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Sensitivity of a method for the analysis of facial mobility. I. Vector of displacement.

Abstract：

OBJECTIVE:(1) To determine which facial landmarks show the greatest movement during specific facial animations and (2) to determine the sensitivity of our instrument in using these landmarks to detect putatively abnormal facial movements. DESIGN:Movements of an array of skin-based landmarks on five healthy human subjects (2 men and 3 women; mean age, 27.6 years; range, 26 to 29 years) were observed during the execution of specific facial animations. To investigate the instrument sensitivity, we analyzed facial movements during maximal smile animations in six patients with different types of functional problems. In parallel, a panel was asked to view video recordings of the patients and to rate the degree of motor impairment. Comparisons were made between the panel scores and those of the measurement instrument. RESULTS:Specific regions of the face display movement that is representative of specific animations. During the smile animation, landmarks on the mid- and lower facial regions demonstrated the greatest movement. A similar pattern of movement was seen during the cheek puff animation, except that the infraorbital and chin regions demonstrated minimal movement. For the grimace and eye closure animations, the upper, mid-facial, and upper-lip regions exhibited the greatest movement. During eye opening, the upper and mid-facial regions, excluding the upper lip and cheek, moved the most, and during lip purse, markers on the mid- and lower face demonstrated the most movement. We used the smile-sensitive landmarks to evaluate individuals with functional impairment and found good agreement between instrument rankings based on the data from these landmarks and the panel rankings. CONCLUSION:The present method of three-dimensional tracking has the potential to detect and characterize a range of clinically significant functional deficits.

journal_name

Cleft Palate Craniofac J

journal_title

The Cleft palate-craniofacial journal : official publication of the American Cleft Palate-Craniofacial Association

authors

Trotman CA,Faraway JJ,Silvester KT,Greenlee GM,Johnston LE Jr

doi

10.1597/1545-1569_1998_035_0132_soamft_2.3.co_2

subject

Has Abstract

pub_date

1998-03-01 00:00:00

pages

132-41

issue

eissn

1055-6656

issn

1545-1569

journal_volume

pub_type

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Sensitivity of a method for the analysis of facial mobility. I. Vector of displacement.