Reaction time in double stimulation tasks was investigated, and a simultaneous regression model was proposed within the concept of variable capacity allocation theory. The model was tested using a double stimulation task paradigm. In the experiment, six levels of inter-stimulus interval (ISI) and three levels of stimulus complexity were employed. The regression analysis showed that the effects of stimulus complexity and ISI were significant. From the simultaneous regression model, reaction times to the first and to the second stimulus were predicted for the different experimental conditions.
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