human readers (Raney et al., 2014;Ashby et al., 2005) and to be dependent upon a number of linguistic factors (Van Gompel, 2007).
it has been demonstrated that word frequency, syntactic complexity, and lexical ambiguity play a strong part in determining which sentences are difficult for humans to process (Rayner and Duffy, 1986;Duffy et al., 1988;Levy, 2008).