Kim V. Searle

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Much like the course any sporting event is bounded by the rules of the game, the course of any philosophical discussion is bounded by the ideas accepted as axioms. A game of soccer in which the players were permitted to hold the ball in their hands would be radically different, even incomparable to a traditional game, even if all other factors (weather, location, player’s skill) were physically identical. In much the same way, although both begin with the same set of facts (materially closed universe, constant physical laws) Jaegwon Kim’s view on mental causation is radically different from Searle’s, because they approach the issue from different philosophical perspectives. Neither is wrong, if you reason using their principles. Neither is right, if you reason using the opposing principles.

Kim’s principles are this: mental states are macrostates (which may be multiply realized), supervenient on physical microstates. This supervenience can be seen as a sort of “vertical causation,” in which a microstate causes macroproperties to exist. He also allows for “horizontal causation,” in which physical states cause or compel other physical states, according to physical laws. His contention is that if a microstate, say m(F) of object X both vertically causes a macrostate F and horizontally causes another microstate, m(G) (which then causes its own macrostate G), it would be a mistake to say that the supervenient macrostate G is caused by F, even if (on the macro level) one appears to cause the other. That sort of macro causality Kim would describe as epiphenomenal causation, and therefore causally inert.

Searle takes a different approach. He begins by rejecting completely the distinction between physical and mental, folding in all menta...

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... in” certain aspects (mental aspects) that would otherwise be inexplicable in a sound theory. Searle’s account, in which singular events have multiple aspects, is appealing. However, it appears that by claiming that “mental” is an aspect of a larger physical event, one aspect of an event can have an ontological uniqueness that is not present in the other aspects. And since all aspects are facets of one physical process, it seems that Searle is saying that by simply thinking of an event one way, you can imbue it with properties not otherwise present. This seems too easy. In addition, Searle states in his response to Kim “there are no causal powers of [mental state] that are not causal powers of the neural structure.” If the ontologically irreducible aspect of a physical state confers no additional causal power, then that mental aspect is simply “along for the ride.”

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