Red stimulates the senses and raises blood pressure, putting the brain in a high-alert state that deteriorates productive thinking. Studies have shown that people spend more money and make less informed decisions near red light, and that sports teams and fighters wearing red perform better than those wearing other colors. Blue light has a waking effect and increases cognitive thinking, relaxing the brain. Pink has been shown to weaken human performance and aggression through its calming effects. Black attracts less attention to covered areas.