There's really no concrete evidence that 'we' are grounded in our physical bodies. Certainly, it's been shown that if specific areas of the brain are stimulated by researchers, specific emotions and memories result, but this may be similar to tuning a radio in to different stations.
None of us believes that news and weather, music, discussions, commercials, etc are contained within the radio itself. We realise that what we hear is accessed by means of the radio's tuning device/knob/dial. We appreciate that the news, weather, music etc. emerges from various radio stations/channels, which in turn may be located two miles away or ten thousand miles away, depending on the quality and type of radio.
Similarly (imo) our brains may 'tune into' a variety of stations/channels. Some of us may have limited-range type brains --- whilst others (similar to short-wave radios) are able to tune into distant and even exotic stations/channels. This may account for the fact some people are able to access information (clairvoyance or precognition for example) which seems impossible to others.
Our memories (and consciousness/subconscious/superconscious) may not be stored within the physical brain at all, but may be 'offshore' or 'out there somewhere', i.e., 'Mind'. It may be that the brain handles physical funtion ... and also acts as radio-tuner for access of emotion, memory, thought, etc.
When people suffer loss of short or long-term memory as the result of injury to the brain, it may be that the brain's tuning-mechanism has become damaged, resulting in its inability to any longer 'tune into' short or long term memory which is located in Mind.
In this way, our 'minds' could be regarded as the 'real us' ... with the brain (and body) being merely the physical/temporary embodiment of 'us' on earth. In other words, 'you' (the person you are right now, this moment) may actually be an outpost of a much larger, more complex you. 'You' may have lived many times, may have sent many 'yous' to reside on earth for a 'lifetime'. Each earth-you would have experienced and learned many things, all of which were/are relayed to the larger Mind via the physical brain. Bodies wear out and have a limited life, so it's imperative that the information gained by 'you' be transferred to your Mind, for filing, dissemination, storage, etc. This may explain why some people seem so much more 'advanced' than others, in terms of ability, etc. Some Minds may have simply learned more, or have more lives/experience in storage. This might account for child prodigies, geniuses, etc. It may explain what used to be termed 'idiot savants' (sorry, can't remember the current term right now).
It seems to me that our Minds may be the central storage/transmittors for several physical bodies simultaneously. If so, it would mean that several physical bodies (on this planet and elsewhere) are all tranmitting-to and tuning-into the same Mind at the same time. It could be seen as a 'cluster', all connected to the same Mind. Members of 'your cluster' could contain you, a grey alien, a Redwood tree, an old farmer in Africa, a dolphin -- not to mention people who lived 200 years ago or who will 'liive' 200 years into the future. This theory could explain how some people are able to see into the past, into the future (although they're probably all one) etc. I suspect our sleep-time is involved in all this.
And, if we pursue it further, who's to know if our Minds are not themselves part of a cluster connected to something larger? If pursued further again, we can see that eventually, all the Minds and Larger Minds merge/feed back into what ? ... the Universal Consciousness ... God ?
They say each of us is related to every 33rd person on the planet. I wouldn't be surprised to learn that we *are* actually all One. But like cells in a body or stars in a sky, we see and sometimes feel ourselves to be separate. The wise ones say separateness/individuality is just an illusion. Our egos support that illusion. Perhaps on this planet, in this lifetime, we are required to believe we are separate ... only to coalesce, rejoin, share, combine ... at the end of this life. Certainly, those who've astral travelled or experienced NDE's, speak of being freed from the ego, speak rapturously of joining pure love, acceptance, joy.
We're not 'born equal'. Some of us are dealt much easier/harder cards at birth. It makes sense (I'm sure we all deeply intuit this) that at some point there must be balance, fairness, release. In the meantime, we all struggle with our individual burdens, here in this lifetime, possibly all, from our different vantage points, contributing to something much more -- via our brains which transmit to our Minds which in turn relay it all to ...?