S114 – Thresholds for Visual Perception of Facial Asymmetry

Autor:	Patrick J. Byrne, Tarik Y. Farrag, Eugene Chu, Kofi D. O. Boahene
Rok vydání:	2008
Předmět:	medicine.medical_specialty Visual perception business.industry Conscious perception media_common.quotation_subject Oral commissure Audiology medicine.disease Asymmetry Facial paralysis Otorhinolaryngology Medicine Surgery Mouth angle Normal face business media_common Facial symmetry
Zdroj:	Otolaryngology–Head and Neck Surgery. 139
ISSN:	1097-6817 0194-5998
DOI:	10.1016/j.otohns.2008.05.287
Popis:	ObjectivesTo determine the degree of facial asymmetry which is required to trigger conscious perception in the observer.MethodsA normal face was manipulated typical to facial paralysis changes, using advanced computer program to create progressive images of increasing asymmetry, in one millimeter increments, up to 10 mm. This was performed on 1) brow, 2) oral commissure, and 3) combined brow and oral commissure. The study included both altered and unaltered versions of the model face, in addition to other unaltered images. Images were presented to volunteer observers unaware of the purpose of the study.ResultsI) Oral commissure asymmetry: the threshold for visual perception was 3 mm by the majority of people (73%) when each image was presented for 10 seconds. When up to 4 mm of mouth angle asymmetry was noticed, it was perceived as “noticeable, but acceptable” by 83%, while 6 mm or greater of asymmetry was perceived as “unacceptable” by 60%. Presenting the images for 2 sec/image (quick look) demonstrated ...
Databáze:	OpenAIRE
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