Psychology: Red enhances human performance in contests

@article{Hill2005PsychologyRE,
  title={Psychology: Red enhances human performance in contests},
  author={Russell A. Hill and Robert A. Barton},
  journal={Nature},
  year={2005},
  volume={435},
  pages={293-293}
}
Red coloration is a sexually selected, testosterone-dependent signal of male quality in a variety of animals, and in some non-human species a male's dominance can be experimentally increased by attaching artificial red stimuli. Here we show that a similar effect can influence the outcome of physical contests in humans — across a range of sports, we find that wearing red is consistently associated with a higher probability of winning. These results indicate not only that sexual selection may… 
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Is red an innate or learned signal of aggression and intimidation?
Red coloration has been associated with dominance and aggression in a number of animals. However, it is unclear whether the increased aggression of red individuals or the avoidance of red opponents
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