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“It may seem counterintuitive, but it is not quite as simple as saying sentences evolved before grunts,” Collier explained. “Animal calls or grunts most probably existed before ‘sentences.’ Most of these calls do not have meaning in the way that human words have meaning. A few have what we call functional reference, where they seem to denote an external object or event, such as a leopard for example. However, these calls cannot be decomposed into smaller sounds. They come as a single unit, unlike our words that are made up of several sounds that are reused in many different words. This is why we argue that there are no known examples of phonology in animal communication. On the other hand, as discussed in our paper, several species seem to combine these referential calls together to obtain new meanings in a similar way to very simple sentences in human language, which is why we argue that they may have a form of rudimentary syntax.
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Further evidence in support of the idea that syntax evolved before phonology in human language comes from analyzing a variety of human languages themselves, including sign languages. As far as linguists know, all human languages have syntax, but not all have phonology. The Al-Sayyid Bedouin Sign Language (ABSL) used by a small society in the Negev region of Israel is an emerging language that has been around for less than 75 years. Interestingly, it does not have phonology. For the ABSL, this means that a single object can be represented by a variety of hand shapes. However, the ABSL still has syntax and grammatical regularity, as demonstrated by the existence of rules for combining signs. Perhaps the presence of syntax but not phonology suggests that syntax originates first in the evolution of a young language, and perhaps also that it is simpler than phonology.
When looking at this hypothesis more closely, many aspects of it make sense. From a cognitive perspective, syntax may be simpler to process than phonology because it is easier to remember a few general rules than many phonemes. Having syntax allows speakers to express many concepts with only a few words. As language develops further, and still more concepts need to be communicated, phonology emerges to provide a larger vocabulary. The evolution of phonology may also be strongly influenced by cultural, rather than biological, evolutionary processes. The researchers hope to further develop these ideas in the future. More.
Examining wordless human languages may provide more useful answers than studying chimp pan hoots or monkey pyows.
See also: Why human language is hard to address in a mechanistic way
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