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. 2019 Jul 5;14(7):e0209530. doi: 10.1371/journal.pone.0209530

Fig 1. An example stimulus used for the composite face test.

Fig 1

KDEF face AM031: From left to right: unaltered; eyes narrower; mouth higher and eyes narrower; and mouth higher. The differences in spacing are subtle but involve the movement of features by 1 SD of natural variability of those features in the population of faces and are well within the ability to detect such changes [63].