Fig. 2

Data processing workflow. Schematic description of the data processing and analysis procedures. a Experimental data: Scene frames and eye-tracking raw data were linked by timestamps. b Data processing: Scene frames were transformed into two saliency maps by salience estimation algorithms (physical salience, motion salience) and the areas of interest (eyes, mouth, face, body) which were manually defined. Eye-tracking raw data were preprocessed according to recent recommendations [69], and gaze information was estimated by Grafix Software [68]. c Statistical analysis: Individual gaze information was matched to both saliency maps and areas of interest and related in the linear mixed models to pupillary reactivity as a proxy of LC-NE phasic activity