apperception vs pelmanism

apperception

noun
  • The general process or a particular act of mental assimilation of new experience into the totality of one's past experience. 

  • The mind's perception of itself as the subject or actor in its own states, unifying past and present experiences; self-consciousness, perception that reflects upon itself. 

  • Psychological or mental perception; recognition. 

pelmanism

noun
  • A system of training to improve the memory. 

  • A memory card game in which a pack of cards is spread out face-down and players try to turn up pairs with the same symbol. 

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