Lexical complexity of academic presentations

The present study examined the lexical complexity profiles of academic presentations of three groups of university students (N = 93) – native English speaking, English as a second language, and English as a lingua franca users. It adopted a notion of lexical complexity which includes lexical diversity, lexical density, and lexical sophistication as main dimensions of the framework. The study aimed at finding out how the three academically similar groups of presenters compared on their lexical complexity choices, what the lexical complexity profiles of high quality students’ academic presentations looked like, and whether we can identify variables that contribute to the overall lexical complexity of presentations given by each group in a unique way. The findings revealed overwhelming similarities across the three groups of presenters and also suggested that the three dimensional framework provides a holistic picture of the lexical complexity for various groups of English for academic purposes presenters.