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. 2011 Aug 31;6(8):e24081. doi: 10.1371/journal.pone.0024081

Figure 2. Illustration of neutral faces over gestational age and combinations of action units (AUs) for the laughter and cry gestalts.

Figure 2

(a) neutral face at 28 weeks and (b) at 33 weeks. (c) 4 AUs contributing to the laughter gestalt at 32.5 weeks and d) 5 AUs contributing to the cry gestalt at 33 weeks.