attention vs grey matter

attention

noun
  • Mental focus. 

  • A technique in neural networks that mimics cognitive attention, enhancing the important parts of the input data while giving less priority to the rest. 

  • An action or remark expressing concern for or interest in someone or something, especially romantic interest. 

  • A state of alertness in the standing position. 

intj
  • A call for people to be quiet/stop doing what they are presently doing and pay heed to what they are to be told or shown. 

  • Used as a command to bring soldiers to the attention position. 

grey matter

noun
  • Brains; a person's ability to think. 

  • A collection of cell bodies and (usually) dendritic connections, in contrast to white matter. 

  • Literal brains as a general substance. 

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