Why do we do the things that we do? Why do we sometimes choose to be loving parents and other times engage in irrational self‐destructive behaviors? What drives us to sometimes be altruistic and other times make decisions that really threaten our very survival? Well, the answer lies in our brains. Our brains evolved to ensure that we repeat behaviors that will lead to our survival.
The key molecule of optogenetics is a light‐sensitive protein called channelrhodopsin, which is extracted from green algae. Scientists can insert channelrhodopsin into memory cells. Subsequently, scientists can even activate these with blue light which they deliver deep inside the brain with optic fibers.