In Chris Voss’ negotiations book: Never Split the Difference…

In Chris Voss’ negotiations book: Never Split the Difference, one of the tips is: “Follow the 7-38-55 Rule.” This rule was created by a UCLA Psychology Professor. Based on his studies, he found out that only 7% of the message is conveyed with Words, 38% is with the Tone of Voice, and 55% is with _____________.