The Influence of Image Exposure Duration on Facial Perception-Why It Matters.

BACKGROUND

First impressions from faces, thought to serve an adaptive evolutionary role, vary by age and gender. Understanding gaze patterns is key to uncovering how these impressions form. Understanding facial gaze during brief (1 s) and longer (8 s) exposures helps identify key facial areas and behaviors, providing insights for better aesthetic assessment for non-invasive and surgical procedures to enhance outcomes and satisfaction.

AIMS: To evaluate whether we perceive faces differently depending on the gaze duration.

METHODS

The number of stable eye fixations (total fixation count) of n = 55 observers (34 females, 21 males) in seven facial regions of four visual stimulus images (young and old male and female) was analyzed using eye-tracking technology. The four visual stimulus images were presented to the observers twice in a randomized order with exposure times of 1 and 8 s.

RESULTS

Regardless of age or sex of the face, fixation rankings followed similar patterns, with slight shifts between 1 and 8-s exposures. Age- and sex-specific analyses revealed gaze pattern differences.

CONCLUSION

A consistent facial scanning pattern, starting with central features (periorbital, nose, perioral) and expanding to cheeks, forehead, chin, and jawline, was observed regardless of the inspection time. However, longer image exposure shifts focus to regions more crucial for facial expressions, such as the perioral and forehead areas. This effect is especially visible for mature faces in which increased exposure time makes observer focus on the areas where age-related changes are most visible (i.e., perioral) and, on the other hand, possible to be corrected with injections.