SPIRITLESS HUMANS...

Empty people. Puppet people. Cardboard cutouts. Drones. Organic Portals. Background characters. Why do these terms even exist? 

Because out of necessity they had to be invented by those who independently noticed the same puzzling phenomenon, one for which there is no official name: some people seem to be missing something very important inside. 

While they are not necessarily any less intelligent, successful, or physically healthy as anyone else, they nevertheless show no indication of having any higher components to their consciousness.