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Blind source separation, surface EMG, motor unit, EMG decomposition, performance validation In fact, most surface EMG decomposition algorithms based on blind source separation (BSS) use a parallel search strategy, i.e., they repeatedly search for a number of motor units from the original signal and then deal with duplicates at the end. Keywords: surface EMG; motor unit; EMG decomposition; blind source separation; performance validation EN surface EMG motor unit EMG decomposition blind source separation performance validation 1 4 4 05/30/22 20220526 NES 220526 Introduction Significant progress has been achieved in decomposition of surface electromyographic (EMG) signals, particularly with advances in surface electrode array recording and processing techniques (Holobar and Zazula, [6]; Chen and Zhou, [3]; Negro et al., [11], among others). The agreement in discharge timing of the common motor units from both types of recordings can be viewed as a performance index of the surface EMG decomposition, given that intramuscular EMG decomposition has been well established (Parsaei et al., [12]). [Extracted from the article]