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... Plato; he observed that whereas the body follows law embodied in psychical events and circumstances, the mind3 appears to be free from theses events. About 20 centuries after Plato, Descartes came up with a famous solution to the problem; he maintained that that the human body, like all physical entities, could be described by mechanical laws. Thus coming to the conclusion that mind and body must somehow meet, since their operations are in some ways interlinked. Plato's formulation called platonic dualism has been the subject of much debate and no final answer is possible with presently available technology. We can only analyse it carefully and review the answers that philosophers arrive at by using the method of metaphysical speculation. In an experiment the psychologist will usually have some hypothesis, which he or she is aiming to verify or disprove. Experiments use variables, which are manipulated to discover 'cause and ...