Intonation (linguistics)

Intonation is the variation in pitch used during speech. It is a vital part of how humans communicate through vocal languages. People use pitch to show their emotions or attitudes. It can also highlight specific words to focus a listener's attention. Intonation helps signal the type of sentence being spoken. It can also regulate the flow of a conversation. While it is mostly about pitch, it works with other features like tempo and loudness.

There are several distinct ways pitch moves during speech. Rising intonation occurs when the pitch of the voice goes up over time. Falling intonation happens when the pitch moves down. Some patterns are more complex, such as dipping or fall-rise intonation. In this pattern, the pitch falls and then rises again. Another type is peaking, also known as rise-fall intonation. Here, the pitch rises and then falls. Scientists use the International Phonetic Alphabet to transcribe these movements. They use diagonal arrows to show global rising or falling contours.

Linguists have identified many different functions for intonation. J.C. Wells and E. Couper-Kuhlen each proposed six specific functions. One is the attitudinal function, which expresses emotions. For example, a high pitch might show excitement during a greeting. Another is the grammatical function. In English, a rising pitch can turn a statement into a yes-no question. The focusing function helps show what information is new or already known. The discourse function shows how sentences connect in a conversation. There is also a psychological function that organizes speech into easy units. Finally, the indexical function can act as a marker of social identity.

It is important to distinguish intonation from tone. In tonal languages, such as Mandarin or Hausa, pitch changes the meaning of a word. In these languages, pitch is used to distinguish words or mark grammar. In English, however, intonation is used pragmatically for emphasis or irony. This means the words stay the same, but the pitch changes the intent. This distinction is a key part of linguistic study.

Research into English intonation has followed different paths in Britain and the United States. British descriptions can be traced back to the 16th century. In the early 20th century, experts focused on basic "tunes." Phoneticians like H. E. Palmer studied the nucleus of an intonation unit. The nucleus is usually the main accented syllable. This nucleus can be preceded by a head or a pre-head. It can also be followed by a tail. Later, researchers like Halliday focused on three variables: tonality, tonicity, and tone.

American approaches to intonation developed differently. From the 1940s to the 1990s, many used the idea of pitch phonemes. Researchers Trager and Smith identified four levels of pitch: low, middle, high, and very high. Kenneth Pike used a different numbering system for these same levels. Linguist Dwight Bolinger argued that pitch contours were more important than individual levels. He showed how pitch can indicate sarcasm or enthusiasm. For instance, the word "Great" can mean different things depending on the pitch contour used.

Intonation also helps clear up confusion in spoken language. In writing, some questions can look ambiguous. For example, a choice between juice or soda might look like a yes-no question. However, intonation removes this doubt. A speaker can use a falling pitch to show it is an alternative question. A rising pitch can signal a yes-no question instead. This ability to signal intent makes intonation a fundamental system for human interaction. It connects our physical voice to our complex social meanings.