It is currently estimated that over 1.5 billion people are learning English as a Second Language (ESL) worldwide.
it has been shown that key aspects of the reader's characteristics and cognitive state, such as mind wandering during reading (Reichle et al., 2010), dyslexia (Rello and Ballesteros, 2015) and native language (Berzak et al., 2017) can be inferred from their gaze record.