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How Brow Rotation Affects Emotional Expression Utilizing Artificial Intelligence

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  • Craniofacial/Maxillofacial
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Abstract

Background

It is well known that brow position affects emotional expression. However, there is little literature on how and to what degree this change in emotional expression happens. Previous studies on this topic have utilized manual rating; this method of study remains small and labor intensive. Our objective is to correlate manual brow rotations with emotional outcomes using artificial intelligence to objectively determine how specific brow manipulations affected human expression.

Methods

We included 53 brow-lift patients in this study. Pre-operative patients’ brows were rotated to − 20, − 10, +10, and +20 degrees in respect to the central axis of their existing brow using PIXLR, a cloud-based set of image editing tools and utilities. These images were analyzed using FaceReader, a validated software package that uses computer vision technology for facial expression recognition. The primary facial emotion and intensity of facial action units (0 = no action unit detected to 4 = most intense action unit detected) generated by the software were recorded.

Results

265 total images [5 images (pre-operative, − 20 degree brow rotation, − 10, +10, and +20) per patient] were analyzed using FaceReader. The primary emotion detected in the majority of images was neutral. The percentage of disgust in patients’ expressions, as detected by FaceReader, increased with increased positive brow rotation (1.76% disgust detected at − 20 degrees, 2.09% at − 10 degrees, 2.65% at neutral, 2.61% at +10 degrees, and 2.95% at +20 degrees). In contrast, the percentage of sadness in patients’ expressions decreased with increased positive brow rotation (29.92% sadness detected at − 20 degrees, 21.5% at − 10 degrees, 11.42% at neutral, 15.75% at +10 degrees, and 12.86% at +20 degrees).

Our facial action unit analysis corresponded with primary emotion analysis. The intensity of the inner brow raiser decreased with increased positive brow rotation 8.54% at − 20 degrees, 4.21% at − 10 degrees, 1.48% at neutral, 0.84% at +10 degrees, and 0.76% at +20 degrees). The intensity of the outer brow raiser increased with increased positive brow rotation (0.97% at − 20 degrees, 0.45% at − 10 degrees, 1.12% at neutral, 5.45% at +10 degrees, and 11.19% at +20 degrees).

Conclusion

We demonstrated that increasing the degree of brow rotation correlated positively with the percentage of disgust and inversely with the percentage of sadness detected by FaceReader. This study demonstrated how different manipulated brow positions affected emotional outcomes using artificial intelligence. Physicians can use these findings to better understand how brow-lifts can affect the perceived emotion of their patients.

Level of Evidence III

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Correspondence to Agnes Zhu.

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Zhu, A., Boonipat, T., Cherukuri, S. et al. How Brow Rotation Affects Emotional Expression Utilizing Artificial Intelligence. Aesth Plast Surg 47, 2552–2560 (2023). https://doi.org/10.1007/s00266-023-03615-5

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  • DOI: https://doi.org/10.1007/s00266-023-03615-5

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