**Perceived Interracial Competition Scale:**
Murayama, K., & Elliot, A. J. (2012). The competition–performance relation: A meta-analytic review and test of the opposing processes model of competition and performance. Psychological bulletin, 138(6), 1035.
**The nine-item Everyday Discrimination Scale:**
Clark, R., Coleman, A. P., & Novak, J. D. (2004). Brief report: Initial psychometric properties of the everyday discrimination scale in black adolescents. Journal of adolescence, 27(3), 363-368.
**An eleven-item behavioral avoidance scale:**
Lackey, S. (2012). It takes two to tango: Stigma consciousness, intergroup anxiety, and avoidance of interactions between Blacks and Whites. ST. John's University (New York).
**Four items from a state affect measure were adapted:**
Amodio, D. M. (2009). Intergroup anxiety effects on the control of racial stereotypes: A psychoneuroendocrine analysis. Journal of Experimental Social Psychology, 45(1), 60-67.
**A six-item general trust scale was adapted into a four-item interracial trust scale:**
Yamagishi, T., & Yamagishi, M. (1994). Trust and commitment in the United States and Japan. Motivation and emotion, 18(2), 129-166.
