Sangals Jörg, Wilwer Maria, Sommer Werner
Humboldt-University at Berlin, Berlin, Germany.
Q J Exp Psychol (Hove). 2007 Jun;60(6):860-76. doi: 10.1080/17470210600822720.
Practice effects on dual-task processing are of interest in current research because they may reveal the scope and limits of parallel task processing. Here we used onsets of the lateralized readiness potential (LRP), a time marker for the termination of response selection, to assess processing changes after five consecutive dual-task sessions with three stimulus onset asynchronies (SOAs) and priority on Task 1. Practice reduced reaction times in both tasks and the interference between tasks. As indicated by the LRP, the reduction of dual-task costs can be explained most parsimoniously by a shortening of the temporal demands of central bottleneck stages, without assuming parallel processing. However, the LRP also revealed a hitherto unreported early activation over the parietal scalp after practice in the short SOA condition, possibly indicating the isolation of stimulus-response translation from other central processing stages. In addition, further evidence was obtained from the LRP for a late motoric bottleneck, which is robust against practice.
练习对双任务处理的影响是当前研究的热点，因为它们可能揭示并行任务处理的范围和局限性。在此，我们使用了侧化准备电位（LRP）的起始点，这是反应选择终止的一个时间标记，来评估在连续五个双任务会话后处理过程的变化，其中包括三种刺激起始异步（SOA）情况以及任务1的优先级。练习减少了两项任务的反应时间以及任务之间的干扰。正如LRP所表明的，双任务成本的降低可以最简洁地解释为中央瓶颈阶段时间需求的缩短，而无需假设并行处理。然而，LRP还揭示了在短SOA条件下练习后顶叶头皮上一种迄今未报道的早期激活，这可能表明刺激-反应转换与其他中央处理阶段的分离。此外，从LRP还获得了进一步的证据，证明存在一个后期运动瓶颈，它对练习具有较强的抗性。
