International Affective Picture System (IAPS) is a database of photographs used in emotion research.
It was been developed by Lang since the late 1980s and work continues at NIMH Center for Emotion and Attention (CSEA) at the University of Florida.
Lang, P.J., Bradley, M.M., & Cuthbert, B.N. (2005). International affective picture system (IAPS): Affective ratings of pictures and instruction manual. Technical Report A-6. University of Florida, Gainesville, FL.