[trombonechamp]

FYI, similar technology is already mature and commercially available, e.g., through Inscopix (no affiliation): https://www.inscopix.com/nvista Looks like the innovation here is getting reliable and lightweight two-photon recordings (allowing more cells and multiplane acquisitions) while the animal is moving around. Still very cool!

And responding to the other commenters, no, this kind of technology is definitely not (and never will be) a toy...