What is it that compels human beings to go "aww" at something we perceive to be cute or endearing? Or to make a "mmmmm" sound if something tastes or feels good?
Is this a learned behavior that eventually became hardwired into our brains over generations? Or is it a kind of human "purr" that we've always had?
If we can hard wire noises into our basic make up over time, could we do the same with silence?