There are numerous ways in which a person might be aware that someone else is nearby. Some are obvious (you can see them or their shadow) but many of them are very subtle. Here are just a few of the very subtle indicators which it is possible a human being could detect:
- a change in ambient temperature
- very, very faint sounds such as the normal saliva / swallowing reflex
- the vibration of even very soft, gentle foot steps
- extremely faint changes to ambient light and shadow
- ambient chemical changes caused by another person’s breathing
… and so on. I’m not saying most of us do notice these kinds of changes under normal circumstances. I’m merely suggesting that there human senses can operate at very subtle and supran-normal levels. And it is therefore possible for a person to be ‘aware’ of someone else’s presence without being entirely sure how they are aware. We’ve had a few million years of evolutionary survival to develop lots of “is there anything dangerous nearby?” tactics.
So the next question is, can a person tell someone else is nearby even when none of these sensory cues are present? The only person I know of who has seriously advanced such a theory is Rupert Sheldrake, who wrote about it in his book ‘Seven experiments that would change the world’.
The book itself doesn’t describe experiments which were conducted, merely ones that could be.
After publication, Richard Wisemanat the University of Hertfordshire (here in the UK) set up experiments to test Sheldrake’s theory. Results were no better than chance.
I know wiseman quite well and I’ve met Sheldrake. Sheldrake struck me as perfectly sincere and earnest, genuinely fired up by the possibilities that lie at the fringes of conventional science, and passionately enthusiastic to the point where he is a little blind to the deficiencies of some of his own theories and some of his own reasoning. He tends to jump the gap from ‘could be true’ to ‘we’ve proved it true’ a little too hastily. He did a lot of work on ‘psychic pets’ who could allegedly detect when their owner was approaching home, and declared experimental proof had been obtained. Wiseman replicated the experiments and found no evidence of such ability.
So, you pays your money, you takes your choice.
Is it a cool idea, kinda fascinating? Yep.
Do lots of people feel and believe that they do have some sort of innate ‘sense’ of when someone’s near, that isn’t just subtle sensory cues? Yes indeed, including several Dopers, apparently.
Has some scientific experiments been done to look into this? Yep.
Is there any scientific evidence, thus far, that this kind of ability is for real? No.
At which point many will chime in and say, ‘Ah, but science can’t tell us everything…’ . And so the debate goes on.