ipseity vs selfhood

ipseity

noun
  • selfhood; individual identity 

selfhood

noun
  • State of having a distinct identity, or being an individual distinct from others; individuality. 

  • The fully developed self; one's personality, character. 

  • The quality of being self-centered or egocentric; selfishness. 

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