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Could this be the explanation for aura's?
And as a second possible explanation, perhaps for all the kyrlian stuff:
When emotions make you see colors
It's easy to dismiss such claims as pseudoscientific claptrap, yet there exist humans who, when presented with nonvisual stimuli such as tastes or smells, perceive visual imagery. I'm talking about the scientifically recognized condition, synesthesia.
Might it also be possible for a synesthete to associate emotions with visual images? British psychologist Jamie Ward believes he has found an individual (a nineteen-year-old woman whose initials are GW) with just such a condition. GW says she perceives "auras" around the faces of certain people, and when she sees or hears some words, she perceives colors (the same color always associated with the same word), which occupy her entire field of vision.
Ward points out that several other studies have shown a similar correspondence between color and emotion -- people tend to associate lighter and more saturated colors like yellow, green, and red with positive emotions, and darker and less saturated colors with negative emotions.
http://scienceblogs.com/cognitivedaily/2006/03/when_emotions_make_you_see_col.php [Broken]
And as a second possible explanation, perhaps for all the kyrlian stuff:
Human Hands Emit Light
Human hands glow, but fingernails release the most light, according to a recent study that found all parts of the hand emit detectable levels of light.
The findings support prior research that suggested most living things, including plants, release light. Since disease and illness appear to affect the strength and pattern of the glow, the discovery might lead to less-invasive ways of diagnosing patients.
http://dsc.discovery.com/news/briefs/20050905/handlight_print.html
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