Here is a demo video showing a participant reading a formatted document. His gaze fixations are mapped to documents token such as letters, word and sentences. Next, every target word then is attributed with a corresponding emotional and EEG state:
https://www.youtube.com/watch?v=MSW4XswI0L4&list=PLBHeQ2hlgxlUJ6T4gKhIK_13mH8AN2-Rq