... to dissimilar stimuli. This was a one tailed hypothesis. The null hypothesis was: There will be no difference in the time taken by participants to complete a dual-task that requires responding to similar stimuli than a dual-task that requires responding to dissimilar stimuli. Method Design The experiment employed a between-participants design. Participants were asked to carry out two tasks at the same time (dual-task) - the tasks were selecting a particular type of word from a list, while answering mathematical questions verbally. The independent variable was the type of words that the participant had to select (by placing a tick) from a list. There were two conditions - in the first, participants were asked to place a tick next to words which were the name of a colour. This was the control condition, requiring two dissimilar responses. In the second, participants were asked to place a tick next to words which were numbers. This was ...

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