How does intonation communicate attitudes and social relationships in speech?

Intonation, defined as the melodic pattern of an utterance, plays a crucial role in communication by conveying expressive meaning and social nuance beyond the literal definition of words.12

While intonation often serves a grammatical function—such as distinguishing between a statement and a question through falling or rising pitch—it also functions paralinguistically to communicate attitudes and social information. Variations in pitch, independent of grammatical structure, allow speakers to express emotional states such as anger, surprise, or delight.12

Furthermore, the absolute values of pitch and other suprasegmental features, such as stress and length, provide listeners with cues regarding a speaker's identity, including their age and sex. By modulating these patterns, individuals signal their emotional reaction to a situation or establish the tone of a social interaction, such as turning a word into a command or a query. Ultimately, these melodic patterns contribute to the total meaning of an utterance, shaping how social relationships and personal attitudes are perceived in speech.23