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In the philosophy of mind, the doctrine that mental events are identical to physico-chemical events in the brain. So-called type identity theory asserts that each type of mental event, such as pain, is identical to some type of event in the brain, such as the firing of c-fibres. In response to objections based on the assumed multiple realizability of mental states, token identity theory makes the weaker claim that each token of a mental event, such as a particular pain, is identical to some token of a brain event of some type. See alsomind-body problem.
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