The person who falls suddenly experiences immunity to all pain or sensory stimuli because the central nervous system has to be protected from any int… - Marshall McLuhan

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The person who falls suddenly experiences immunity to all pain or sensory stimuli because the central nervous system has to be protected from any intense thrust of sensation. Only gradually does he regain normal sensitivity to sights and sounds, at which time he may begin to tremble and perspire and to react as he would have done if the central nervous system had been prepared in advance for the fall that occurred unexpectedly.