Like most teenagers in suburbia I took a driver’s education class shortly after I earned my learner’s permit. Though I picked up critical driving tips, and got plenty of practice in the driver’s seat, one of the most interesting facts I learned concerned car insurance and the color red. According to my teacher, drivers with red cars had to pay higher insurance rates. Apparently this was due to the fact that people in red cars were more likely to speed. I’ve since learned that the relationship between red and speeding is actually a pervasive urban legend. Nevertheless, it piqued my interest in the association between color and behavior. Though red might not be associated with speeding, it has been found to relate to a variety of psychological processes and outcomes in both humans and non-human primates including dominance, competitive sports outcomes, achievement, and sexual attraction.
Dominance, Aggression, and Sports
There is a large body of animal research showing that red coloration is related to testosterone levels and by extension to dominance and aggressive behavior – a signal that members of the species use to guide their actions. In one recent study, for example, researchers evaluated whether wild male rhesus macaques (monkeys) would be less likely to steal food from a human researcher if the researcher was wearing red. According to their hypothesis, red clothing signals that the human is dominant and aggressive, and therefore the monkey would be more hesitant to steal from or challenge them. The study was conducted on Cayo Santiago – a small island in Puerto Rico that is home to a large population of free-ranging rhesus macaques. Two experimenters would locate a male monkey, approach him together, take out a plate with a slice of apple on it, and then step away once it was clear the monkey saw them. The monkey could then approach and steal the apple from one of the experimenters. One experimenter wore a red shirt, and the other wore either a green or blue shirt. Across conditions the monkeys disproportionately stole from the experimenter NOT wearing red – even if the “red” experimenter was female (~70% of the time).
This research followed from a wildly publicized study in 2005 evaluating a somewhat similar process in humans. The researchers followed contestants in combative sports, including boxing, tae kwon do, and two types of wrestling, in the 2004 Olympics. These contestants were randomly assigned to either wear red or blue uniforms during the games. The researchers found that contestants wearing red were significantly more likely to win their matches. This was especially the case when the two competitors were relatively equal in ability (red gave them an extra nudge). Similar results were found with teams assigned to wear red in an international soccer tournament in 2005. The researchers argued these results are due to an evolutionary history – in which red coloration was related to testosterone levels and by extension dominance. In this way, it became a cue regarding which male would win a competition – a cue still used by humans today. How exactly this process operates, however, is still unclear. Is the competitor wearing red more confident or their opponent more intimidated? Other researchers have argued that the effect has to do with the referees’ biases. For example, referees were found to give more points to tae kwon do competitors wearing red than to those wearing blue, even when the performances were identical. Whatever the reason, the effect is there, and should be considered in high stakes competitive sports.















