What is MBTIT?
Types of mental states are ontologically reducible/identical to types of brain states. E.g, mental states are brain states.
What is ontological reduction?
Continently identical e.g, brain states and mental states are contingently identical, thus mental states ontologically reduce to brain states.
An ontological reduction is NOT an analytic reduction - no contradiction.
E.g, water is H20
Explain Ockham’s razor in favour of physicalism.
Used as an argument in favour of physicalism more generally.
We can explain just as much about mental states by referring to the brain as we can by referring to a non-physical mind.
E.g, a physicalist would say that c-fibres and pain are the same physical thing, just different concepts.
Explain the denial of analytic reduction
Smart - ontological reduction does not imply or entail an analytic reduction
Mental states and brain states are ontologically identical - but mental states state language is not synonymous with brain state language.
Philosophical considerations
If there are phenomenal properties, then they will be reducible to brain states ,
If there are intentional properties, then they will be reducible to brain states.
Interaction problem applied to MBTIT
Problem of other minds
Problem of multiple realisability
If MS1 are identical to BS1 (MS1=BS1), but mental states can be multiply realised (MS1=BS2, BS3 etc), then contradictions occur
(M2=B1, M1=B2 - B1 DOES NOT EQUAL B2)
Problem of chauvinism
MBTIT -> humans are the only beings that can have mental states -> eliminates mental states in other species based upon MS being identified with HUMAN brain states.