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