Spontaneous laughter is produced by the coordinated contraction of 15 facial muscles in a stereotype pattern and accompanied by altered breathing. The following is a description abridged from Sally's classic essay on the subject:
"Smiling involves a complex group of facial movement. It may suffice to remind the reader of such characteristic changes as the drawing back and slight lifting of the corners of the mouth, the raising of the upper lip, which partially uncovers the teeth and the curving of the furrows betwixt the corners the mouth and the nostrils (the naso-labials furrows). To these must be added the formation of wrinkles under the eye, which is a further result of the first movement, and the increased brightness of the EYES.
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