From the moment we are born (and, in fact, even before that), we are immersed in a world that constantly bathes us in the vibrations of sound waves. Through those terminals of perception we call our ears, these waves are transported to our brains, where we process them into what we call “sound.” Our inborn reactions to audio input have evolved over millennia to aid us in survival and socialization. These reactions are also incredibly important to understand when you are attempting to create engaging interactive media.