healing with light part 02

This is basic information on optogenetics with animation:

2008 lecture by one of the pioneers in the field, Professor Karl Deisseroth:

Professor Deisseroth goes a little deeper into it in 2015 with recent research:

and a paper:

Targeting Neural Circuits

Healing with light.

It's well known that people who live in the north, where the winters are long and dark, are more at risk for depression.  Here's an interesting paper on the use of optogenetics for treatment of depression.

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3868662/