Ключевые слова: adult, anatomy, arm, attention, background, body, caucasian, clean, clear, communication, display, elbow, expression, extension, fingers, five, forearm, gesture, grey, hand, index, interaction, isolated, joint, knuckles, language, nonverbal, offering, open, palm, participation, person, presenting, question, raised, reaching, showing, sign, signal, simplicity, skin, speak, stop, thumb, unidentifiable, upraised, vertical, visible, volunteering, wrist,