Abstract
Multiple Resource Theory, and one particular instantiation of the theory in the 4-Dimensional Multiple Resource Model have often been invoked as mechanisms to account for dual task interference. Here we present the data and analyses requirements necessary to conclude that the multiple resource model either does or does not predict an increase in the dual task decrement; and in particular we describe the need to consider and control both task difficulty and task priority in comparing conditions that are argued to contrast shared versus separate resources. We then consider one common misconception regarding what the model predicts regarding perfect time sharing, and address the importance of considering alternative theory-based mechanisms of task switching and of confusion and crosstalk, to account for patterns of multi-task interference.
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