Elliot Kim
Babies are able to differentiate most sounds soon after birth, and over the following months, they become language-specific listeners. Researchers are still trying to understand how babies recognize 'contrastive' sounds, or the differences between speech sounds that can change meaning. For example, the b sound in ball and the d sound in doll are contrastive sounds. Studies have shown that babies can differentiate sounds based on context clues, such as neighboring sounds. By six months of age, babies should be able to turn and look at the source of a sound, and they may be able to differentiate between happy and angry tones of voice.
| Characteristics | Values |
|---|---|
| Ability to differentiate sounds | Babies can differentiate most sounds soon after birth |
| Language-specific listening | Over the months following birth, infants become language-specific listeners |
| Interpretation of acoustic differences | An infant's ability to interpret acoustic differences as either contrastive or non-contrastive may come from the contexts in which they hear different sounds |
| Differentiation based on context clues | Babies can differentiate sounds based on context clues, such as neighboring sounds |
| Perceptual narrowing or reorganization | At around 6 months of age, infants start to lose the ability to tell apart many sounds that are not used contrastively in their native language |
| Tuning in and out of languages | Babies are "tuning in" to their native language while also "tuning out" languages that they don't hear regularly |
| Preference for human language | Babies prefer human language to other noises |
| Differentiation between familiar and unfamiliar phonetic sounds | Babies can distinguish between familiar and unfamiliar phonetic sounds before they are able to speak in their L1s |
| Hearing all frequencies simultaneously | Babies hear all frequencies simultaneously so they can respond to unexpected sounds |
| Detection of noise | Babies are better at detecting noise than tones |
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What You'll Learn
- Babies can differentiate most sounds soon after birth
- They become language-specific listeners in the following months
- They can differentiate sounds based on context clues, such as neighbouring sounds
- They can distinguish between familiar and unfamiliar phonetic sounds
- They hear all frequencies simultaneously to respond to unexpected sounds
Babies can differentiate most sounds soon after birth
The world of a newborn baby is filled with a cacophony of sounds. Babies hear all frequencies simultaneously, which can make it difficult for them to distinguish a single sound from all the surrounding noise. However, infants can differentiate most sounds soon after birth, and over the following months, they become language-specific listeners.
Research has shown that babies can differentiate sounds based on contextual clues, such as neighboring sounds. For example, they can distinguish between familiar and unfamiliar phonetic sounds well before they are able to speak. This is evident in their ability to recognize the difference between speech sounds that change the meaning of words, such as the "b" sound in "ball" and the "d" sound in "doll".
Babies are also able to distinguish between human speech and other noises from a very young age. They show a preference for human speech sounds and words formed by possible combinations in their native language. This preference for human speech can be observed through their increased sucking frequency on a pacifier when they are attentive to human speech sounds.
As babies grow, they start to lose the ability to tell apart many sounds that are not used contrastively in their native language. This phenomenon, known as perceptual narrowing or perceptual reorganization, occurs gradually, with changes in vowel sounds happening first (around 6 months) and changes to consonants later (around 10-12 months). During this period, babies are becoming "experts" in their native language while also "tuning out" languages that they don't hear regularly.
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They become language-specific listeners in the following months
Infants can differentiate most sounds soon after birth, and over the following months, they become language-specific listeners. This phenomenon is called "perceptual narrowing" or "perceptual reorganization".
During this period, babies are becoming "experts" in their native language. They are 'tuning in' to their native language and 'tuning out' languages that they don't hear regularly. This process starts at around 6 months of age when infants begin to lose the ability to tell apart many sounds that are not used contrastively in their native language. For example, a child exposed to English loses the ability to tell the difference between different types of 't' sounds, whereas a child exposed to Hindi or Urdu would retain this ability as the differences in sounds are used to mark differences in meaning.
The context in which babies hear different sounds also plays a role in their ability to interpret acoustic differences as either contrastive or non-contrastive. For instance, Japanese, Dutch, and French adults have difficulty producing and hearing the difference between "l" and "r" sounds because their languages do not use these sounds contrastively to change the meaning of words.
Babies are also better at detecting noise than tones. They respond to unexpected sounds and can distinguish between familiar and unfamiliar phonetic sounds well before they are able to speak. They can tell the difference between all kinds of different sounds from many different languages.
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They can differentiate sounds based on context clues, such as neighbouring sounds
The world of sounds is very different for infants compared to adults. Infants hear all frequencies simultaneously, which can make it challenging for them to differentiate a single sound from the surrounding noise. However, they can differentiate most sounds soon after birth and gradually become language-specific listeners over the following months.
While researchers are still unraveling the intricacies of how babies recognize "contrastive" sounds, which refer to differences in speech sounds that change meaning, context clues play a pivotal role in this process. Specifically, babies can differentiate sounds based on neighboring sounds. This ability to interpret acoustic differences as either contrastive or noncontrastive is shaped by the contexts in which they hear various sounds.
For instance, a child exposed to English might struggle to differentiate between various "t" sounds, such as dental /t/ and retroflex /t/, as these nuances don't alter the meaning in that language. In contrast, a child learning Hindi or Urdu would retain this ability since these subtle distinctions carry distinct meanings in those languages.
The research by Hitczenko and Feldman sheds light on this phenomenon by comparing data from Japanese, Dutch, and French. Their findings underscore the significance of context in shaping an infant's interpretation of acoustic differences. As babies grow, they become adept at recognizing the nuances of their native language while gradually losing the ability to discern certain distinctions in languages they are not regularly exposed to.
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They can distinguish between familiar and unfamiliar phonetic sounds
A baby's ability to distinguish between phonetic sounds is quite remarkable. Newborns can perceive all the speech sounds of the world's languages, which is around 600 consonants and 200 vowels. However, this ability to differentiate between all sounds begins to change at around 6 months of age. This is when infants start to lose the ability to tell apart sounds that are not used contrastively in their native language. This phenomenon is called perceptual narrowing or perceptual reorganization.
During this period, babies become "experts" in their native language. They are still able to distinguish between familiar and unfamiliar phonetic sounds, even before they can speak. For example, a baby exposed to English will lose the ability to tell the difference between various types of 't' sounds, such as dental /t/ and retroflex /t/, while a baby exposed to Hindi or Urdu will retain this ability as these sounds have different meanings in those languages.
Research has shown that babies can differentiate sounds based on contextual clues, such as neighboring sounds. For instance, Japanese, Dutch, and French adults have difficulty differentiating between the "l" and "r" sounds because their languages do not use these sounds contrastively to change the meaning of words. However, babies exposed to these languages can differentiate between these sounds at a young age.
Studies have also shown that infants show a preference for words formed by possible combinations in their native language. They are more attentive to human speech sounds and can distinguish between actual language and "baby talk." They can also detect noise better than tones, and they respond to unexpected sounds by turning toward the sound or changing their activity level.
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They hear all frequencies simultaneously to respond to unexpected sounds
The world of sounds that babies experience is very different from that of adults. This is because babies hear all frequencies simultaneously, which can make it challenging for them to distinguish a single sound from the surrounding noise. This ability to hear across all frequencies allows babies to respond to unexpected sounds.
Lynne Werner, a professor of speech and hearing science at the University of Washington, conducted a study to understand this phenomenon better. The study involved testing 73 infants aged 7 to 9 months and 40 adults aged 18 to 30 years old, all with normal hearing. The participants were exposed to four half-second bursts of a 1000-hertz tone and a 1000-hertz broadband noise, sometimes masked with background noise. The results showed that babies were relatively better at detecting noise than tones, especially in quieter conditions.
Babies' superior ability to detect noise compared to tones can be explained by their hearing capabilities. As they hear all frequencies at once, they are generalists, able to respond to a variety of sounds. In contrast, adults typically hear within a narrow band of sound, focusing on specific sounds while filtering out others. This difference in hearing abilities between babies and adults can make it challenging for infants to distinguish individual sounds in a noisy environment.
Additionally, babies can differentiate sounds based on contextual clues, such as neighboring sounds. For example, they can distinguish between "ball" and "doll" by recognizing the contrastive sounds "b" and "d," which change the meaning of the word. This ability to interpret acoustic differences as contrastive or noncontrastive may be influenced by the contexts in which they hear different sounds.
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Frequently asked questions
Babies can differentiate most sounds soon after birth. They hear all frequencies simultaneously, making it difficult for them to distinguish a single sound from all the surrounding noise. They respond to unexpected sounds and are better at detecting noise than tones.
Babies can differentiate between familiar and unfamiliar phonetic sounds before they are able to speak. They become language-specific listeners in the months following birth, and they are able to interpret acoustic differences as either contrastive or non-contrastive based on the context in which they hear different sounds.
An example of a contrastive sound is the difference between the “b” sound in "ball" and the "d" sound in "doll". Another example is the difference between the English /ɹ/ and /l/ sounds, which are difficult for native Japanese speakers to distinguish because neither segment is part of the Japanese phoneme inventory.
Researchers have tested babies' ability to differentiate sounds by measuring their sucking frequency on a pacifier or by observing their facial expressions and where they look. Another method is the head-turn paradigm, where babies are trained to respond to a sound by turning their heads.
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