The effects of the complexity of stimuli on reaction times in double stimulation tasks were investigated within the concept of cognitive capacity allocation. The results showed that the complexity of the first stimulus (S1), and the complexity of the second stimulus (S2), and their interaction terms had significant effects on reaction time to S1 (RT1), and reaction time to S2 (RT2). An increase in RT2 (and RT1) was observed when the complexity of S1 and/or the complexity of S2 increased. However, the increase in RT2 due to the increase in the complexity of S1 was greater than the increase in RT1 due to the increase in the complexity of S2.
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