Differences in facial expressions

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It is not clear if the mimic muscles undergo the same process of maturation with changes in facial expression, or whether these expressions remain constant throughout growth. The vertical distance between Ulip—Llip increased in all groups during the lip pucker. The adult subjects were students in the final 2 years of their dental studies at the University of Geneva and in the postgraduate programmes. A paired t -test was used to estimate the differences in the measurements from these two video recordings and to evaluate the systematic error. However, for the same distance, when choosing the lip pucker, this distance diminished, thus giving a negative percentage change. Each videocassette was then transferred to a computer, digitized, and the video sequence was entered into the program, Adobe Premiere 6. The results showed excellent reliability Tables 1 and 2.

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A video was used to record each individual executing three facial expressions:

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Gender and age differences in facial expressions.

For the lip pucker, males showed a larger percentage change from rest to pucker than females. Males had a greater upward vertical movement capacity in the studied facial expressions than females which is in agreement with the findings of Paletz et al. Facial expressions reflect the function of the underlying neuromuscular structure of the face Ekman and Friesen, Statistical analysis with a two-way multivariate analysis of variance MANOVA was performed, with gender and age as the independent variables. Otto found that females smile more expansively and more often than males. Age and the interaction of age and gender seemed to have an effect on this movement. Initially, the individual at rest with their teeth in occlusion and with their lips relaxed and closed was recorded.

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