Miller Jeff, Ulrich Rolf
Department of Psychology, University of Otago, Dunedin, New Zealand.
Q J Exp Psychol (Hove). 2008 Jul;61(7):999-1019. doi: 10.1080/17470210701434540.
In three experiments we measured response time (RT) and peak force (PF) to investigate the grouping of left- and right-hand key press responses in a dual-task paradigm involving two independent go/no-go tasks. Within each task, a go stimulus within one of two modalities (i.e., visual versus auditory) required a response by one hand. In Experiment 1 with simultaneous go stimuli in the two tasks, responses appeared to be grouped in approximately 75-80% of trials, compared with nearly 100% grouping in a single-task condition requiring bimanual responses to the onset of any stimulus in either modality. In Experiment 2 with stimulus onset asynchronies (SOAs) of 0-400 ms between the two go stimuli, response grouping clearly declined as SOA increased, although some grouping was still evident even at the longest SOA. The same pattern was observed in Experiment 3 with the same range of SOAs but unpredictable stimulus order, suggesting that grouping is not strongly dependent on prior knowledge of the likely response order. These results emphasize the pervasiveness of response grouping in bimanual dual-task RT paradigms and provide useful clues as to its nature.
在三项实验中，我们测量了反应时间（RT）和峰值力（PF），以研究在涉及两个独立的“是/否”任务的双任务范式中，左右手按键反应的分组情况。在每个任务中，两种模态（即视觉与听觉）之一中的一个“是”刺激要求一只手做出反应。在实验1中，两个任务同时出现“是”刺激，在大约75% - 80%的试验中，反应似乎是分组的，而在单任务条件下，要求对任一模态中任何刺激的出现进行双手反应时，分组率接近100%。在实验2中，两个“是”刺激之间的刺激起始异步（SOA）为0 - 400毫秒，随着SOA的增加，反应分组明显下降，尽管即使在最长的SOA时仍有一些分组明显可见。在实验3中，SOA范围相同但刺激顺序不可预测，也观察到了相同的模式，这表明分组并不强烈依赖于对可能的反应顺序的先验知识。这些结果强调了在双手双任务RT范式中反应分组的普遍性，并为其性质提供了有用的线索。
