 Some studies have demonstrated that students who received social-comparison praise (e.g., "you're doing better than most students" or "you're performance is amongst the best we've had") demonstrated greater motivation compared to no-praise or other control groups.Sarafino, Russo, Barker, Consentino and Titus found that students who received social-comparison voluntarily engaged in the task more so than those who received feedback that they performed similar to others.Though these studies demonstrate the possible positive influence of social-comparison praise, they have been criticized for inadequate control groups.