But if we are talking about "there's there there", then I am not sure if we will ever find an explanation for this. Let's say that X is what gives rise to "there's there there". What does this tell me? Nothing.
This is perhaps the most interesting, most important, and most baffling mystery of the universe. It requires no equipment other than one's own mind. Esoteric contemplatives have spent millenias on this and none of them have the answer to the ultimate question.