What is the main idea of the stroop effect?

The brain's reaction time slows when it must deal with conflicting information.

Explanation:

Just took a psych test, this is the correct answer.

The main idea of the Stroop effect is that the brain identifies colors more readily than words (reading words was a lot easier than reciting their color). This phenomenon occurs when person must say the color of a word but not the name of the word. Psychologists use this effect to understand how the brain evaluates information.