The present field experiment examines the effect of self-awareness on adult perspective-taking and on prosocial behavior. University students at an Italian university were interviewed briefly on their campus, and for half of them self-awareness was induced by asking them to hold a mirror before their faces. In the same context they then had to choose between a postcard written in Italian and 1 written in English, to be sent to England. This led to a measure of perspective-taking, and their actual readiness to mail the postcard was taken as an index of prosocial or helping behavior. Both perspective-taking and helping behavior were boosted considerably by self-awareness.
SCAFFIDI ABBATE, C., ISGRO', A., WICKLUND, R., & BOCA, S. (2006). A field experiment on perspective taking, helping, and self awareness. BASIC AND APPLIED SOCIAL PSYCHOLOGY, 28, 283-287.