Philosophy of Mind
In “What Mary Didn’t Know” Frank Jackson takes a more forceful stance against
physicalism. Jackson presents an argument for the conclusion that physicalism is false.
His argument has come to be known as “The Knowledge Argument.”
Jackson’s Knowledge Argument
1. If physicalism is true, then there are no facts about the world
that Mary doesn’t know when she is in the black-and-white
2. It is not the case that there are no facts about the world that
Mary doesn’t know when she is in the black-and-white room.
3.Therefore, it is not the case that physicalism is true
Justification for premise 1:
In the black-and-white room Mary has learned all of the physical facts about the
But according to physicalism the only facts about the world that there are are
So if physicalism is true, Mary knows all of the facts about the world that there
Justification for premise 2:
When Mary leaves the black-and-white room she learns som