http://www.npr.org/sections/health-shots/2014/02/21/280640267/how-dogs-read-our-moods-emotion-detector-found-in-fidos-brain

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Humans detect one another’s emotional states without body language because of a piece of brain neurologists call the “voice area” that is stimulated specifically when vocal sounds are heard. The brain filters out non-vocal noises like tapping and snapping and pays attention specifically to highs, lows, and the length of what’s being processed. It is located in the back of the brain behind the ears.

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