Native listening and learning new sounds

I hear what you don’t hear

Have you ever listened to a language you don’t know and thought you recognized a word—only to realize later that you were completely mistaken? Our ears play tricks on us.

A while ago, I ran a small experiment with my German students. I played them two short sentences in Czech, my native language, and asked them to transcribe what they heard. The results were fascinating.

For example, about 90% of the forty students wrote down the Czech word malí [maliː] ‘small’ as mani [maniː]. To me, this seems puzzling—there is no n in the word! But for my students, the Czech l-sound somehow resembled the German n-sound. None of the Czech speakers I consulted ever had this impression.

This little classroom experiment shows something important: we don’t all hear sounds the same way. Our ears—or better said, our brains—are tuned by the language(s) we grow up with.

Why do we hear differently?

Long before we speak, we are already great language users. Research shows that newborn babies can already distinguish speech sounds from noises. Even more surprisingly, they are able to recognize the rhythm of their native language from a non-native one before birth.

After birth, infants are surrounded daily by an enormous amount of speech input. Step by step, they build categories for the sounds of their native language. Up until around 8 to 12 months they can distinguish nearly all of the world’s speech sounds, even those that never appear in their environment.

A Japanese baby, for example, can hear the difference between r and l just as well as American or German babies can. But this ability does not last. As children grow, their brains focus on the categories that matter in their own language and ignore the rest—like the difference between r and l. This is why many Japanese adults often find it notoriously difficult to distinguish the two consonants in languages like English. What was once easy for the baby can become very challenging for the adult.

We perceive foreign languages through native filters

Learning the sound system of a language doesn’t stop with vowels and consonants. It also includes rhythm and intonation. And even for individual sounds like a or o, it’s not only about how you articulate them but also how long you hold them. This brings us to segmental quantity, or length. It refers to the use of duration (short vs. long) of vowels or consonants to distinguish lexical meaning. Quantity shows remarkable cross-linguistic variation.

The case of long consonants in Italian

What feels natural in one language may not exist in another. Take Italian. It belongs to just 3.3% of the world’s languages that distinguish short from long consonants (Ladefoged & Maddieson 1996).

This contrast appears in more than 1,800 Italian words, such as papa /ˈpapa/ ‘Pope’ versus pappa /ˈpapːa/ ‘porridge’ (Image 1). To be understood and to speak well, learners must get long consonants (called geminates) right—although it can be very challenging (e.g., Altmann et al. 2012).

Cross-linguistic differences in learners

In our project “Production and perception of geminate consonants in Italian as a foreign language”, we examine how Czech, Finnish, German, and Spanish learners acquire this feature.

The selection of these languages is not random. They all handle consonant length differently. German, for example, has no consonant length but contrasts short and long vowels in stressed syllables (e.g., Stadt [ʃtat] ‘city’ vs. Staat [ʃtaːt] ‘state’). Czech, like German, distinguishes vowel length, but unlike German, it does so in both stressed and unstressed syllables (e.g., nosí [ˈnosiː] ‘(s/he) carries’ vs. nosy [ˈnosɪ] ‘noses’). Finnish is the most similar to Italian, since it has both vowel and consonant length (e.g., muta [ˈmutɑ] ‘mud’ vs. mutta [ˈmutːɑ] ‘but’). And finally, Spanish has no length contrasts at all.

This diversity allows us to test how a learner’s native language shapes the way they hear and produce length in Italian.

How good are learners at perceiving length in Italian?

In a laboratory setting (Image 2) and by means of a perception experiment, we tested and compared 20 Czech, 20 Finnish, 20 German, and 20 Spanish learners of Italian.

We used 45 short nonsense words that followed Italian spelling and sound rules but had no meaning. Each word had two versions, differing only in whether a consonant was short or long (e.g., sàpolo vs. sàppolo; milèta vs. millèta).

The words covered different consonants and stress positions and were recorded by a native Italian speaker. In every trial, participants had to answer the question: “Does the audio pair you hear belong to the same or different word?”

What we found

First language has great impact! Finnish learners, whose native system is closest to Italian, were the most accurate in hearing the difference between short and long consonants.

Czech learners followed, while German and Spanish learners struggled more (Image 3). Other factors also played a role. Learners heard contrasts more easily when the crucial sound appeared in stressed syllables, and some consonants were easier to notice than others.

Proficiency helped too—advanced learners did much better than beginners.

However, it is unexpected that the German group scored lower than the Spanish group—sometimes research simply surprises us!

Many factors could explain this, since every learner has their own story. Things like previous language experience, weekly study time, exposure to Italian, time spent in Italy, Italian friends, motivation, and personal talent can all play a role.

In our case, German learners had spent fewer hours per week learning Italian and had less experience studying or staying in Italy. Immersion—the experience of being surrounded by a language in real-life settings—seems a plausible factor behind their performance.

Why perception matters in language learning?

Why does pappa sometimes turn into papa in the ears of Italian learners? Because we all hear foreign languages through the features we are familiar with.

Our experiment showed that perception is difficult—but it can be improved. The key is to notice what is different and to train your ears. This means: Pronunciation training must start with perception (e.g., Colantoni et al. 2021).

In the end, learning a language is not just about new words—it’s about learning to hear differently.

References

Altmann, H.; Berger, I., & B. Braun (2012). Asymmetries in the perception of non-native consonantal and vocalic contrasts. Second Language Research 28(4), 387–413.
Colantoni, L., Escudero, P., Marrero-Aguiar, V., & J. Steele (2021). Evidence-based design principles for Spanish pronunciation teaching. Frontiers in Communication, 6, 639889.
Ladefoged, P., & I. Maddieson (1996). The sounds of the world’s languages. Oxford: Blackwell.

Acknowledgement

This blog post was written as part of the DFG-project “Production and perception of geminate consonants in Italian as a foreign language: Czech, Finnish, German and Spanish learners in contrast”, funded by the German Research Foundation (Project number 521229214) and executed at the Free University of Berlin. Project website: https://italiangeminates-project.com/