Eye movement patterns are consistent when viewing relevant content in a specific domain, while smiles and electrodermal activity can implicitly indicate progress and completion of search tasks. Nonverbal behaviors like eye movements, smiling, and electrodermal responses provide clues about cognitive and emotional states during information seeking and problem solving.

4. Affective, cognitive and psychological perspectives

6. • One’s eye movement pattern is consistent when seeing
relevant content in a certain domain

7. Smiles and EDA can be implicit indicators of progress and completion of
search tasks