Abstract

Human multitasking suffers from a central attentional bottleneck preventing parallel performance of central mental operations, leading to profound deferments in task performance. While previous research assumed that the deferment is caused by a mere waiting time, we show that the bottleneck requires executive functions accounting for a profound part of the deferment. Three participant groups with EF impairments showed worse multitasking performance than respective control groups. Three further groups with EF improvements showed improved multitasking. Finally, three groups performed a dual-task and different measures of EF and showed significant correlations between multitasking performance and working memory capacity. Demands on EF during multitasking may cause more errors, mental fatigue and stress, with parts of the population being considerably more prone to this.