I suppose the pyschologists and pyschiatrists - called "shrinks" in popular parlance - have their own code of silence. Once they are certified to practice, they are not supposed to give away the secret tests and techniques about how they figure out of the person lying on the couch is normal or abnormal depending on the response to the tests. To the person being tested this can evoke different feelings eg Awe or Aw (short for awful) and everything in between. So naturally people are anxious - which by itself could tell the shrink stuff about you that you don't want them to know.