Skip to main content
Advertisement
Browse Subject Areas
?

Click through the PLOS taxonomy to find articles in your field.

For more information about PLOS Subject Areas, click here.

< Back to Article

Do Facial Expressions Develop before Birth?

Figure 1

Illustration of developmental progression in number of action units (AUs) over gestational age.

(a) One AU at 24 weeks (b) Two AUs at 27.5 weeks (c) and (d) two different combinations of 4 AUs at 32 weeks.

Figure 1

doi: https://doi.org/10.1371/journal.pone.0024081.g001