Philosophy 101, Summer Semester 2021
Handout #3
Paul Churchland, Dualism
Dualism
1. Substance Dualism
· Mind as a distinctive non-physical thing
· Descartes: two kinds of substance make up reality
· Matter (spatially extended)
· Mind/thinking (not spatially extended)
· Mind causally interacts with body
· Reasons:
· Introspection
· Language/mathematical reasoning
· Problems:
· How is causal interaction possible?
· Matter is not usefully conceived as having spatial extension as its core characteristic
2. Popular Dualism
· Mind is literally ‘in’ the body
· Mind/body interaction to be understood as exchange of energy
· Mind might survive death of body
3. Property Dualism
· Mind is a not a substance
· Brain has specific set of properties possessed by no other physical object
· Mental properties not reducible to physical properties
· Different versions
· Epiphenomenalism:
· Mental phenomena emerge when growing brain passes certain level of complexity
· Mental phenomena have no causal power
· Actions exhaustively determined by physical events
· Motivation: conflicting demands of
· Scientifically informed view of brain
· Introspective evidence
· Interactionist property dualism
· Mental properties do have causal power
Arguments in Favour of Dualism
1. Religious belief
· Immortality
· But: not compatible with scientific evidence
· Social forces as determinants of religious belief
2. Argument from introspection
· Apprehension not of neural network, but of thoughts, desires, sensations, etc.
· But: maybe our faculty of introspection not sophisticated enough
· Consider senses
3. Argument from irreducibility
· No physical science capable of accounting for subjective character of experience
· But: consider mathematical skills of computers; computer languages
Arguments against Dualism
1. Ockham’s Razor
· Don’t multiply entities beyond explanatory necessity
2. Explanatory advantage
· Much knowledge about the brain already in place
· Microchemistry, processing of sensory information, neurology
· By contrast: no detailed theory of ‘mind stuff’ available
· Argument from neural dependence: reason, emotion, and consciousness can be shown to be heavily influenced by brain activity
· i.e. drugs, neural damage, caffeine
· Argument from evolution
· Mechanism of evolutionary development
· Occasional blind variation in types of reproducing creatures
· Selective survival of some of these types due to reproductive advantage enjoyed by individuals of those types
· Human species and all of its features are the wholly physical outcome of a purely physical process
· ‘We are creatures of matter’
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