I really like these kinds of musings, because they spiral into some the very basic questions of philosophy - all the way down to: "I think therefore I am" type of stuff.
As Fran Lebowitz says in her opening line to a very popular video - "The closest thing to a human being is a book." You writing this - is the only way for one to actually confirm a shared experience.
I'm surprised you haven't mentioned 'qualia' in this blog - which address the specific and unique experience of experiencing something - such as a taste, or a color.
But I think, what makes us have a unified experience is the Gap in qualia - the fact that we're not fully aware of the fact that we are parsing information, but rather the shared blur of experiencing joy, excitement, revelation, or fear... I believe that our shared experience is not found in the details but rather in filling of the gaps between said details.
I have some reading to do, curse you :) How have I never heard of that term before? I read the wikipedia entry briefly, and well, what a phenomenon. This is where our shared experience diverges, and perhaps, will come back together again at a later point in time :)
To simplify, my spice tolerance might be different from yours. We can eat the same chilli (literally, cut it in half) and each have different reactions. Our reactions are physiologically the same, but our perception is what differs.
We fill the gap later.
I think?
Am I on the right track?
hahah - the rabbit hole of qualia!!! Somehow I connect this back to your "Construction Signs" post - "Mind the Gap" - the mind is individual, the gap is also perceived uniquely, but the collective "minding" is shared.
Does one neuron know another?