Miller et al., 1975, Study 2: Receiving positive performance feedback improved math grades among 2nd grade students
Miller, R. L., Brickman, P., & Bolen, D. (1975). Attribution versus persuasion as a means for modifying behavior. Journal of personality and social psychology, 31(3), 430.Download PDF
2nd graders told by teachers and the school principal they were very good at math or that they worked very hard at math, as compared to those encouraged to be good at math or to work hard at math, performed better on a math test two weeks later.