As I have said before, I think you are obsessing about calcium. I don't know anything more about calcium other than to use vitamin supplementation to help the body maintain a balance.

Good luck finding somebody to do the SPECT and then find somebody who even has a clue about the results. The same goes for fMRI.

In the US, if you have $10,000 or so, you can go to an Amen Clinic and get the whole protocol.

If your neck is a problem, it can cause brain stem inflammation that can disrupt many functions, including sleep, vestibular and more. Poor sleep can reduce oxygen use in the brain.

The research you are reading is likely focused on finding an issue that appears to be out of the norm and then develop an expensive drug to correct that issue while causing side-effects than require more drugs.......wash, rinse, repeat.

Or, it is just somebody who needs to write a thesis or other research report to get published.