Wait… Is Korean Becoming Tonal Again?

Added: 2026-06-04

[00:00:00]If you've ever looked into learning East Asian languages, you are probably told that Korean is basically the one non-tononal language. Mandarin, Cantonese, Shanghai, essentially all Chinese languages have tones. Japanese has pitch accent. Korean is the one language where you don't have to deal with all that.

[00:00:21]I'm sorry to tell you, but that may be changing. Let me break down the latest discovery in Korean linguistics.

[00:00:36]So, in Korean, one of the first things they'll teach you is that there is a three-way distinction in stop consonants at the beginning of words. Plain consonants, aspirated consonants, and tense consonants produced by tightening of the throat. I remember my Korean teacher would hold a tissue up to her mouth and say these three words.

[00:00:59]G C.

[00:01:04]This is how we were taught the difference between plain and aspirated consonants and how much they make the air move. And linguists measure it using something called voice onset time or VOT. VOT just means how long it takes for your vocal cords to start vibrating after you release the consonant. A little linguistics 101 lesson here.

[00:01:26]Almost all vowels are voiced, meaning your vocal cords are vibrating when you produce them. But not all consonants are voiced. The consonants we're talking about here are not voiced at the beginning of words. So the vote is how long it takes for the vowel to come in with full voicing after you've released the sound. For plain consonants, the burst of air is very short, so they have a shorter vote. Aspirated consonants, by contrast, have a much longer burst of air or longer vot.

[00:01:57]For the many decades linguists have been doing research on Korean, this has been the case. However, in the past 20 years or so, linguists have started to see a shift away from this. A paper from 2014 measured the VOT of plain and aspirated consonants as produced by 170 solit gap has been shrinking over the past few decades. The VOT convergence is strongest in females and in fact in many young female solites born in the 1980s or later there's no longer a reliable VT gap between the two types of consonants.

[00:02:35]So the linguist did some more digging and found that while the vot gap between the plain and aspirated consonants have been shrinking, something else has been quietly replacing it.

[00:02:48]Its tones. The one thing that people told you Korean doesn't have. Well, I hate to break it to you, but it's starting to happen to Korean.

[00:02:58]But before we go any further, a quick shout out to the sponsor of today's video, Maku. If you're learning Korean, you've probably noticed that there is a big gap between understanding it on paper and how it sounds in real life.

[00:03:11]That's why so many people struggle to get fluent. Migaku is built from learning around real content. So, for example, you can be watching a Kdrama or something on YouTube, Netflix, or Disney Plus. You see a word you don't know, you click it to learn its meaning instantly, and then you can turn that exact sentence into a flashc card with its original audio. They also have structured Korean courses that cover hunger, pronunciation, grammar, and vocabulary step by step. As someone who has spent 15 years learning Korean, I can say that although Hungar is easy to learn and straightforward, Korean has dozens of sound changes that aren't officially taught, but are used on the regular. Maku teaches them, too. And one thing I really like is that you're not tied to a computer anymore. You can do the same thing on your phone. They also have an OCR feature where you can take a picture of real life Korean and instantly turn that into something you can study. Check out the link in the bio for a Juie exclusive discount. Right now, they're offering 50% off the lifetime plan, plus an additional free month on monthly and yearly plans. And with one subscription, you get access to all the language they support, not just Korean. And now back to the video. As a native Mandarin speaker, back when I first started learning Korean, I always felt that aspirated sounds were higher in pitch than the plain sounds. It just felt very clear and obvious to me. But in my entire 15 years of speaking Korean, I've never had any Korean person or even a Korean teacher mentioned the idea. I thought it was all in my head.

[00:04:54]That's when I did my PhD in linguistics and I realized that Korean linguists have known this phenomenon for a long time. Earlier on when linguist studied Korean stop consonants in the 1960s and the '7s, the primary distinguishing feature was vot like I mentioned before.

[00:05:13]But at the same time, there was already a difference in F0 or pitch. At that stage, however, pitch was largely redundant and it didn't carry phological weight. Over the past two decades, however, this pattern has begun to shift. The V difference has weakened and the F0 difference has become much more prominent. So it isn't that the vote difference shrinking caused tonal distinctions to appear, but rather Korean consonants long had both VT and pitch differences to begin with. What's happening is that because the VT difference is fading, speakers and listeners are relying more on the pitch differences to distinguish the sounds.

[00:05:59]So this is starting to sound like early stage tonogenesis. How tones began to develop in a language. I recently made a video about how tonogenesis happened in East and Southeast Asia. So you can watch that here.

[00:06:13]If we zoom out, this tonogenesis thing that's starting to happen in Soul actually isn't an isolated case. There are actually dialects of Korean today where pitch already plays a big role in distinguishing words. For example, dialects from the southeastern Kyouongo region, places like Pusan and Teu, they already have a system where pitch can differentiate words. Linguists usually describe this as a pitch accent system similar to what exists in Japanese. And speaking of pitch accent, I get asked this question a lot. What is the difference between tones and pitch accent? The main difference is that in tonal languages, each syllable is associated with its own tone. And this happens a lot in languages like Mandarin and Vietnamese where the pitch contrasts are widespread across syllables. Even though these pitches can interact with each other in speech, pitch accent languages usually have more limited pitch contrast organized at the level of the whole word. So instead of every syllable having a full tone, each word has a specific pitch pattern. usually involving a rise or drop in pitch at a certain point. A good example of pitch accent in the Kongang dialect is kazzi.

[00:07:31]In standard soul Korean, kaji can mean type, eggplant, and branch. And you have to rely on the context to tell them apart. But in the kungu dialect, kadi is type, kadi is branch, and kadi is eggplant. What's even more interesting is that the pitch accent in is not a random phenomenon, but rather a remnant of middle Korean, an older system that's been preserved in that region. You may have heard that Korean used to be tonal, which isn't 100% accurate, but in the 15th and 16th centuries, the language used pitch distinctions much more systematically to differentiate words.

[00:08:16]We know this because of these little dots we see in writings from the Tolson dynasty. When Kings Hjong and his scholars created Hungar in 1443, they didn't just design a system for consonants and vowels. They also included a way to mark pitch. Words could be written with no dot, one dot, or two dots. A syllable with no dot was associated with a lower pitch. A syllable with one dot was high. and a syllable with two dots indicated a rising pitch, starting low and moving higher. It's important to note that although there was a system for marking pitch, this did not mean that middle Korean had a fullyfledged tonal system like Mandarin or Vietnamese. In most words, one syllable stood out with a higher or a rising pitch while the rest of the syllables were lower. Eventually, these pitch distinctions disappeared in sole Korean and the dots also disappeared from writing. However, there are still remnants of these pitch patterns in some modern words today. For example, nun in modern Korean means both I and snow. But in middle Korean, I had a low pitch and snow had a rising pitch.

[00:09:33]And because producing a rising pitch requires the voice to move upward over the course of the syllable, it naturally takes more time, which led to a slightly longer duration. And even after the pitch distinctions disappeared, this length difference sometimes remained.

[00:09:50]And nowadays, some older speakers still pronounce snow non slightly longer than I noon. However, those differences have largely disappeared in younger speakers.

[00:10:03]Which brings us back to the present.

[00:10:06]What does all this research mean? Is Korean really becoming a tonal language?

[00:10:11]Not so fast. A more recent study from 2024 found that this shift, it doesn't happen equally in all contexts. It depends on something called procity, which basically means the rhythm and phrasing of speech. Think of it like this. Not all the syllables in a sentence are created equal. Some occur at the beginning of a phrase where speakers naturally pronounce sounds more clearly and they reset their pitch from the previous phrase. This is called a preodically strong position. Other syllables occur inside of a phrase where the speech is more connected and it's less emphasized and these are called preodically weak positions. In this study, 12 Koreans in their 20s read rhythmic versel-like sentences designed to control phrasing. These sentences include plain and aspirated middle pair words in different prisic positions such as phrase initial and phrase medial, allowing researchers to compare how pitch and vote varied across strong and weak contexts. The researchers found that when these consonants appear at the beginning of a phrase, the old VT differences disappears almost completely leading to more reliance on the pitch.

[00:11:27]But inside of a phrase where the consonant is preodically weaker, the old vote differences are usually still hanging on. So linguists are not quite saying that Korean is turning into a tonal language. It's that pitch is becoming increasingly more necessary for distinguishing certain consonants in certain places. And remember what I mentioned earlier, this change is strongest in young female speakers in soul in both the 2014 study and the recent 2024 study. And that's not random. In social linguistics, women often lead sound changes, especially in standard dialects used in the media, education, and public life. But for those of you learning Korean, there's no need to worry about tones just yet. For most intents and purposes, Korean is still not a tonal language. It's not even a pitch accent language, except in Kyongo. And like all languages, the best way to learn is to just listen and speak a lot. If you're still watching, drop me a comment and let me know what issues you're having with learning Korean, and I'll respond to each one of these with a personalized suggestion. If you're struggling with something in Korean right now, that was probably me five or 10 years ago. So, I got your back. See you in the next video. Bye.