5 Signs You're More Likeable Than You Think | Psychological Facts

Researchers had 72 men and women work on a task with a partner. The partners (who worked for the researchers) either mimicked the other participant's behaviour or didn't, while researchers videotaped the interactions.

At the end of the interaction, the researchers had participants indicate how much they liked their partners.

Sure enough, participants were more likely to say that they liked their partner when their partner had been mimicking their behaviour.