Phonetics

People use many ways to share ideas.

Some people use their mouths to speak. They use their ears to hear.

Other people use their hands to sign. They use their eyes to see the signs.

Making sounds is a big job for the body. Your brain picks the words you want to say. Then, your muscles move to make the sounds.

Your tongue can move in many ways. It can touch your teeth. It can touch the roof of your mouth.

These small moves change how you sound. It is amazing how we talk!

Have you ever thought about how we make sounds? This study is called phonetics. It looks at how we make and hear speech.

Some people use their mouths to speak. They use their ears to hear. Others use sign language. They use their hands to sign. They use their eyes to see.

Making sounds is a big job for the body. First, your brain picks a message. Then, it picks the right words. Next, your brain plans the sounds. It sends commands to your muscles. Finally, your muscles move to make the sound.

Your mouth and throat change the sounds you make. We call these places of articulation. Some sounds use your lips. These are called labial sounds. For example, you use both lips to make a "p" sound. Other sounds use your tongue. These are called lingual sounds. Your tongue can touch your teeth. It can also touch the ridge behind your teeth. These small moves help us say different words.

Phonetics is a special branch of linguistics. It is the study of how we make and hear speech sounds.

People who study these physical properties are called phoneticians. They look at how sounds are made by the body. They also look at how our ears or eyes catch those sounds. This field is divided into three main parts. Articulatory phonetics studies how we move our bodies to speak. Acoustic phonetics looks at the physical properties of the sounds themselves. Finally, auditory phonetics studies how we perceive or hear those sounds.

Making a single sound is a very busy process for your body. It starts when your brain plans a message. Next, you must pick the right words, which are called lexical items. This step uses semantic information, which is the meaning of the words. After that, your brain moves to phonological encoding. This part assigns sounds called phonemes to your words. These phonemes have specific goals, like closing your lips. Your brain then sends muscle commands to your mouth or hands. Finally, your muscles move to create the actual speech sounds.

People have studied these sounds for a very long time. As early as the 6th century BCE, Sanskrit grammarians began this work. A famous Hindu scholar named Pāṇini wrote a very important grammar. His work is still very influential in modern linguistics today. He described how sounds are made using the vocal folds. In Sanskrit, this study of sounds is called Shiksha. The Taittiriya Upanishad defines Shiksha as the study of sounds and accents.

Modern phonetics has changed a lot with new technology. The term "phonetics" was used in its current way around 1841. Alexander Melville Bell created a tool called "visible speech" to help children. This was a phonetic alphabet based on how the mouth moves. He also described nine cardinal vowels to help people learn sounds. In the 1960s, a researcher named Peter Ladefoged studied these vowels. He used experiments to show how people actually hear them.

We can group sounds by where they are made in the mouth. These spots are called places of articulation.

Some sounds are labial, which means they use the lips. For example, a "bilabial" sound uses both lips together. Other sounds are lingual, which means they use the tongue. You can make sounds by touching your teeth, which are dental. You can also touch the ridge behind your teeth, called the alveolar ridge. Even sign languages like ASL use these same ideas of movement.

Phonetics is a specialized branch of linguistics. It focuses on the physical properties of speech sounds. Specifically, it examines how sounds are articulated and how they are perceived.

Scientists who study these physical properties are called phoneticians. They distinguish between the phone, which is a physical speech sound, and the phoneme. A phoneme is an abstract unit within a specific language. These units are the smallest elements that can change the meaning of a word.

Phonetics is traditionally organized into three distinct sub-disciplines. Articulatory phonetics studies the physical movements used to produce sounds. Acoustic phonetics examines the physical properties of the sounds themselves. Auditory phonetics investigates how those sounds are perceived by a listener.

This study applies to different communicative modalities. Oral-aural languages, like English, use the mouth for production and ears for perception. Manual-visual languages, like American Sign Language (ASL), use hands for production and eyes for perception. Some tactile signing methods even allow deafblind speakers to produce and perceive signs through touch.

Language production is a complex, multi-stage process. It begins when a speaker identifies a message to be encoded. First, the speaker undergoes lexical selection. This is the process of choosing individual words, known as lexical items. This selection relies on semantic information, which is the meaning of the words. Once words are chosen, the brain moves to phonological encoding.

During this stage, the mental representation of words is assigned phonological content. This content consists of a sequence of phonemes. These phonemes are assigned specific articulatory features, such as a certain tongue position. Finally, the brain coordinates these features into muscle commands. These commands trigger the physical articulation of the intended speech sounds.

Humanity has studied these processes for thousands of years. The earliest known phonetic studies were conducted by Sanskrit grammarians in the 6th century BCE. A famous Hindu scholar named Pāṇini is a central figure in this history. He wrote a four-part grammar that remains highly influential today. His work is described as the most complete generative grammar ever written for any language.

Pāṇini described important principles like voicing. He noted that resonance is produced by tone when vocal folds are closed. Resonance is produced by noise when vocal folds are open. In Sanskrit, this study is called Shiksha. The Taittiriya Upanishad defines Shiksha as the study of sounds, accentuation, and vowel quantity.

Modern phonetics saw significant advancements after the 1800s. The term "phonetics" began to be used in its current sense around 1841. New medical developments and recording devices provided researchers with much more detailed data. Alexander Melville Bell developed an influential system called "visible speech." This was a phonetic alphabet based on articulatory positions. It became a vital tool for the oral education of deaf children. Bell also developed a description of nine cardinal vowels. These were defined by vowel height and backness to help anchor phonetic perception.

However, in the 1960s, Peter Ladefoged used experimental evidence to challenge this. He argued that cardinal vowels were auditory targets rather than articulatory anchors.

We can categorize many sounds by their place of articulation. This refers to where a constriction occurs in the vocal tract.

Consonants are sounds made by a full or partial constriction. Labial articulations involve the lips. These include bilabial sounds, made with both lips, and labiodental sounds, made with the bottom lip and upper teeth. Linguolabial sounds involve the tongue blade and the upper lip. Lingual articulations involve the tongue. These are further divided into coronal, dorsal, and radical categories. Coronal sounds use the front of the tongue. Dorsal sounds use the back of the tongue. Radical sounds are produced in the pharynx.

Detailed movements allow for a vast variety of speech sounds. Coronal articulations include dental, alveolar, and post-alveolar locations. Dental consonants are made with the tongue touching the teeth. These can be apical, using the tongue tip, or laminal, using the tongue blade. Alveolar consonants are made at the alveolar ridge just behind the teeth. The agility of the tongue allows for many different postures. For example, a speaker can use apical, laminal, or even sub-apical postures. These precise physical movements are what allow humans to communicate complex ideas through sound and sign.