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In this lab you will observe the Stroop effect in order to explore attention–a mental activity that allows your cognitive processes to take in and survey selected areas of your surroundings. One specific type of attention is selective attention, which is when people are instructed to respond to certain kinds of information while ignoring other information. The Stroop effect was first described by J. R. Stroop in 1935 when he found that naming the color of squares took a significantly shorter amount of time than naming the ink color of color name words when they did not match. What type of processing conflict is responsible for this phenomenon, and is it altered when people perform the task while standing up?