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National Repository of Grey Literature 2 records found  Search took 0.02 seconds. 
Manifestations of facial asymmetry in young adulthood: the relationship between asymmetry of facial expressions and manifestations of brain laterality
 Hřebcová, Eliška ; Velemínská, Jana (advisor) ; Měšťák, Jan (referee)
This thesis focuses on assessing longitudinal changes in facial asymmetry of both neutral expression and various facial expressions in adolescents and young adults aged 15 to 18 years and their relation to handedness. Shape changes were evaluated in 30 girls and 27 boys of which 3 girls and 2 boys were left-handed. For the analysis, 3D geometric morphometry applied to 3D facial scans was used. The scanning itself took place on three different occasions with a 1-year gap between them. A total amount of 1440 facial scans were taken and processed, while 453 of those were used for the analyses. The output of those analyses are colour maps visualizing changes in facial shape. Right-handers were assessed as a mean group, while left-handers were assessed only as individuals, due to their low numbers. The results of longitudinal assessment in right-handers show very similar trends between boys and girls. Protrusion in right side of the forehead and right side of the nose and maxilla was observed, as well as right-sided protrusion of lower lip and mandible in later ages. Left-sided protrusion of angulus mandibulae was observed in both sexes. An almost complete absence of the forementioned forehead protrusion was observed in all left-handers. Protrusion was more often allocated on a left side of the nose....
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Asymmetry of the face and facial expressions in relation to handedness
 Hřebcová, Eliška ; Velemínská, Jana (advisor) ; Kožejová Jaklová, Lenka (referee)
Facial asymmetry is developed in every human and has an impact on everyone's life. Research of facial asymmetry is important not only in plastic surgery, aesthetic medicine and orthodontics, but also in forensic sciences, bioarchaeology and sociocultural anthropology. It can be influenced by various factors including the lateralization of cerebral hemispheres for cognitive and motor functions. According to the literature, handedness in humans is one of the most important forms of laterality which is probably related to facial asymmetry. The observed asymmetries differ not only between left-handers and right-handers, but also between men and women. Emotional expressions are also expressed asymmetrically on the face. Differences between positive and negative emotions as well as spontaneous and voluntarily expressions were observed. Different forms of laterality of motoric and cognitive cerebral functions are related to each other and their impact on facial asymmetry is therefore very complex.
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