Beware of mistakes, and possibly bias in brain scan studies. Results can be fishy:- http://blogs.nature.com/news/thegreatbeyond/2009/09/study_warns_of_red_herrings_in.html... a reasonable discussion about care in interpretation: false positives.-http://www.newscientist.com/blogs/shortsharpscience/2009/09/dead-salmon-responds-to-portra.html-Or do animals have metacognition like humans. Is this a stretch of a yes-no-maybe problem for a monkey, etc?-http://www.physorg.com/news172160987.html