That’s where context comes in. We’re constantly analyzing other people’s “body language,” facial expressions, and even the tone of their voice. As we watch, we take into consideration what just happened, what is currently happening, and what might happen next. We even consider what’s taking place inside our own bodies, Barrett emphasizes, and what we’re feeling, seeing, and thinking. Some people are better at this than others, and certain factors can influence your success in a given interaction. If you know someone well—if, through trial and error, you’ve come to understand the way their particular emotions might manifest—you’re more likely to interpret their scowl accurately.