Final answer:
The claim that nonverbal gestures cannot substitute for verbal messages is false. Nonverbal communication can convey significant information and varies across cultures, underlining the importance of understanding cultural norms to interpret gestures properly.
Step-by-step explanation:
The statement that gestures that are nonverbal and not part of an organized sign language cannot substitute for a verbal message is False. Nonverbal gestures can often convey messages and substitute for verbal communication to a large extent. For example, a smile often denotes happiness, and a wave can signify 'hello' or 'goodbye.' While these gestures can vary in meaning across cultural contexts, they are integral in conveying messages without using spoken language.
Nonverbal communication is symbolic and embodies a variety of gestures and body language, such as a thumbs-up or a wink, which carry different meanings across different cultures. For instance, a thumbs-up gesture is positive in the United States but considered offensive in Russia and Australia. Furthermore, someone's posture or facial expression can give clues to their mood or the nature of their conversation, indicating whether it's serious or lighthearted.
Nonverbal signals are a crucial aspect of communication and can sometimes be more powerful than words. They help us interpret messages based on a shared set of cultural norms and practices. While some nonverbal gestures are nearly universal, others are learned and interpreted through the lens of one's culture.