Tone (linguistics)

In linguistics, tone refers to the use of pitch to change meaning. This can involve a pitch contour, which is the shape of the sound. It can also involve a pitch register, which is the height of the sound. In tonal languages, these pitch changes distinguish one word from another. This is similar to how consonants and vowels change meaning in English. Scientists sometimes include phonation in this definition. Phonation describes how the vocal cords vibrate during speech.

Most spoken languages use pitch for intonation. Intonation helps express emotions or emphasis. For example, your voice might rise when asking a question. However, in tonal languages, pitch is used for lexical or grammatical meaning. This means the pitch is a permanent part of the word. These specific patterns are called tonemes. Tonal languages are common in East and Southeast Asia, Africa, and the Pacific. They are also found among indigenous people of the Americas.

Tonal languages work through specific mechanics. Every syllable in a tonal language has an inherent pitch contour. This contour can be held steady or slide up and down. Some syllables might even follow a complex combination of movements. When two words have the same consonants and vowels but different tones, they are called minimal pairs.

In some languages, like Punjabi, the tone can span an entire word rather than just one syllable. In other cases, tones can interact through a process called tone sandhi. This is when tones affect each other during speech.

There are different ways to classify these systems. One way is by looking at register tones and contour tones. Register tones are distinguished by their pitch level relative to each other. Contour tones are distinguished by their shape, such as rising or falling. Many languages, like Cantonese, use a combination of both.

Another way to classify them is by how they apply to syllables. In Cantonese and Thai, each syllable has its own tone. In contrast, languages like Swedish or many Bantu languages use tone at the word level. This means the tone shape operates across the whole word.

Mandarin Chinese provides a clear example of tone in action. It uses five distinct tones. These are often written with marks called diacritics over the vowels. The syllable "ma" can change meaning based on the pitch used. For instance, one tone makes it mean "mother," while another makes it mean "horse."

This variety allows for complex tongue-twisters. One famous Mandarin tongue-twister asks if a mother is scolding a horse's hemp. This demonstrates how vital precise pitch is for clear communication.

Vietnamese also features a complex system with six different tones. These tones have specific names and descriptions. For example, the "ngang" tone is flat, while the "sắc" tone is sharp or rising. The "nặng" tone is described as heavy.

These tones are often marked with diacritics to help readers. In some dialects, the way these tones sound can change. For example, the "huyền" tone is a low falling sound. The "hỏi" tone is an asking tone that falls and then rises.

Tone is also closely linked to phonation in several languages. Phonation can be pitch-dependent or pitch-independent. In Vietnamese, some tones are distinguished by glottalization. Glottalization is a specific way the vocal cords move. Some tones are breathy, while others are creaky. In Burmese, pitch and phonation are so intertwined they form a single system called a register. This shows that tone is multidimensional. It is not just about how high or low a sound is. It also involves duration and how the voice vibrates.