The importance of facial appearance is rooted in evolution and studies suggest that judging a person based on his or her appearance boils down to survival.
"Our animal instinct tells us to avoid those who are ill-willed and we know from previous research that personality traits are drawn from an individual's neutral expressions," said Michael J Reilly, an assistant professor at Georgetown University School of Medicine.
Reilly and his colleagues set out to evaluate and quantify the changes in personality perception that occur after various types of facial rejuvenation surgery, including face lift, upper and lower eye lifts, brow lift, neck lift and/or chin implant.
Respondents were asked to rate their perception of attractiveness and femininity, and personality traits (extroversion, likeability, social skills, risk-seeking behaviour, aggressiveness and trustworthiness) of each picture they reviewed.
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No reviewer saw both the before and after photos of the same woman, and no one knew whether plastic surgery had been performed.
Post-surgery improvement was detected for four traits: social skills, likeability, attractiveness and femininity. While not statistically significant, a trend towards trustworthiness also was seen.
"Having a face lift and lower eye lift were the two procedures that appeared to garner more favourable reviews after surgery, with the lower eye lift carrying a little more weight," Reilly said.
"This may explain why the patients who had a lower eye lift were found to be significantly more attractive and feminine, and experienced improved trustworthiness scores," Reilly said.
Attempts were made to determine if there was an identifiable factor that may have yielded less favourable responses, but no single variable appears to be statistically significant, Reilly said.
However, some patients were rated for increased aggressiveness and risk-taking after surgery.
"Some might say that is negative, but others may want that look," he said.
The study was published in the journal JAMA Facial Plastic Surgery.