Yeah that's why I asked. On first thought it was "well yeah, it is their brain of course they own it". But then I could think of scenarios where imaging centers, doctors, hospitals, equipment manufacturers could get wierd about it.

I found a case in Canada, for example, about a hospital asserting ownership rights to a biopsy tissue sample.

Then remembered the DNA patentability case not too long ago as well:

https://en.wikipedia.org/wiki/Ass'n_for_Molecular_Pathology_....