New Study Reveals Acoustic Basis for 'Aegyo' Trend

A new study has shed light on the acoustic mechanisms behind 'aegyo,' a Korean trend involving adults adopting baby-like voices and exaggeratedly cute mannerisms. Researchers from Duksung Women's University in South Korea and the University of Zurich in Switzerland analyzed the vocal patterns of individuals speaking with and without aegyo, revealing that the trend relies on altering vocal tract acoustics to mimic those of children.

The findings indicate that speakers employing aegyo modify their voices to produce higher formant frequencies, a characteristic associated with shorter vocal tracts, similar to those found in children. "Speakers of aegyo make themselves sound smaller and younger," explained Volker Dellwo, an author of the study. This technique involves raising pitch and altering vowel sounds.

Aegyo, which translates to 'acting cute,' often involves high-pitched vocalizations, exaggerated facial expressions like pouting or winking, and specific hand gestures such as forming a heart shape with fingers or placing hands on cheeks. The trend is frequently observed among K-pop stars, who are often encouraged by fans to perform aegyo.

While popular in South Korea and online, the trend has drawn mixed reactions globally, with some social media users expressing discomfort with the practice. "The whole concept of aegyo creeps me out," one TikTok user commented, while another stated, "There's NO way ppl genuinely enjoy seeing aegyo."

The study analyzed the Formant 1 (F1) values of vowel sounds produced by male and female speakers aged 25 to 31. Formants, which are acoustic features of speech, are influenced by the shape and length of the vocal tract, primarily the throat. The research demonstrated that aegyo speakers increased their F1 values, indicating a reduction in perceived vocal tract length.

"A shorter vocal tract naturally produces higher resonances, and therefore higher formant frequencies, than a longer one," said co-author Ji-eun Kim. "This is one of the main reasons why children's voices sound so different from those of adults."

Researchers noted this is the inverse of a strategy used in the animal kingdom, where species may lower their larynx to create the impression of a larger body size. "Our findings suggest that humans can use the opposite strategy," Dellwo commented.

The study also explores the potential social function of aegyo. Researchers suggest that adopting a cute vocalization might serve to make an individual more memorable and approachable. "If this is the case, sounding cute may not only make someone appear more approachable, but could also help establish a person's identity in the minds of others, a process that is fundamental at the beginning of any close social relationship," Dellwo added. The research team plans further studies to investigate these potential social implications.