The color-in-context theory and ecological valence theory suggest that color preference depends on the context and ecological object that define the psychological meanings of colors. The present study was conducted to identify the preference for the color red in national flags across the world. We explored 192 national flags across the world and found that red was the most frequently used color. Through a systemic examination of symbolic meanings behind use of the color red in flags, it was also found that the color red was often attached with an aggressive connotation. In contrast, the flags of the selected international collaborative organizations did not appear to prefer red. These results support the hypothesis of "red flag preference" in realworld competitive contexts. Limitations and future research directions are also discussed.
K E Y W O R D Scolor preference, competitive context, ecological object, red
| I NT ROD UCTI ONHuman color preference has some consistency. Earlier research has calculated the average ranking of humans' favorite colors across cultures as follows: blue, red, green, violet, orange, and yellow. 1 This sequence depends on certain conditions, such as hue, saturation, lightness, contrasting color, and the object to which that the color attaches. [2][3][4][5] These studies have explored color preference and related factors, but have not provided any theoretical explanation for its basis.The ecological valence theory considers color preference as an adaptation. 6 Organisms approach preferred colors and avoid displeasing colors because these colors are attached to some typical ecological objects that are vital to the organism's reproductive success. For example, people might like the color blue because it is associated with clear skies and clean water and dislike brown because it is associated with feces and rotten food. Thus, the preference for blue will facilitate individuals to interact with blue ecological objects (e.g., clean water) and benefit from them.The color-in-context theory suggests that human reactions toward a given color depend on context, which determines the psychological meaning associated with the color. For instance, red is associated with aggression in competitive contexts (e.g., a sports contest) and associated with sex in affiliation contexts (e.g., dating). 7 Therefore, in competitive contexts, primates, 8,9 including human beings, 10 avoid red stimuli. However, in affiliative contexts, animals 11,12 and human beings 13,14 will approach red stimuli.The ecological valence theory and color-in-context theory are both evolutionarily informed theories, though they are characterized by different frameworks. The ecological valence theory emphasizes that typical associations between objects and colors determine color preference, whereas color-in-context theory additionally proposes that context moderates this effect as a result of contextual psychological meanings. Therefore, a discussion of color preference must consider both the ecological object and the context....