I came to know about the extended mind from the following presentation by Rupert Sheldrake who presented his research at Google TechTalk.
Sheldrake claims that the horizon of power of our brain is not limited to the physical brain which we see and observe but its extended outside also. This is like a invisible radius of power like electromagnetic field; when we are very close to some person, we can feel and get sense of their action, no matter what is the distance they are away.
Just after the 18m mark he states:
Another way of thinking about this is through quantum entanglement and Dean Radin who gave a talk here at Google some time ago -a few months ago - has written a book called Entangled Minds suggesting that when people have close social relationships and interactions their minds become entangled so that when they separate there is a still an entanglement between them and so a change in one is reflected by a change in another.
Quantum non-locality - entanglement of quantum particles - is well known, well documented and is in fact the basis of now technological applications in quantum cryptography and quantum computing. And what that shows is that particles that are part of the same system when they move apart, a change in one is immediately associated with a change in the other. This is independent of distance unlike many other physical phenomena. It doesn't matter if it is an inch apart or a mile apart; it's distance independent entanglement or non-local connection.
I am suggesting something like that happens in the case of animal groups, and in social groups in general, including human groups.
Do our minds get quantum entangled?