In their first experiment, 58 undergraduates with an average age of 20 were randomly assigned to two scenarios. Either wearing or not wearing a lab coat.[1] Participants then completed a Stroop Test, where colour words are written in different colours, to measure selective attention.[3] The first experiment consisted of 50 randomised trials with 20 being incongruent and 30 non-incongruent. Participants were asked to do this as fast as possible.[1] This tested their selective attention abilities which is to concentrate on relevant stimuli while disregarding irrelevant stimuli.[3] The results of this first experiment illustrated that participants wearing a lab coat made half as many errors than participants who wore their own clothing on incongruent trials.[1] The amount of errors was the same in both groups on non-incongruent trials and there was no variation in the time completing the task in the different conditions.[1] The experiment exhibited how physically wearing a lab coat can increase selective attention on a Stroop task.[1]