What aspect of speech varies in amplitude, duration, and frequency to convey information or emotions?

Prosody encompasses the rhythm, stress, and intonation of speech, which plays a crucial role in conveying meaning and emotion. This aspect of speech varies in three key dimensions: amplitude (loudness), duration (length of sounds), and frequency (pitch). By manipulating these elements, speakers can express different emotions, emphasize certain words, or indicate questions versus statements. For instance, the rise in pitch at the end of a sentence can signal a question, while a more monotonous tone might indicate boredom or a lack of interest. Thus, prosody is fundamental in adding a layer of meaning and emotional context to spoken language, beyond the mere words used.