An empirical study was designed to investigate the effects of personality and sociocultural background on reactions to positive and negative performance feedback. Eighty college students of two sociocultural backgrounds (Mexican-and Anglo-American) were asked to work on a three-dimensional jigsaw puzzle and were then either praised or criticized, ostensibly according to their "problem-solving strategies," but actually on the basis of random assignment to either condition. Seven dependent variables were included, representing various reactions to the feedback. Four-way analyses of variance were conducted on each dependent measure with the independent variables being type of feedback, locus of control, sex of subject, and ethnicity. In addition to consistent main effects for feedback, the results revealed that reactions to feedback, particularly criticism, are often mediated by personality and/or sociocultural factors. The findings are discussed in relation to previous literature and the need to take a sociocultural perspective in psychological research is emphasized.One of the major shortcomings in the fields of personality and social psychology, particularly within die United States, has been a general failure of researchers to take ethnic or cultural variables into account. The result of this widespread myopia is that we are left with an essentiaUy ethnocentric body of literature, a unicultural science often limited in its generalizability to a very specific populadon: white Anglo-Americans. It is dmely to quesdon how weU our theories of personality and social psychology apply to nontradidonal populadons. The present study was 1.