Running head: THE EYES HAVE IT The eyes have it: Making positive expressions more positive and negative expressions more negative Daniel S. Messinger and Whitney I. Mattson University of Miami Mohammad H. Mahoor University of Denver Jeffrey F. Cohn University of Pittsburgh and Carnegie Mellon University Author Note Daniel S. Messinger, Departments of Psychology, Pediatrics, and Electrical and Computer Engineering, University of Miami; Whitney I. Mattson, Department of Psychology, University of Miami; Mohammad H. Mahoor, Department of Electrical and Computer Engineering, University of Denver, Jeffrey F. Cohn, Department of Psychology, University of Pittsburgh, Robotics Institute, Carnegie Mellon University. This research was the subject of a Master’s Thesis by Whitney I. Mattson. The research was supported by grants from NIH (R01HD047417 and R01MH051435), NSF (INT-0808767 and 1052736), and Autism Speaks. Correspondence should be addressed to Daniel S. Messinger, University of Miami, Flipse Psychology Annex, P.O. Box 249229, Coral Gables, FL 33124. E-mail: dmessinger@miami.edu