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Corresponding to memory, for example, there must be some physical modifying of the brain, and mental life must be connected with physical properties of the brain tissue. In fact, if we had more knowledge, the physical and psychological statements would be seen to be merely different ways of saying the same thing. The ancient question of the dependence of mind on brain, or brain on mind, is thus reduced to linguistic convenience. In cases where we know more about the brain it will be convenient to regard the mind as dependent, but in cases where we know more about the mind it will be convenient to regard the brain as dependent. In either case, the substantial facts are the same, and the difference is only as to the degree of our knowledge.
Source: Bertrand Russell : Mind and Matter (1950年11月？)
More info.: https://russell-j.com/beginner/19501110_Mind-Matter160.HTM