this is a sociopath http://en.wikipedia.org/wiki/Mirroring_(psychology)
http://www.youtube.com/watch?v=6V7EL-Yg8Gg
(black tshirt guy mirroring obama or obama mirroring black tshirt guy)
and this is a psychopath
http://www.psychologytoday.com/files/attachments/112693/psychopathy-versus-sociopathy.pdf
http://www.youtube.com/watch?v=lZP6YKnxMHk
there is other examples but this is good enough to give a general idea
psychopaths also have lowered scent abilities