Multi-tasking costs in triple-task performance despite dual-task preparation.

This study explores multi-tasking by examining the effects of transitioning from dual-task to triple-task scenarios. Our research extends beyond conventional dual-task paradigms to investigate the impact of triple-task performance on two participant groups: those unprepared in single, dual, or triple tasks (N = 14) and those previously prepared in single and dual tasks (N = 13). The study consisted of a preparation phase with nine sessions and an assessment phase with eight sessions. In the assessment phase, both groups performed single, dual, and triple tasks of varying complexity (simple, medium, and complex). Despite the initial advantage observed in the prepared group, this advantage diminished throughout the sessions. Notably, both groups adopted distinct strategies for processing within the triple task, revealing the influence of task coordination on response times as the task set combinations expanded. The study demonstrates that preparation in the form of pre-training can facilitate applying skills acquired from specific tasks to others, with the formation of specific task pair sets playing a pivotal role in processing and coordination. Despite extensive preparation, the persistence of multi-tasking costs challenges traditional assumptions about eliminating such costs through practice. In conclusion, our research contributes to the current understanding of multi-tasking by highlighting the need for further exploration into inter(sub)task coordination and prioritization in multiple-task scenarios. The study underscores the complexities inherent in managing triple tasks and individuals' potential strategies. The findings suggest that ongoing refinement of cognitive models from dual tasks is necessary to accommodate multi-tasking behaviors in more complex environments.