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Referee report. For: Robustness of the aging effect of smiling against vertical facial orientation [version 3; peer review: 2 approved]
Previous studies have shown that the association between smiling and youth is a misconception; smiling faces have been estimated to be older than neutral faces. Previous studies have indicated that this aging effect of smiling (AES) is due to eye wrinkles caused by the facial action of smiling. However, whether holistic processing for facial expressions is involved in AES has not been investigated. The present study aimed to clarify these issues. Methods: Participants were recruited todoi:10.5256/f1000research.135719.r143194 fatcat:o5plhpblfjaapj7mvjfrpsikoa