Infant behavior is viewed in a social-communicative context centered on the phenomenon of spontaneous communication. Symbolic communication is learned and culturally structured, intentional, consists of symbols, and is propositional in content. In contrast, spontaneous communication is innate in both its sending (display) and receiving (preattunement) aspects, non-intentional, consists of signs, and is non-propositional or emotional in content. It underlies infant imitation, interactional synchrony, primary intersubjectivity, emotional empathy, and mirror neurons; and it is associated with oxytocin.