So we can couple distant quantum systems via sound waves

https://phys.org/news/2019-02-quantum_1.html

http://schusterlab.uchicago.edu/static/pdfs/Whiteley2018.pdf

and we now know that extracellular charge diffusion in the brain (known about since forever, see e.g. review in https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6276723/ ) can leap across fairly big gaps

https://www.sciencealert.com/neuroscientists-say-they-ve-found-an-entirely-new-form-of-neural-communication

https://physoc.onlinelibrary.wiley.com/doi/full/10.1113/JP276904

My mind can’t help but wander to Matthew Fisher’s hypothesis on coupled spins of phosphorus atoms (e.g. contained in Posner molecules) possibly serving as a foundation for quantum cognition…

https://www.quantamagazine.org/a-new-spin-on-the-quantum-brain-20161102/

Could slow quasi-periodic electrical waves in the brain help bind together distant Posner molecules, enabling the quantum coupling that Fisher hypothesizes?

Hmmm…

So much still unknown about both the brain and macroscopic quantum mechanics…