I was just introduced to http://www.infoplease.com and think it is an interesting place to find things.
I clicked on the 'Color' link: http://www.infoplease.com/spot/colors1.html and found this - - -
Yellow
Cheerful sunny yellow is an attention getter. While it is considered an optimistic color, people lose their tempers more often in yellow rooms, and babies will cry more. It is the most difficult color for the eye to take in, so it can be overpowering if overused. Yellow enhances concentration, hence its use for legal pads. It also speeds metabolism.
That is cool, I am off to find a yellow paint for my world. . . 
Pat, The Avid Embroiderer
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