I participated in early work in optogenetics in larger brains, and Karl was my postdoc adviser. He is a deeply thoughtful and generous scientist. His book Projections unpacks some of his thinking as to how these tools may unravel and treat a panel of psychiatric conditions. The company MapLight he started is working to make these treatments a reality via ongoing clinical trials https://maplightrx.com/pipeline/
https://www.centerwatch.com/clinical-trials/listings/NCT0511...
https://www.entandaudiologynews.com/features/ent-features/po...
The lectures themselves were, unfortunately, quite boring. This was the introductory course for freshmen, covering a lot of material that students ought to have learnt in school already. Much of the time, the professor appeared to be as bored by it as many of the students were, but I guess it had to be done and someone had to do it...
Looking at the basic science results I could not decide if they were bringing in really novel understanding or basically repeating a lot of the old electrical stimulation results.
I do remember a staggering amount of money was pumped into the field and it was super trendy in the 2010s.
Also, just like with CRISPR, there were others thinking along the same lines at the same time, but who didn't get the high profile publications: https://www.scientificamerican.com/article/he-may-have-inven...
(To be clear, since it's probably necessary, I'm asking a curiosity-driven question about the mechanism here, not throwing shade on the work. Given it's won the researchers a Nobel prize it's obviously highly significant.)
Ahead of time, you either use viral tools or other genetic modifications to make specific cell types express the photorecrptor.
*there is an effect of light/heat that all cells are subject to, and good experiments try to control for this as best they can
From my understanding, this discovery is on the level of what transistors were for electronics - unlocking a completely new way to understand and design the electronic circuits, which later on enabled the rise of computing.
Since compared to biology our computing is still highly primitive, it seems like next step in compute power will be biological and quantum computing.