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PHYLOGENY & NONVERBAL BEHAVIOR. LINES OF ARGUMENT. SENSORY DEPRIVATION STUDIES NONHUMAN PRIMATE STUDIES MULTICULTURAL STUDIES TWIN STUDIES NEONATE STUDIES. FACIAL EXPRESSIONS AND NONHUMAN PRIMATES. SIMILARITIES IN HUMAN & NONHUMAN PRIMATES. SIMILAR ACTIVITIES STIMULATE EXPESSIONS
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LINES OF ARGUMENT • SENSORY DEPRIVATION STUDIES • NONHUMAN PRIMATE STUDIES • MULTICULTURAL STUDIES • TWIN STUDIES • NEONATE STUDIES
SIMILARITIES IN HUMAN & NONHUMAN PRIMATES • SIMILAR ACTIVITIES STIMULATE EXPESSIONS • FACE ACCOMPANIED BY CUES IN OTHER BODY REGIONS • SAME DISPLAY DECODED DIFFERENT WAYS IN DIFFERENT CONTEXTS • SIMILARITIES IN BRAIN REGIONS MEDIATING EMOTIONAL RESPONSES
ORIGINS OF SMILING & LAUGHING • BARING TEETH SIGNALED FEAR AND/OR FLIGHT • BARING TEETH BY DOMINANT ANIMAL WHEN CONFRONTING A NONDOMINANT ONE MEANT “NONHOSTILITY”
GRADUALLY, NONHOSTILITY BECAME FRIENDLINESS IN THE HUMAN SMILE • LAUGHTER IS DERIVED FROM THE “PLAY FACE”
IMPORTANCE OF FACIAL DISPLAYS TO NONHUMAN PRIMATES SHOWN WHEN FACIAL MUSCLES SEVERED
ENTIRE SEQUENCES OF NONVERBAL BEHAVIOR MAY ALSO BE TRACED TO THE BEHAVIOR OF NONHUMAN PRIMATES
LINES OF ARGUMENT • MULTICULTURAL STUDIES • TWIN STUDIES • NEONATE STUDIES