Here is an article on speciation. In stickleback fish, a new aggressive male form has appeared, The Y chromosome having changed by fusing with another chromosome: -http://www.nature.com/news/2009/090927/full/news.2009.954.html-The authors conclude this is a totally new species, becasue the ladies from the former fish types don't want to mate with these guys. As a minoror behavioral change I call it a new sub-type, not a full species change.-And another view of how the brain has constant background noise, and how we tune in, by damping down the background:-http://www.sciencedaily.com/releases/2009/09/090923121447.htm