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A spoken language is more than just words and sounds. Speakers use changes in pitch and rhythm, known as prosody, to provide emphasis, show emotion, and otherwise add meaning to what they say. But a language does not need to be spoken to have prosody: sign languages, such as American Sign Language (ASL), use movements, pauses and facial expressions to achieve the same goals. In a study appearing in the September 2015 issue of Language, three linguists look at intonation (a key part of prosody) in ASL and find that native ASL signers learn intonation in much the same way that users of spoken languages do. Children learning ASL acquired prosodic features in three stages of "appearance, reorganization, and mastery": accurately replicating their use in simpler contexts, attempting unsuccessfully at first to use them in more challenging contexts, then using them accurately in all contexts as they fully learn the rules of prosody. Previous research has shown that native learners of spoken languages acquire intonation following a similar pattern.

scholarly

A linguist who began to train her border collie for sheepdog competitions using a dog whistle realized that the commands reminded her of language. The article goes on to detail communication between dogs and people, and how dog's cognition and understanding goes past following basic commands. For example, Chaser, the border collie, was able to fast map and learn things through reference cues - which goes much farther past simply understanding commands. It turns out, shepherds use only a few whistle commands with their sheepdogs, but the whistles change meaning based on situation, pitch, speed, etc, and provide information to the dog, similar to prosody, a key part of human language.

This was a study looking at the use of elderspeak in a referential communication task. The study was used to determine if young adults paired with older adults, who stimulated dementia or acted normally, would change their fluency, prosody, grammatical complexity, semantic content, or discourse.