have on the brain vs obsessed

have on the brain

obsessed

adj
  • Intensely preoccupied with or by a given topic or emotion; driven by a specified obsession. 

  • Influenced or controlled by evil spirits, but less than possessed in that the spirits do not actually reside in the victim. 

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