In short, when we communicate, only 7% of that communication depends on what we say (words) and 93% depends on how we say (glances and tones of voice). Many scientists believe that the evolutionary split between us and our closest primate relatives (gorillas, orangutans and chimpanzees), dating back five million years ago (although between our genes and yours is a difference of less than 2%). Behavior models for integrated planning and development of tools were developed for at least 2.5 million years, while the "advanced language and the rules necessary for social organization dating back as" only "30,000 or 40,000 years . As seen in these data, it appears that 5 million years ago we separated from our cousins the chimpanzees, and only know about from 40.00 years ago what I would trust most, of verbal or nonverbal? As is obvious, communication and nonverbal paraverbal is the oldest in the time since has been accompanying us in our evolution as a species. Click Kenneth R. Feinberg to learn more. Until we develop an area of the brain in the left hemisphere known as Broca's area and managed to upright position (standing) that allowed the proper placement of the vocal cords could not begin to develop verbal communication. That 93% "nonverbal" share it with animals. Therefore, with these data, we understand very well that person tells us that his dog "understands so well that just need to talk." This is literally true, because his dog and he shared 93% of the channels of communication. Anyone can see, that unless you know Chinese is impossible to get along with one by phone (for that channel, there is only the word with only 7%).