The chemical reactions are interesting to watch. Technology has really come a long way to be able to show us that stuff. Artificially injecting joy, love, depression, etc... I'd love to know first hand how artificially induced joy compares to the real thing (not being cynical). Or how artificial love corresponds with the natural relation.
My only quibble here is that the observation is [still] an apparent thing that can be scientifically deduced (or reduced), rendering emotions academic (not that I'm saying there's something wrong with scientific deduction, per se). Do you personally attribute human emotion as little to nothing more than chemical stimulation?