We haven't a clue how humans really evolved. Similarly, experiments on the brain tell us nothing except that we just don't know how the processes of consciousness (including the will) actually work. There is absolutely no consensus on either of these subjects, and although I think it's one of the most admirable of our human characteristics that we continue to seek the truth about ourselves, I do wish (a) that scientists and their media would stop making sensational announcements as if they really had uncovered some "truth", and (b) that scientists would own up to their personal limitations as well as to the limitations of their field.-The entire field of science writing would have nothing to do most of the time, if your wish is granted.-Fortuitously found this confusing mess:-Read article and ask yourself, how did they study single neurons 'in vivo'? Open skulls? Of course not. Can't get at the real article so I don't know:-http://www.sciencedaily.com/releases/2012/08/120809141629.htm