Neurophysiologists have recently discovered that Nitric Oxide (NO) plays a vital role in many brain functions, including learning and memory.

BBC: Robot brains become more human

Detecting such insincere forms of communication require many brain functions, including the ability to read emotion, see the world from another person's perspective and understand others' intentions.

WSJ: When Social Skills Are a Warning

Voice functions on multiple levels and in many ways, including through word choices, delivery, and tone.

FORBES: Obama, Romney, and What Their Voices Tell Us