K-Pop 'Aegyo' Voice Scientifically Explained: It's Not a 'Shortened Tongue'

The distinctive "aegyo" vocalizations of K-pop idols, often perceived as a "cute" or "childlike" way of speaking, have been scientifically analyzed, revealing the precise acoustic mechanisms behind this popular form of expression. A study published in the Journal of the Acoustical Society of America delves into the "aegyo" speech of the K-pop group Tomorrow X Together (TXT), challenging common assumptions about its production.

While "aegyo" is frequently described as speaking with a "shortened tongue," akin to how young children might speak, the research conducted by Professor Kim Ji-eun from Duksung Women's University and Professor Volker Dellwo from the University of Zurich indicates a different physiological process. The study focused on how the vocal tract changes when adults use "aegyo" speech to convey charm and cuteness.

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The study found that when adults use aegyo speech, the tongue is lowered and the larynx is raised, shortening the vocal tract to sound like a child.

Researchers observed that "aegyo" 발화 (speech) involves lowering the tongue and raising the larynx. This action effectively shortens the vocal tract, creating a resonance that mimics the acoustic properties of a child's voice. Specifically, the study found a significant increase in the first formant frequency (F1) across all vowels during "aegyo" speech. This increase is associated with a shorter vocal tract, a characteristic more prominent in children.

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This research suggests that humans can use the opposite strategy, making themselves appear smaller and younger than they actually are.

Professor Dellwo noted that while many animal species lower their larynx to appear more threatening by lengthening their vocal tract, humans can employ the opposite strategy. "This research suggests that humans can use the opposite strategy, making themselves appear smaller and younger than they actually are," he stated in a press release. This vocal tactic might serve evolutionary or social purposes, potentially eliciting protective responses from others and fostering stronger social connections.

The study suggests that adopting a childlike voice can be a tool for approachability and memorability in social interactions. It highlights how "aegyo," far from being just a superficial trend, involves complex physiological adjustments that serve distinct social and potentially adaptive functions, contributing to the global appeal of K-pop culture.

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Childlike voices can be a means of approaching others and making them remember you better.