This PowerPoint illustrates the fairly well known "Stroop Effect". Slides show color-words written in different colors and the task is to first read the word, and then to say the color. Let me know if you have any questions or suggestions, and a BIG BIG thanks for looking (as a full time practicing teacher, I KNOW how time consuming this process can be). ALL my postings are FULLY "classroom-tested" - before I publish, my lessons are tested by both myself and colleagues, rigorously evaluated and discussed, and continually updated to maximize their effectiveness. But there is always the possibility of error and room for improvement, so do please provide constructive feedback. Search words: starters, challenge, brain, stimulate, problem, mental, thinking, abstract