talk at vs talk to

talk at

verb
  • To speak with; to have a conversation with. 

  • To speak with (someone) without truly listening to their response or interacting meaningfully. 

talk to

verb
  • Used other than figuratively or idiomatically: see talk, to. 

  • To show the beginnings of a romantic interest in; to flirt with over a period of time in hopes of developing a romantic relationship. 

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