Scientists Project Holograms Into The Brain To Create Experiences:
https://www.forbes.com/sites/andreamorris/2018/04/30/scientists-project-holograms-into-the-brain-to-create-experiences/
Editing brain activity with holography: https://news.berkeley.edu/2018/04/30/editing-brain-activity-with-holography/
Activating brain cells with holography: