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In this study I examined whether or not the locomotor activity of a rat, as measured by the number of rotations in a rodent wheel and activity in the open field test, increased in the presence of combined taurine and caffeine, when compared to taurine or caffeine alone or control saline. As well as measuring activity, the open field test is also useful in evaluating anxiety, a potentially detrimental side effect of caffeine. Before stating the details of this experiment, research involving taurine and caffeine alone and in combination will be further examined.