Defending against a penalty kick is one of the most difficult tasks a goalkeeper can face. Some decide which way they will dive beforehand, giving themselves time to reach the side of the goalmouth. A 2011 study published in the journal "Psychological Science" found goalkeepers dived to the right 71% of the time when their team was losing, but only 48% when ahead and 49% when tied, a phenomenon believed to be related to certain right-preferring behaviour in social mammals. Others try to read the kicker's motion pattern. Kickers may attempt to feint, or delay their shot to see which way the keeper dives. Shooting high and centre, in the space that the keeper will evacuate, carries the highest risk of shooting above the bar. If a keeper blocks a penalty kick during a match, there is a danger the kicker or a teammate may score from the rebound; this is not relevant in the case of a shoot-out.