High Quality Content by WIKIPEDIA articles! "Question book-new.svg This article needs additional citations for verification. Please help improve this article by adding reliable references. Unsourced material may be challenged and removed. Photographs from the 1862 book Mecanisme de la Physionomie Humaine by Guillaume Duchenne. Through electric stimulation, Duchenne determined which muscles were responsible for different facial expressions. Charles Darwin would later republish some of these photographs in his own work on the subject, which compared facial expressions in humans to those in animals. A facial expression results from one or more motions or positions of the muscles of the face. These movements convey the emotional state of the individual to observers. Facial expressions are a form of nonverbal communication.

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