When your palms are up, it signals honesty and engagement. The limbic brain picks up the positivity, which will make the interviewer comfortable, Wood says.
"It’s one of the reasons we shake hands, to show the open palm," Wood says. "It’s so tied to survival instincts ... If we don’t see open palm gestures, it puts us on our guard."
In general, upward-facing body language, such as open palms, smiles and straight posture, also makes you look energetic, Glass says.