Abstract
Background:
A more refined and clinically related facial expression analysis is required for patients who wish to be perceived more emotionally positive.
Objective:
To measure the change in skin vector and volume in facial subunits when expressing positive expression (happiness) compared with negative expressions (sadness, fear, disgust, and anger), using three-dimensional (3D) stereophotogrammetry analysis.
Methods:
This study took 3D photographs of 20 volunteers' face at rest and during positive and negative expression. The directions of skin vector and volume changes in each facial subregion were recorded and calculated.
Results:
In the positive expression, 78.3% (95% confidence interval [CI] 66.8–89.9) of the medial midfacial subregions presented superolateral vector and volume increase, whereas volume decrease in 82.5% (95% CI 78.5–86.5) of the lip subregions could be observed. In the negative expression, the vector changes were predominantly inferomedial in 26.0% (95% CI 15.4–36.5) of the forehead and 36.8% (95% CI 33.2–40.3) of the upper eyelid subregions, whereas volume increases in 34.0% (95% CI 30.4–37.7) of the upper eyelid subregions were observed.
Conclusions:
This 3D stereophotogrammetry analysis presents the morphological difference between the positive and negative expression.
Get full access to this article
View all access options for this article.
References
Supplementary Material
Please find the following supplemental material available below.
For Open Access articles published under a Creative Commons License, all supplemental material carries the same license as the article it is associated with.
For non-Open Access articles published, all supplemental material carries a non-exclusive license, and permission requests for re-use of supplemental material or any part of supplemental material shall be sent directly to the copyright owner as specified in the copyright notice associated with the article.
