Interest (emotion)

Interest is a feeling or emotion that causes attention to focus on an object, event, or process.

In contemporary psychology of interest,[1] the term is used as a general concept that may encompass other more specific psychological terms, such as curiosity and to a much lesser degree surprise.

[citation needed] The emotion of interest does have its own facial expression, of which the most prominent component is having dilated pupils.

Each letter has its own (background) circle that is micro-oscillating in brightness in different time transitions[clarification needed], where the determination of letter selection is based on the best fit between first, unintentional pupil-size oscillation pattern and second, the circle-in-background's brightness oscillation pattern[clarification needed].

Accuracy is additionally improved by the user's mental rehearsing of the words 'bright' and 'dark' in synchrony with the brightness transitions of the circle/letter.