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The materialist asserts that consciousness has no existence apart from the body, is indeed a product of the brain. A blow on the head may deprive a man of consciousness; an operation on the brain may change its mode of functioning. The mentalist says that these only provide the conditions which normally limit consciousness, thus making it seem as if the brain created it. But under abnormal states (like anaesthesia, hypnotism, drugs, or deep meditation) consciousness shows its own separate being.
-- Notebooks Category 21: Mentalism > Chapter 1 : The Sensed World > # 91