How people are affected by different color stimuli varies from person to person. Blue is the top choice for 35% of Americans, followed by green (16%), purple (10%) and red (9%). A preference for blue and green may be due to a preference for certain habitats that were beneficial in the ancestral environment as explained in evolutionary aesthetics. The colors orange, yellow, and brown, are the three least popular colors, respectively. Color preference may also depend on ambient temperature. People who are cold prefer warm colors such as red or yellow while people who are hot prefer cool colors like blue and green. Introverted individuals are also found to be more attracted to cool colors, while extroverts prefer warmer colors. Gender has also shown to influence how colors are received, with some research has suggesting that women and men respectively prefer "warm" and "cool" colors. Black, white, and gray are also shown to be received more positively by males than females. Psychologist Andrew J. Elliot tested to see if the color of a person's clothing could make them appear more sexually appealing. He found that, to heterosexual men, women dressed in the color red were significantly more likely to attract romantic attention than women dressed in any other color. The color did not affect heterosexual women's assessment of other women's attractiveness. Other studies have shown a preference for men dressed in red among heterosexual women. Contrary to the unanimous adult preference for blue, in children the color yellow is the most favored color, perhaps owing to its associations with happiness. However, children's preferences for colors they find to be pleasant and comforting are mutable and can vary, while adult color preference is usually non-malleable. Cultural background has been shown to have a strong influence on color associations & preference. Studies have shown that while people from the same region regardless of race will have the same color preferences, common associations connecting a color to a particular emotion may differ cross-culturally. For instance, one study that examined color associations with emotion with participants from Germany, Mexico, Poland, Russia, and the United States found that in all nations the color red was associated with anger and was perceived as strong and active. However, only Poles associated purple with both anger and jealousy while Germans associated jealousy with yellow, highlighting how the influence of different cultures can potentially change perceptions of color and its relationship to emotion. Light and color can influence how people perceive the area around them. Different light sources affect how the colors of walls and other objects are seen. Specific hues of colors seen under natural sunlight may vary when seen under the light from an incandescent (tungsten) light-bulb: lighter colors may appear to be more orange or "brownish" and darker colors may appear even darker.