Brain teaser: Stroop effect

I’m still away on vacation, but I wanted to leave you with my weekly “brain teaser” posting.   This week’s teaser is known as the Stroop effect.

Try to say the color of the words below, instead of actually reading them. You may find it surprisingly difficult, because the right half of your brain is trying to say the colors, while the left half is trying to say the word. This tests a person’s ability to concentration.