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Some philosophers attempt to explain consciousness directly in neurophysiological or physical terms, while others offer cognitive theories of consciousness whereby conscious mental states are reduced to some kind of representational relation between mental states and the world.
Some differences between physiological mechanism and the brains mechanism is that the physiological mechanisms are based on food, water, and sex. When the body becomes deficient in food, water, or sex they will trigger the unconscious mind that the brains mechanisms works to send a response to our conscious mind.