Description: The face can communicate varied personal information
including subjective emotion, communicative intent, and
cognitive appraisal. Accurate interpretation by observer or
computer interface depends on attention to dynamic properties
of the expression, context, and knowledge of what
is normative for a given individual. In two separate studies,
we investigated individual differences in the base rate
of positive facial expression and in specific facial action
units over intervals from 4- to 12 months. Facial expression
was measured using convergent measures, including facial
EMG, automatic feature-point tracking, and manual FACS
coding.
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