Burt, D. M. (2002). Going to the other extreme! Investigating recognition of emotional expressions with anti-faces rather than caricatures. Perception, 31 (Supplement), 60.
Calder, A. J., Rowland, D., Young, A. W., Nimmo-Smith, I., Keane, J., & Perrett, D. I. (2000). Caricaturing facial expressions. Cognition, 76, 105-146.
Cohen, J. D., MacWhinney, B., Flatt, M., & Provost, J. (1993). Psyscope. Journal of Behavioral Research Method, 25, 257-271.
Ekman, P. (1993). Facial expression and emotion. American Psychologist, 48, 384-392.
Etcoff, N. L., & Magee, J. J. (1992). Categorical perception of facial expressions. Cognition, 44, 227-240.