In two experiments (N= 60 each), we investigated the locus of backward crosstalk effects in dual tasking. Specifically, we embedded the typical flanker task within a dual-task paradigm by assigning stimulus-response (S-R) rules to the flankers. In Experiment 1, participants were instructed to first respond to the center letter and only respond to the flanker if the center was a no-go stimulus (i.e., prioritized processing paradigm). Mapping condition was varied between-subjects to be either matched (i.e., same S-R rule for flankers as for center letters), reversed (i.e., opposite S-R rule for flankers), or neutral (i.e., different letters for flankers with separate S-R rules). The results indicated that the backward crosstalk effect was mainly driven by a stimulus-based compatibility, as indicated by a significant S₂−R₁ compatibility effect in the matched and reversed conditions, with little change in this effect between the matched and reversed conditions. Experiment 2 replicated and extended these findings to a psychological refractory period paradigm. The present findings suggest that in the matched and reversed conditions, there was only one S-R rule active at a time.

在两个实验（Ñ= 60个），我们研究了双重任务中反向串扰影响的原因。具体来说，我们通过将刺激响应（SR）规则分配给侧翼，将典型的侧翼任务嵌入到双任务范式中。在实验1中，指示参与者首先响应中心字母，并且仅在中心是不参与刺激的情况下（即优先处理范式）才响应侧翼。映射条件因对象而异，可以匹配（即，针对侧翼的SR规则与中心字母相同），颠倒（即针对侧翼的SR规则）或中立（即针对具有单独SR规则的侧翼的不同字母） 。结果表明，反向串扰效应主要由基于刺激的相容性驱动，如明显的S ₂ -R所示。在匹配和反向条件下的兼容性效果为₁，而在匹配和反向条件下此效果几乎没有变化。实验2将这些发现复制并扩展到心理不应期范式。目前的发现表明，在匹配和逆转的条件下，一次只有一个SR规则处于活动状态。