The brain is unbelievably complicated, which is both daunting and fascinating for neuroscientists like me. In the space of a cubic millimeter – about the size of a single poppy seed – there are tens of thousands of neurons and other brain support cells, all influencing each other’s function.
How do neuroscientists make sense of this complexity? And how did they get to the point where they could simply shine different colors of light on the brain to control neuron activity?
