Research finds birdsong trigger

BBC NEWS | UK | Scotland | Edinburgh, East and Fife | Research finds birdsong trigger: "Birds know to sing in the spring because of hormones triggered by longer days, researchers have found."

Chemical pathways for communication between cells and subsystems have evolved for billions of years before electrically-induced neural networks arose. Understanding the chemical pathways in the brain will prove at least as important, if not more important, than understanding the electrical pathways.