De Jong R
University of Groningen, The Netherlands.
Q J Exp Psychol A. 1995 Feb;48(1):2-25. doi: 10.1080/14640749508401372.
We examined how performance of two overlapping discrete tasks is organized and controlled. Experiment 1 showed that when stimuli were presented in an unexpected order, expectations rather than actual presentation order determined the order in which the two stimuli were processed. In Experiment 2, when task order was unpredictable, performance was facilitated when task order was repeated on consecutive trials. In Experiment 3, performance of the second but not the first task benefited greatly when task order was held constant as compared to regularly alternated between trials; such effects were especially pronounced at short intertrial intervals. These results suggest that sequential performance of overlapping tasks is scheduled in advance and is regulated by initially allocating the central processing channel to one task and subsequently switching this channel to the other task.
我们研究了两个重叠的离散任务的执行是如何组织和控制的。实验1表明，当刺激以意外顺序呈现时，期望而非实际呈现顺序决定了处理这两个刺激的顺序。在实验2中，当任务顺序不可预测时，连续试验中重复任务顺序会促进表现。在实验3中，与试验间定期交替相比，当任务顺序保持恒定时，第二个任务而非第一个任务的表现受益极大；这种效应在短试验间隔时尤其明显。这些结果表明，重叠任务的顺序执行是预先安排的，并且通过最初将中央处理通道分配给一个任务，随后将该通道切换到另一个任务来进行调节。
