The Central Question
All of these positions can be understood as different answers to one fundamental question:
WHAT EXACTLY IS A MENTAL STATE?
Behaviorism: a mental state is behavior / a behavioral disposition.
Identity Theory: a mental state is a brain state.
Functionalism: a mental state is a functional/causal role.
Mental Irreducibility: a mental state cannot be reduced to any of these.
The General Movement
MIND → BEHAVIOR → BRAIN → FUNCTION → IRREDUCIBLE MENTAL PROPERTIES
The counterexamples are important because each one challenges the proposed reduction:
Behaviorism
→ behavior does not guarantee the corresponding mental state.
Identity Theory
→ knowing the physical state does not necessarily tell us what the experience is like.
Functionalism
→ the same functional role does not necessarily guarantee the same qualitative experience.
Therefore: mental states may possess properties that are private, subjective, first-person, and irreducible to behavioral, physical, or functional descriptions.
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