text: Second,"Most human communication is nonverbal, including emotional communication," notes Dr. Huang. "So computers need to understand that, too." Your home PC can't handle the complex algorithms used to decode Mona Lisa's smile. But we can write down some simple instructions that "encode" different emotions. Eckman has classified six basic emotions- happiness, surprise, anger, disgust, fear, and sadness- and then associated each with characteristic movements of the facialc muscles.