Possible interpretation:

If a team wants to do something smart together, the team members have to (a) communicate, or at least (b) be really good at guessing what the other team members are thinking.

First, their members contributed more equally to the team’s discussions, rather than letting one or two people dominate the group.

communication

Second, their members scored higher on a test called Reading the Mind in the Eyes, which measures how well people can read complex emotional states from images of faces with only the eyes visible.

mind reading