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In the Basic Reaction Time Experiment, you measured your reaction time to the presentation of stimuli without having to make any kind of discrimination or choice. In the following experiment, you will add the element of choice. The basic notion of choice reaction time has bearing on interface design and, as was mentioned before, human factors engineering. If the relationship between a set of stimuli and possible responses is in some way a 'natural' one, then response time wil be fast; if it is not natural - that is if one has to process more information in order to make the proper response - then reaction time will be slower. Understanding what constitutes 'natural' in particular circumstances impacts the design of environment and human/machine interaction: from the design of a stovetop to the design of an airplane cockpit.