Scientists at UC Davis in US have come up with a solution to teach robots to follow a leader by using behavioral cues. Usually robots have trouble following a leader when the leader disappears out of sight. The robots that are enabled with behavioral cue detection have performed with much more success in predicting and following the movements of a leader entity. For more click the link below:

Reference: www.spacedaily.com/reports/Robots_Learn_To_Follow_999.html