for me i believe human kind only lost that ability through some stressful time in history or had it for ever but never really knew we had it and i believe it can still be activated but with very much training and discipline.
in fact communication between humans in there subconscious happens constantly, take for instance when you are in a conversation sometimes it occurs that another person in the conversation says precisely what you thought of.
i believe it is thought that gets transfered but the other persons brain is not trained to look for such transfer so it occurs only a few times and is not constant.
also go check out http://www.notunique.ca/content/blog/a-powerful-rabbit-experiment.shtml
This is probably the only experiment of it's kind that is open to read and not classified.