If every distinct mental state has a distinct ("corresponding") physical state,

If every distinct mental state has a distinct ("corresponding") physical state,

If every distinct mental state has a distinct ("corresponding") physical state, how could we tell which was causing which at any given moment? I'm sure that in certain contexts it would be more practical to answer that the mental state was caused by the physical state (e.g., "P is just irritable because he hasn't eaten"), and that in certain other contexts it would be more practical to answer that the mental state caused the physical (e.g., "P moved his hand because he decided to")--but is there any context-free answer to this question, i.e., the question as to whether the mind controls the body or whether the body controls the mind at any given moment?

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