In a dual-task procedure, Logie had participants do mental addition or an imaging task as one task and a letter span or visual span task as the other task. The results:

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Logie's results were consistent with domain-specific resource accounts because they showed that performance on two tasks suffered when both tasks required similar cognitive resources (e.g., visual or verbal), supporting the idea that there are separate pools of cognitive resources for different types of tasks.

In a Dual-Task Procedure, Logie Had Participants Do Mental Addition