“…The issue of what factors may affect morphological processing has attracted considerable attention, yet existing findings are not consistent to draw a conclusion. Some studies have shown the effects of factors such as formal regularity (Masrai & Milton, 2015;Shi & Chen, 2014), semantic transparency (Marslen-Wilson et al, 1994;Wang & Zhang, 2013;Xu & Taft, 2015;Zhang, 2015Zhang, , 2016, affix productivity (Bertram et al, 1999;Dal Maso & Giraudo, 2014;Lu, 2003;Vannest et al, 2011;Clark, 2014), surface frequency (Dal Maso & Giraudo, 2014;Davies et al, 2016;MacLeod & Kampe, 1996;Masrai & Milton, 2015;Meunier & Segui, 1999), root frequency (Beauvillain, 1996;Yao et al, 2012), stem frequency (Giraudo et al, 2015), and base frequency (Taft, 2004;Xu & Taft, 2015). Productivity refers to the possibility that a word-formation pattern is used to create words.…”