Fear includes physiological responses like increased heart rate and changes in blood flow, as well as cognitive components.

“And it is hotly debated nowadays. And it's been hotly debated really for centuries what an emotion is and what an emotion isn't. Now that's not a debate that I want to get into today. I think it's fair to say that emotions include responses within our body. Quickening of heart rate, changes in blood flow, things that we experience as a warming or a cooling of our skin. But that there's also a cognitive component. There are thoughts, there are memories. There's all sorts of stuff that goes on in our mind and in our body that together we call an emotion.”