There are several ways to think about what might constitute the sixth sense. Because there’s a lot of stuff that we equipped to detect— electrical fields, magnetic fields, ultra-low frequencies, ultra-high frequencies, and infra-red to name a few off the cuff. Our brains are amazing sense-making hacks, and there (as far as I know) are multiple layers of mind “running” at the same time. We are literally swamped with information through so many mediums, and our brain is continuously and completely embodied into that information. Doesn’t it actually make more sense that we have “this vague sense that…” for any sixth-sense sort of experience we describe? What’s the alternative? …to have a myriad of explicit sensations that we only very rarely encounter? I think it makes more sense for to have a “vague feeling of…” as a way to experience the other, less-experienced parts of our physical abilities.

A hidden sense of smell might account for the mysterious sixth sense and a universe of subtle knowledge about the world.

~ Elizabeth Preston from, How our sense of smell works as a mysterious sixth sense | Aeon Essays

The question I have—sorry, I always have questions, never answers—is: Now that I know that my sense of smell is better than I thought it was, does that mean that my sixth sense improves? (In the same way that walking around barefoot eventually improves your ability to balance without having to actually work on that skill.)

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