Most people know that the left face and the right face may be different slightly. The fact less well known is the two halves of the face have different roles which are the recognition of someone's identity and the interpretation of the emotional state.
"it's the left side of the face that does most to determine which emotions others see in it ...Around eight out of ten people turned out to base their assessment of the depicted character's mood mainly on the left side" (Smits, 2011, p. 143).
(the middle picture shows their face, with below it a doubled left half on the right and a doubled right half ont he left.)
"people feel an image of the right half of a face filled in with a mirror image of that same half bears a greater resemblance to the person depicted than a composite photo made of two images of the left half " (Smits, 2011, p. 143, 144). "in all circumstances it looks more like itself than the left side, which has greater tendency to change according to the mood of its owner" (Smits, 2011, p. 146).
Smits, R. (2001) The Puzzle of Left-handedness, pp. 143, 144, 146.
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