Focal Length Affects Depicted Shape and Perception of Facial Images

PloS One
Vít TřebickýJan Havlíček

Abstract

Static photographs are currently the most often employed stimuli in research on social perception. The method of photograph acquisition might affect the depicted subject's facial appearance and thus also the impression of such stimuli. An important factor influencing the resulting photograph is focal length, as different focal lengths produce various levels of image distortion. Here we tested whether different focal lengths (50, 85, 105 mm) affect depicted shape and perception of female and male faces. We collected three portrait photographs of 45 (22 females, 23 males) participants under standardized conditions and camera setting varying only in the focal length. Subsequently, the three photographs from each individual were shown on screen in a randomized order using a 3-alternative forced-choice paradigm. The images were judged for attractiveness, dominance, and femininity/masculinity by 369 raters (193 females, 176 males). Facial width-to-height ratio (fWHR) was measured from each photograph and overall facial shape was analysed employing geometric morphometric methods (GMM). Our results showed that photographs taken with 50 mm focal length were rated as significantly less feminine/masculine, attractive, and dominant compare...Continue Reading

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Citations

Dec 18, 2016·Behavioural Processes·Jaroslava Varella ValentovaKarel Kleisner
Apr 28, 2018·Perception·Susan HayesGordon Wallace
Dec 2, 2017·Ophthalmic Plastic and Reconstructive Surgery·Philipe BerrosRonald Mancini
Oct 18, 2018·American Journal of Human Biology : the Official Journal of the Human Biology Council·Dariusz P DanelKarel Kleisner
Jun 30, 2018·JAMA Facial Plastic Surgery·Emily A Cooper, Martin S Banks
Jan 31, 2019·Frontiers in Psychology·Vít TřebickýJan Havlíček
May 24, 2017·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Hannah M Rowland, Robert P Burriss
Nov 13, 2020·Facial Plastic Surgery & Aesthetic Medicine·Shauna M RiceArianne Shadi Kourosh
May 4, 2021·International Journal of Women's Dermatology·Shauna M RiceArianne Shadi Kourosh

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Software Mentioned

Generalized Procrustes Analysis ( GPA )
Sylights
Qualtrics survey
GIMP
tpsDig2
Vegan package
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tpsRelw

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