Yesterday I realized something that should have been obvious: there are two separate interaction problems for dualism.
Metaphysics: How does the soul manage to cause effects in the body?
Physics: Wouldn’t such causation violate the laws of physics?
I used to think of the interaction problem as just (1), and hence I thought it was spurious once one learned from Hume that all cases of causation are equally mysterious.
But problems (1) and (2) are pretty independent: one can have a solution to each without a solution to the other. For instance, an indeterministic physics provides a solution to (2), but says nothing about (1), while occasionalism and hylomorphism provide solutions to (1), but say little about (2).
While I think the questions are interesting, I don’t really think either poses a serious problem for interactionist dualism.
