Daeglau Mareike, Zich Catharina, Emkes Reiner, Welzel Julius, Debener Stefan, Kranczioch Cornelia
Neuropsychology Laboratory, Department of Psychology, School of Medicine and Health Sciences, Carl von Ossietzky University of Oldenburg, Oldenburg, Germany.
Neurocognition and Functional Neurorehabilitation Group, Department of Psychology, School of Medicine and Health Sciences, Carl von Ossietzky University of Oldenburg, Oldenburg, Germany.
Front Psychol. 2020 Feb 5;11:57. doi: 10.3389/fpsyg.2020.00057. eCollection 2020.
For motor imagery (MI) to be effective, an internal representation of the to-be-imagined movement may be required. A representation can be achieved through prior motor execution (ME), but the neural correlates of MI that are primed by ME practice are currently unknown. In this study, young healthy adults performed MI practice of a unimanual visuo-motor task (Group , = 19) or ME practice combined with subsequent MI practice (Group , = 18) while electroencephalography (EEG) was recorded. Data analysis focused on the MI-induced event-related desynchronization (ERD). Specifically, changes in the ERD and movement times (MT) between a short familiarization block of ME (Block pre-ME), conducted before the MI or the ME combined with MI practice phase, and a short block of ME conducted after the practice phase (Block post-ME) were analyzed. Neither priming effects of ME practice on MI-induced ERD were found nor performance-enhancing effects of MI practice in general. We found enhancements of the ERD and MT in Block post-ME compared to Block pre-ME, but only for Group . A comparison of ME performance measures before and after the MI phase indicated however that these changes could not be attributed to the combination of ME and MI practice. The mixed results of this study may be a consequence of the considerable intra- and inter-individual differences in the ERD, introduced by specifics of the experimental setup, in particular the individual and variable task duration, and suggest that task and experimental setup can affect the interplay of ME and MI.
为使运动想象（MI）有效，可能需要对即将想象的运动进行内部表征。可以通过先前的运动执行（ME）来实现表征，但目前尚不清楚由ME练习引发的MI的神经关联。在本研究中，年轻健康成年人在记录脑电图（EEG）的同时，进行了单手视觉运动任务的MI练习（组 ， = 19）或ME练习并随后进行MI练习（组 ， = 18）。数据分析集中在MI诱发的事件相关去同步化（ERD）上。具体而言，分析了在MI或ME与MI练习阶段之前进行的ME的短暂熟悉块（ME前块）与练习阶段之后进行的ME的短暂块（ME后块）之间ERD和运动时间（MT）的变化。既未发现ME练习对MI诱发的ERD有启动效应，也未发现MI练习总体上有提高表现的效应。我们发现与ME前块相比，ME后块中的ERD和MT有所增强，但仅适用于组 。然而，对MI阶段前后ME表现指标的比较表明，这些变化不能归因于ME和MI练习的结合。本研究的混合结果可能是由实验设置的特殊性（特别是个体和可变的任务持续时间）引入的ERD中个体内和个体间的显著差异导致的，这表明任务和实验设置会影响ME和MI的相互作用。
