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. Author manuscript; available in PMC: 2016 Jun 1.
Published in final edited form as: Behav Res Methods. 2015 Jun;47(2):562–570. doi: 10.3758/s13428-014-0491-x

Figure 1.

Figure 1

Facial expressions: A: neutral, B: fear, C: puffed cheeks, D: impossible dislocation of eyes and mouth. Note that, though the final pose appears to be an unusual but possible face configuration, the movements themselves are clearly impossible to viewers.