5. Color psychology is the study of how colors affect our emotions. Researchers are finding that colors can change our behavior in specific ways. For example, one research study showed that people could lift heavy weights more easily in blue rooms. Other studies have looked at how colors influence decisions. Soccer referees made more decisions against teams that wore black uniforms. Tae kwon do referees gave competitors in blue clothing higher scores than competitors in red . In another study, students who saw the color red before a test did much more poorly. Of course, these test results might vary from culture to culture.