ABSTRACT Although speakers can go on producing utterances while doing concurrent tasks, language planning is affected in conditions of divided attention. It is however unclear whether a concurrent task impacts only lexical selection, or if post-lexical processing is also impacted. To elucidate this question, we reasoned that if an encoding process is under attentional control, this should be even more the case when the planning process is disrupted due to brain damage: increased error rates in left-hemisphere damaged participants under dual-task conditions should therefore shed light on which encoding processes need attentional resources. Twelve participants producing either predominantly lexical or phonological errors following left-hemisphere stroke and eleven matched healthy controls underwent a dual-task picture naming paradigm with a concurrent auditory verbal and non-verbal task. The results indicate an impact of active dual-tasks on word production in both controls and aphasic participants, but a magnified effect on errors in aphasic participants with an overall increase of phonological errors under dual-task conditions. These results suggest that post-lexical encoding processes are under attentional demand.

中文翻译：

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词形编码受到关注：失语症双任务干扰的证据

摘要 虽然说话者可以在执行并发任务的同时继续发出话语，但在注意力分散的情况下，语言规划会受到影响。然而，尚不清楚并发任务是否仅影响词汇选择，或者词后处理是否也受到影响。为了阐明这个问题，我们推断，如果编码过程处于注意力控制之下，那么当计划过程因脑损伤而中断时，情况更应如此：双任务条件下左半球受损参与者的错误率应增加因此阐明了哪些编码过程需要注意资源。12 名参与者在左半球中风后主要产生词汇或语音错误，11 名匹配的健康对照接受双任务图片命名范式，同时进行听觉语言和非语言任务。结果表明，主动双任务对对照组和失语症参与者的单词产生都有影响，但对失语症参与者的错误影响更大，双任务条件下语音错误总体增加。这些结果表明后词汇编码过程需要注意。但在双任务条件下，语音错误总体上增加了对失语症参与者错误的放大影响。这些结果表明后词汇编码过程需要注意。但在双任务条件下，语音错误总体上增加了对失语症参与者错误的放大影响。这些结果表明后词汇编码过程需要注意。