Do Facial Expressions Develop before Birth?
Figure 3
Graph showing increasing complexity of facial activity and expressions with gestational age for fetus A.
In all displays, points show the observed proportions and lines show the fitted proportions from the ordinal regressions using linear age: a) Proportion of all Aus b) Proportion of AUs contributing to cry-face gestalt c) Proportion of AUs contributing to cry-face gestalt. In all three displays, the proportion of more complex combinations of AUs is increasing as the fetus ages.