consciousness vs subliminal

consciousness

noun
  • The state of being conscious or aware; awareness. 

subliminal

noun
  • Chiefly preceded by the: something which is below the limen or threshold of conscious perception. 

  • An advertisement, a message, etc., which is conveyed in a manner that a person is unaware of being influenced by it. 

  • Chiefly preceded by the: the subconscious (dated) or unconscious self. 

adj
  • Of an advertisement, a message, etc.: conveyed in a manner that a person is unaware of being influenced by it. 

  • Without directed awareness or thought; subconscious (dated), unconscious. 

  • Of a stimulus: below the limen or threshold of conscious perception, especially if still able to produce a response; also (generally), below the threshold where a response can be produced. 

How often have the words consciousness and subliminal occurred in a corpus of books? (source: Google Ngram Viewer )