title: [Yawning: a facial signal].
authors.affiliation: Dioartimento Psicologia, Seconda Università di Napoli.
authors.forename: Gianluca
authors.initials: G
authors.lastname: Ficca
authors.forename: Piero
authors.initials: P
authors.lastname: Salzarulo
mesh_terms: D005149:Facial Expression; D049672:History, 19th Century; D049673:History, 20th Century; D049674:History, 21st Century; D011584:Psychology / Q000266:history*; D015000:Yawning