Pronouncing nouns or verbs while grasping distinctly alters movement. Changes in hand speed and final position occur according to the meaning of the words spoken. These results are typically found when executing a single movement paired with a single word. For example, pronouncing the word 'fast' increased the speed of the hand when reaching to grasp. Our objective was to compare how verb and noun fluency tasks interact with grasping behaviour in a grasp-to-construct task. Because previous imaging research shows that verb and noun production activates distinct neural areas, we reasoned that grasping outcomes would differ according to the category of word produced by participants. Specifically, we hypothesized that verb pronunciation would distinctly affect grasping behaviour compared to producing nouns. We recruited 38 young adults who performed a grasp-to-construct task and two different verbal fluency tasks. Participants completed each task (grasp, verb fluency, and noun fluency) separately as control conditions, and the grasping and each speaking task simultaneously for dual-task conditions. We found that during the dual-task condition, when generating nouns and grasping, participants made significantly more grasping errors (inaccurate grasps) compared to the control and verb dual-task conditions. Moreover, our results revealed a relationship between the number of verbs generated and grasping performance. Participants who generated more verbs were faster and more accurate during the motor component of the dual-task condition. This relationship was not observed when nouns were produced, indicating a unique relationship between verb production and functional grasping. The result is a facilitation effect, diminishing the negative outcome on motor control associated with increased cognitive load (as observed during noun pronunciation).

中文翻译：

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语音和运动技能的双重任务表现：动词生成有助于掌握行为。

抓住时发音的名词或动词会明显改变动作。手速度和最终位置的变化根据所讲单词的含义而发生。这些结果通常在执行与单个单词配对的单个移动时找到。例如，读“快”一词会加快手的抓握速度。我们的目的是比较动词和名词的流利度任务如何与抓握到构造任务中的抓握行为相互作用。由于先前的影像学研究表明动词和名词产生会激活不同的神经区域，因此我们认为，根据参与者产生的单词类别，掌握结果的方式会有所不同。具体来说，我们假设动词发音与产生名词相比会明显影响抓地行为。我们招募了38位年轻人，他们执行了从构图到学习的任务以及两项不同的口语流利任务。参加者分别完成每个任务（抓握，动词流利性和名词流利性）作为控制条件，同时完成双任务条件的抓握和每个口语任务。我们发现，在双重任务条件下，与控制和动词双重任务条件相比，参与者在产生名词和抓握时会产生更多的抓握错误（不准确的抓握）。而且，我们的结果揭示了所产生的动词数量与抓地表现之间的关系。在双任务条件的运动过程中，产生更多动词的参与者更快，更准确。产生名词时没有观察到这种关系，表明动词产生和功能性掌握之间的独特关系。结果是促进作用，减少了与认知负荷增加相关的运动控制的负面结果（如名词发音中所观察到的）。