Left versus right-facing photographs also seem to affect perceptions of the photographic subjects. In a 2010 paper published in the journal Laterality, study participants were more likely to guess that photographic subjects were scientists if the photographs showed their right cheeks, and more likely to place them in the arts and humanities if the photos showed their left cheeks.
Neuroscientists investigating the asymmetry of facial expressions now believe that the left side of the face is controlled by nerves that originate from the right side of the brain, where facial expressions are processed. Right-sided expressions are apparently associated with logic and a lack of emotion.
A 1973 Nature study showed that people tend to present the left side of their face when posing for a portrait, and that the bias is even more pronounced in women than in men.
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