- Red: improves performance on detail-oriented tasks
- Blue: stimulates creativy
The article goes on to discuss underlying causes. Stressful colors like red might enhance effectiveness of getting things done. Blue "calm" colors are better for coming up with that brilliant idea.
Regardless of whether these type of studies are right or not: picking a color scheme for your company look and feel (and/or your PowerPoint presentation) is a far more important decision than deciding the graphics of your logo.