In linguistics, prosody () is the study of those elements of speech, including intonation, stress, rhythm and loudness, that occur simultaneously with individual sound segments: vowels and consonants. Often, prosody specifically refers to such elements, known as suprasegmentals, when they extend across more than one segment.Crystal, David (2008). "Prosody" and "Suprasegmental". Dictionary of Linguistics and Phonetics, 6th edition. Blackwell Publishing.Bruce, Gösta (2026). The melody and rhythm of speech. General and Swedish prosody. Lund University Press.|url=https://www.lunduniversitypress.lu.se/books/9584465/|
Prosody reflects the nuanced emotional features of the speaker or of their utterances: their obvious or underlying emotional state, the form of utterance (statement, question, or command), the presence of irony or sarcasm, certain emphasis on words or morphemes, contrast, focus, and so on. Prosody displays elements of language that are not encoded by grammar, punctuation or choice of vocabulary.
Attributes of prosody In the study of prosodic aspects of speech, it is usual to distinguish between auditory measures (subjective impressions produced in the mind of the listener) and objective measures (physical properties of the sound wave and physiological characteristics of articulation that may be measured objectively). Auditory (subjective) and objective (acoustic and articulatory) measures of prosody do not correspond in a linear way. Most studies of prosody have been based on auditory analysis using auditory scales.
Auditorily, the major prosodic variables are:
pitch of the voice (varying between low and high) length of sounds (varying between short and long) loudness, or prominence (varying between soft and loud) timbre or phonatory quality (quality of sound)
Acoustically, these prosodic variables correspond closely to:
fundamental frequency (measured in hertz, or cycles per second) duration (measured in time units such as milliseconds or seconds) intensity, or sound pressure level (measured in decibels) spectral characteristics (distribution of energy at different parts of the audible frequency range)
Different combinations of these variables are exploited in the linguistic functions of intonation and stress, as well as other prosodic features such as rhythm and tempo. Additional prosodic variables have been studied, including voice quality and pausing. The behavior of the prosodic variables can be studied either as contours across the prosodic unit or by the behavior of boundaries.
Phonology Prosodic features are suprasegmental, since they are properties of units of speech that are defined over groups of sounds rather than single segments. When talking about prosodic features, it is important to distinguish between the personal characteristics that belong to an individual's voice (for example, their habitual pitch range, intonation patterns, etc.) and the independently variable prosodic features that are used contrastively to communicate meaning (for example, the use of changes in pitch to indicate the difference between statements and questions). Personal characteristics that belong to an individual are not linguistically significant while prosodic features are. Prosody has been found across all languages and is described to be a natural component of language. The defining features of prosody that display the nuanced emotions of an individual differ across languages and cultures.
Intonation
Some writers (e.g., O'Connor and Arnold) have described intonation entirely in terms of pitch, while others (e.g., Crystal) propose that "intonation" is a combination of several prosodic variables. English intonation is often said to be based on three aspects:
The division of speech into units The highlighting of particular words and syllables The choice of pitch movement (e.g., fall or rise)
The choice of pitch movement and the highlighting of particular words to create different intonation patterns can be seen in the following English conversation:
"That's a cat?" "Yup. That's a cat." "A ? I thought it was a mountain lion!"
The exchange above is an example of using intonation to highlight particular words and to employ rising and falling of pitch to change meaning. If read out loud, the pitch of the voice moves in different directions on the word "cat." In the first line, pitch goes up, indicating a question. In the second line, pitch falls, indicating a statementa confirmation of the first line in this case. Finally, in the third line, a complicated fall-rise pattern indicates incredulity. Each pitch/intonation pattern communicates a different meaning.
An additional pitch-related variation is pitch range; speakers are capable of speaking with a wide range of pitch (this is usually associated with excitement), while at other times with a narrow range. English makes use of changes in key; shifting one's intonation into the higher or lower part of one's pitch range is believed to be meaningful in certain contexts.
Stress Stress functions as the means of making a syllable prominent. Stress may be studied in relation to individual words (named "word stress" or lexical stress) or in relation to larger units of speech (traditionally referred to as "sentence stress" but more appropriately named "prosodic stress"). Stressed syllables are made prominent by several variables. Stress is typically associated with the following:
pitch prominence (a pitch level that is different from that of neighboring syllables, or a pitch movement) increased length (duration) increased loudness (dynamics) differences in timbre: in English and some other languages, stress is associated with aspects of vowel quality (whose acoustic correlate is the formant frequencies or spectrum of the vowel). Unstressed vowels tend to be centralized relative to stressed vowels, which are normally more peripheral in quality
Some of these cues are more powerful or prominent than others. Alan Cruttenden, for example, writes "Perceptual experiments have clearly shown that, in English at any rate, the three features (pitch, length and loudness) form a scale of importance in bringing syllables into prominence, pitch being the most efficacious, and loudness the least so".
When pitch prominence is the major factor, the resulting prominence is often called accent rather than stress.
There is considerable variation from language to language concerning the role of stress in identifying words or in interpreting grammar and syntax.
Tempo
Rhythm
Although rhythm is not a prosodic variable in the way that pitch or loudness are, it is usual to treat a language's characteristic rhythm as a part of its prosodic phonology. It has often been asserted that languages exhibit regularity in the timing of successive units of speech, a regularity referred to as isochrony, and that every language may be assigned one of three rhythmical types: stress-timed (where the durations of the intervals between stressed syllables is relatively constant), syllable-timed (where the durations of successive syllables are relatively constant) and mora-timed (where the durations of successive morae are relatively constant). As explained in the isochrony article, this claim has not been supported by scientific evidence.
Pause
Voiced or unvoiced, the pause is a form of interruption to articulatory continuity such as an open or terminal juncture. Conversation analysis commonly notes pause length. Distinguishing auditory hesitation from silent pauses is one challenge. Contrasting junctures within and without word chunks can aid in identifying pauses.
There are a variety of "filled" pause types. Formulaic language pause fillers include "Like", "Er" and "Um", and paralinguistic expressive respiratory pauses include the sigh and gasp.
Although related to breathing, pauses may contain contrastive linguistic content, as in the periods between individual words in English advertising voice-over copy sometimes placed to denote high information content, e.g. "Quality. Service. Value".
Chunking
Pausing or its lack contributes to the perception of word groups, or chunks. Examples include the phrase, phraseme, constituent or interjection. Chunks commonly highlight lexical items or fixed expression idioms. Chunking prosody is present on any complete utterance and may correspond to a syntactic category, but not necessarily. The well-known English chunk "Know what I mean?" in common usage sounds like a single word ("No-wada-MEEN?") due to blurring or rushing the articulation of adjacent word syllables, thereby changing the potential open junctures between words into closed junctures.
Functions Prosody has had a number of perceptually significant functions in English and other languages, contributing to the recognition and comprehension of speech.
Grammar It is believed that prosody assists listeners in parsing continuous speech and in the recognition of words, providing cues to syntactic structure, grammatical boundaries and sentence type. Boundaries between intonation units are often associated with grammatical or syntactic boundaries; these are marked by such prosodic features as pauses and slowing of tempo, as well as "pitch reset" where the speaker's pitch level returns to the level typical of the onset of a new intonation unit. In this way potential ambiguities may be resolved. For example, the sentence "They invited Bob and Bill and Al got rejected" is ambiguous when written, although addition of a written comma after either "Bob" or "Bill" will remove the sentence's ambiguity. But when the sentence is read aloud, prosodic cues like pauses (dividing the sentence into chunks) and changes in intonation will reduce or remove the ambiguity. Moving the intonational boundary in cases such as the above example will tend to change the interpretation of the sentence. This result has been found in studies performed in both English and Bulgarian. Research in English word recognition has demonstrated an important role for prosody.
Focus Intonation and stress work together to highlight important words or syllables for contrast and focus. This is sometimes referred to as the accentual function of prosody. A well-known example is the ambiguous sentence "I never said she stole my money", where there are seven meaning changes depending on which of the seven words is vocally highlighted.
Discourse and pragmatic functions Prosody helps convey many other pragmatic functions, including expressing attitudes (approval, uncertainty, dissatisfaction, and so on), flagging turn-taking intentions (to hold the floor, to yield the turn, to invite a backchannel like uh-huh, and so on), and marking topic structure (starting a new topic, closing a topic, interpolating a parenthetical remark, and so on), among others. For example, David Brazil and his associates studied how intonation can indicate whether information is new or already established; whether a speaker is dominant or not in a conversation; and when a speaker is inviting the listener to make a contribution to the conversation.
Emotion
Prosody is also important in signalling emotions and attitudes. When this is involuntary (as when the voice is affected by anxiety or fear), the prosodic information is not linguistically significant. However, when the speaker varies their speech intentionally, for example to indicate sarcasm, this usually involves the use of prosodic features. The most useful prosodic feature in detecting sarcasm is a reduction in the mean fundamental frequency relative to other speech for humor, neutrality, or sincerity. While prosodic cues are important in indicating sarcasm, context clues and shared knowledge are also important.