When we think about communication, we most often focus on how we exchange information using words. While verbal communication is important, humans relied on nonverbal communication for thousands of years before we developed the capability to communicate with words. Nonverbal communication is a process of generating meaning using behavior other than words. Rather than thinking of nonverbal communication as the opposite of or as separate from verbal communication, it’s more accurate to view them as operating side by side—as part of the same system. Yet, as part of the same system, they still have important differences, including how the brain processes them. For instance, nonverbal communication is typically governed by the right side of the brain and verbal, the left. This hemispheric distinction has been clearly evidenced, as people who suffer trauma to the right side of their brain lose the ability to recognize facial expressions but can still process verbal communication. Conversely, people whose left hemisphere of the brain is damaged lose the ability to speak, read, and understand language. Interestingly, a person with damage to the left hemisphere of the brain who loses the ability to speak can often still sing since the creation, but not the reading, of music is governed by the right brain. The content and composition of verbal and nonverbal communication also differs. In terms of content, nonverbal communication tends to do the work of communicating emotions more than verbal. In terms of composition, although there are rules of grammar that structure our verbal communication, no such official guides govern our use of nonverbal signals. Likewise, there aren’t dictionaries and thesauruses of nonverbal communication like there are with verbal symbols. Finally, whereas we humans are unique in our capacity to abstract and transcend space and time using verbal symbols, we are not the only creatures that engage in nonverbal communication. These are just some of the characteristics that differentiate verbal communication from nonverbal, and in the remainder of this chapter we will discuss in more detail the principles, functions, and types of nonverbal communication and conclude with some guidance on how to improve our nonverbal communication competence.
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