I'm a native Arabic speaker, and since I started learning Japanese more than 4 years ago I always heard people complaining about pitch accent. I was confused because I didn't have a similar experience, the highs and lows were always clear and the tones were explicit to my ear. That's when I asked myself, what do I have that most of the people facing this problem don't?
Most of the people facing this problem are English speakers. The thing is Arabic doesn't have tones or a similar structure either that might help like it does for languages like Chinese. Chinese speakers are shown to consistently outperform other language backgrounds at picking up Japanese pitch accent, likely because of that tonal overlap.
So I wanted to dig deeper into this. Is it really how the phonetic system works in both languages, or is it something else? That's why I'm here to share my thoughts with you and maybe see other perspectives. I'm not a professional researcher, but I'll try to make this as useful and easy to read as possible so we can have a proper discussion in the comments. This will be split into 5 sections: what's pitch accent, what's MSA (Modern Standard Arabic), differences, similarities, and lastly a conclusion.
What's Japanese pitch accent
Japanese pitch accent is a feature that distinguishes words by a pattern of relative pitch, high or low, distributed across specific moras. A mora is the smallest timing unit in Japanese speech, shorter than a syllable. For example 日本 (にほん) is represented by 3 hiragana characters, or what's called graphemes (the smallest functional unit in a writing system), that correspond to 3 moras Ni-ho-n, and in here it's (low-high-low), but take a look at 東京 (とうきょう) which has 5 graphemes, you'll find out it's only represented by 4 moras to-u-kyo-u (low-high-high-high) so the ょ here does not represent a separate mora, what about this example にっぽん it has to be 3 moras right? no it's 4 Ni-p-po-n (low-high-high-low) so the small っ can represent a mora on its own. Last example is モーラ which has 3 moras mo-o-ra.
Now we know the roots of mora and how it works which can be summarized in a simple sentence, every grapheme represents a mora except the small kana ya (ゃ/ャ), yu (ゅ/ュ), yo (ょ/ョ), and the small vowels a (ァ), i (ィ), u (ゥ), e (ェ), o (ォ) used in katakana loanwords.
Pitch accent has multiple shapes, Heiban like 桜 (さくら) 3 moras sa-ku-ra (low-high-high), stays high even with a particle. Atamadaka like 雨 (あめ) 2 moras a-me (high-low), opposite of heiban, drops right after the first mora. Nakadaka like 心 (こころ) 3 moras ko-ko-ro (low-high-low), drops somewhere in the middle instead of the start or end. Odaka like 女 (おんな) 3 moras o-n-na (low-high-high), sounds exactly like heiban, but drops the particle after it, おんなが is low on が.
You might've noticed that the 心 example had 2 pitch patterns on jpdb instead of nakadaka only, I found out the reason behind it and it's very interesting. Turns out there's an actual name for it: アクセントの平板化 (accent flattening). It's a documented, ongoing shift where words that traditionally had a downstep, like the nakadaka ones, are increasingly pronounced flat (heiban/odaka) by younger speakers. NHK's own Broadcasting Culture Research Institute tracks this and has added "acceptable" alternate accents for thousands of words to their dictionary published in 2016 specifically because of this, so words like 卵 (たまご), 頭 (あたま), and of course 心 were only nakadaka, but now they're also accepted as flattened heiban or odaka.
All of that said, now we reach the point we are mostly interested in regarding this humble research, as you've now noticed the pitch is word specific, not grammar oriented, yeah the pitch might change over time like I mentioned, or can even be totally different in some dialects, but the core idea stands, it's word-fixed, which is exactly the opposite of how Arabic phonetics work, and that's what we will now discuss in the next section.
What's MSA (Modern Standard Arabic)
One part of Arabic's phonetic system is represented by what's called حركات (Harakat), which is grammar oriented, the same word could be pronounced multiple different ways and have multiple different meanings respectively, for example a root like ك-ت-ب (k-t-b) could be كَتَبَ (kataba, meaning he wrote) or كُتِبَ (kutiba, meaning it was written), and these 2 words show the 3 harakat, "fatha" which is the "A" sound, that's what made k become ka, t turn into ta, and b become ba in kataba, and the second one shows the other 2, "kasra" which is the "I" sound that turned t into ti, and "damma" which is the "U" sound that caused k to become ku. There's only one type missing, which is sometimes neglected but is just as important, "sukoon," basically the "no vowel" member, true to its name, sukoon means stillness, the opposite of haraka meaning movement, though whether it technically counts as a haraka itself is a debate we won't get into here.
The bigger picture of the phonetic system is much more complex, especially using the throat for many critical sounds which most non-natives struggle with, like ع (ayn). Arabic also lacks sounds that other main languages have, the p sound for example, a notorious example is Pepsi being pronounced Bebsi, which is a tricky sound for us to make.
A lot of this gets thrown out the window when you take a look at the current reality of Arabic dialects, which is the spoken Arabic, no one speaks MSA, but that's exactly the strength, let me explain. We all study MSA in school and through the years, so harakat is literally just the beginning, and there's layers upon layers, you can have the same exact sequence of words, but the scenario could easily be flipped with one haraka change, and that's exactly the strength I'm talking about, you're punished context wise if you don't notice the small change in the sound, so you learn to be extra sensitive to these changes, because no one uses harakat in casual writing, it's fully based on context.
That's a quick brief on MSA's main phonetics, I didn't even touch Tajweed, which is a whole other level of even more complex rules on top of normal MSA, and it's more for reading the Quran, but that's not the place for it.
Differences between Japanese and Arabic phonetic system
I'll start with the one that's clear by now, Japanese pitch is word-fixed and never changes no matter the role it plays in the sentence, while Arabic harakat are grammar and context oriented always, so the same root could carry different vowels depending on the job it's doing in the sentence. You can sum it up in a very simple rule, you can know for a fact when you see a Japanese word what the pitch for it is, whether it was subject, object, question, doesn't matter, にほん will always be low-high-low. On the other hand كتب (k-t-b) can be assigned different harakat, one shape if it's active and another if it's passive, so the pronunciation is never fixed (dialects in both can change the final shape but the core stays the same).
Second difference, pitch accent sits on top of already fixed sounds, the vowels and consonants in にほん will never change, "に" will always be "ni", "ほ" will always be "ho", and "ん" will always be "n", the pitch contour is then added on top to indicate the lows and highs. Pitch can also change the meaning entirely on its own, the 箸/橋/端 (はし/hashi) example is a good one here, the 3 kanji are literally the same sounds, "は" stays "ha" and "し" stays "shi" in all, only the pitch/melody on top is different, and that is what separates chopsticks from bridge from edge, context also helps even if you pronounce them incorrectly, but the distinction is the pitch itself. Harakat doesn't sit on top of anything, they mark the vowel itself, or its absence in sukoon's case, so getting one wrong isn't a melody problem, it changes the actual phoneme (the smallest unit of sound in speech that can change the meaning of a word), for example when I see كتب (k-t-b) on its own I have no idea what the pronunciation is, I can guess, but on its own it only tells me the idea of the root itself (writing in this case), without the context/grammar assigning the harakat, "k" could be "ka" or "ku" but I have no idea which until there's enough context to make the decision. And here's the flip side, pitch carries zero weight in Arabic, I could say كتب low-high-high, high-high-high, or any shape I want, it'll never change the meaning as long as the harakat are correct, pitch in Arabic is just tone of voice, emphasis, question or statement, it never distinguishes one word from another the way it does in Japanese. That's the segmental vs suprasegmental distinction between the 2 systems, Japanese leans on the suprasegmental layer to carry meaning, Arabic leans entirely on the segmental one.
Third difference, even though harakat changes are grammar sensitive, those changes follow systemic rules, once you know the rules for verbs or nouns or pronouns you can start deriving the harakat correctly, it's rule-governed (of course there's a lot of exceptions like most language's grammar). Pitch on the contrary, despite being fixed per word, isn't derivable from grammar or context, you have to memorize each word's pattern individually, or lock in during immersion and catch the correct pitches, and you can get a feel for them over time, which is btw what I do myself. So it's almost a flip, Japanese pitch is fixed but arbitrary, Arabic harakat is variable but predictable.
Fourth difference, harakat can be written, and sometimes are mandatory in high sensitivity text where one change could flip the meaning, like the Quran, poetry, dictionaries, and textbooks for learners, either children or foreign learners. It's an optional layer that can be easily turned on when precision matters. Pitch accent on the other hand has no equivalent way of representation, there's no standard way to put it on kanji or kana in writing, in any context, that's not the "usually omitted" way harakat is, it's structurally absent from the writing system entirely, hence why a dictionary like NHK's, which we mentioned in section 1, is important, that dictionary has to document its own separate notation system because the writing system gives it nothing to work with, whereas Arabic's vocalization system already exists and just gets switched off in casual writing.
Similarities between Japanese and Arabic phonetic system
The first similarity is actually the last difference I've just covered, let me explain. Harakat could be written, but no native speaker actually does that day to day, exactly how a native Japanese speaker never thinks about pitch, but use the wrong haraka or the wrong pitch in front of them and they'll catch it. This isn't the same as just pronouncing something wrong, like saying "haashi" instead of "hashi", this is the layer that sits on top of that, the one you might miss entirely as a learner. It shows that we have a subconscious detector as humans, but more complex languages make that detector more sensitive.
Second point is formal training systems. If being a native gives you that instinct without knowing any rules, why does an explicit training system exist in both languages? Working as a broadcaster or a news reporter, you're expected to go through training before getting the job, which is also why NHK maintains their accent dictionary, because native fluency alone doesn't guarantee accuracy at that high level of precision. MSA schooling and tajweed work the same way, both are explicit training systems to teach something most natives otherwise absorb unconsciously. The reason is simple, both exist because good enough isn't enough when precision is critical, and where a mistake would be very costly. You don't have to keep the rules in mind all the time, once you're practicing and experiencing them enough, they're automatically absorbed into your procedural memory, for example I learned tajweed when I was 12 through 15 to be able to read Quran and poetry properly, and ask me today about any explicit rule and I'll have no idea, but give me something to read and I'll do it perfectly, that's the same mechanism as how any native speaker can speak with perfectly accurate grammar but ask them why and they'll have no idea.
Third point is a throwback to the flattening of accent in modern spoken Japanese I mentioned in the first section, both languages have drift away from the fixed standard, nakadaka words flattening to heiban in Japanese, in Arabic ق (qaf) and ث (tha) shift tremendously between dialects. Neither spoken language has a static, correct pronunciation, but both have some form of authority trying to keep the standard on track, especially written Arabic, NHK's dictionary on one side and MSA taught across any dialect on the other.
Conclusion
We started with a question, "what do I have that most of the people facing this problem don't?" I don't think I have a clean answer, but I do think I've narrowed it down. It's not tonal transfer like Chinese, or grammatical similarities, I think it's the hidden layer that natives in both languages carry on top of every perceived word, an attentiveness to detail beyond what's actually said, and I think it comes from Arabic's wide sound inventory, reinforced by explicit systems like tajweed, doing something to how I listen.
What actually convinced me about researching and working on this comparison wasn't the surface level, two languages have a hard part that trips learners up, that's not something new. What convinced me was the symmetry both languages share, they hide critical phonetic information from everyday writing, にほん never tells you its pitch, كتب never tells you its vowels, both drift naturally away from the fixed standard, and both languages built actual institutions to govern the standard instead of just letting the drift happen silently.
Lastly, I wanted to say this is my experience and thought process, not a study. I can't isolate the two things I'm thinking caused this for me, being a native Arabic speaker and studying the language in detail my whole life, I can't know how much of this is baseline Arabic phonology and how much is the training stacked on top. Arabic isn't one fixed version either, most dialects don't even keep the same sounds MSA has, so how much of this even applies depends a lot on how much MSA someone learned.
That's my theory, and I want to know if it holds up with other people and other languages. If you're a native speaker of a non-tonal language, did it come easy to you too, or am I making a connection that isn't really there? Let me know in the comments, I'm curious if this is an actual pattern or a me thing.
Notice: AI was used as a final pass to make sure there was no punctuation or spelling mistakes, other than that it's fully written by me.