I don't know, I know that I only once hit the wrong button, (during the yes no part, I think my left hand was so glad to be playing along that it hit at the first sign of a word, and that word was YES) so I had only one error and it says my brain is 18. See, that's my issue here, more detailed explanation of the test and how it comes to the conclusions it does. I'm always the scientist, I need to know more about the study.