Pictures of the left side of the face are perceived and rated as more pleasant than pictures of the right side of the face, leading scientists from Wake Forest University to hypothesize that we prefer the left side’s more intense expressions of emotionality.
Past research indicated that the left side of the face is more intense and active during emotional expression, so Wake’s Kelsey Blackburn and James Schirillo set out to investigate whether observers have a preference for the left or right side of the face in real-life photographs of individuals.
For the study, participants were asked to rate the pleasantness of both sides of male and female faces on gray-scale photographs. The researchers presented both original photographs and mirror-reversed images, so that an original right-cheek image appeared to be a left-cheek image and vice versa.
Blackburn and Schirillo found a strong preference for left-sided portraits, regardless of whether the pictures were originally taken of the left side, or mirror-reversed. Gender-wise, the left side of the face was rated as more aesthetically pleasing for both male and female posers. Importantly, these aesthetic preferences were also confirmed by measurements of pupil size, a reliable unconscious measurement of interest (pupils dilate in response to more interesting stimuli).
The findings, appearing in the journal Experimental Brain Research, may also help explain why the majority of artists’ portraits present the subjects’ left profile.
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