For Harris and Trump, facial expressions did much of the talking during presidential debate

Kamala Harris and Donald Trump said as much with their faces as they did with their words during Tuesday’s debate

Kamala Harris and Donald Trump said as much with their faces as they did with their words during Tuesday's debate.

With their microphones muted unless it was their turn to speak, according to the debate rules, body language took on outsized importance for Harris and Trump

Harris in particular leaned into the nonverbal communication, keenly aware that her every reaction was being broadcast to the world, “speaking” to the audience even while Trump ostensibly had the floor. Networks showed a split screen with both candidates for most of the debate.

At various points she looked amused or befuddled by whatever Trump was saying, as if w ordlessly saying he was lying. A few times she dramatically put her fingers under her chin, eyes wide, head tilted. Other times she laughed.

Trump sometimes scowled, sometimes smiled curtly. His eyes flashed anger or annoyance, perhaps even boredom at times. He rarely looked at Harris while she spoke, instead pointing his face forward toward the cameras or ABC News moderators.

When the candidates did have the floor, Trump and Harris both gesticulated with their hands, mannerisms that are by now familiar to Americans who've spent a lot of time watching them.