Syntactic rules in avian vocal sequences as a window into the evolution of compositionality
2019
Suzuki, Toshitaka N. | Griesser, Michael | Wheatcroft, David
Understanding the origins and evolution of language remains a deep challenge, because its complexity and expressive power are unparalleled in the animal world. One of the key features of language is that the meaning of an expression is determined both by the meanings of its constituent parts and the syntactic rules used to combine them; known as the principle of compositionality. Although compositionality has been considered unique to language, recent field studies suggest that compositionality may have also evolved in vocal combinations in nonhuman animals. Here, we discuss how compositionality can be explored in animal communication systems and review recent evidence that birds use an ordering rule to generate compositional expressions composed of meaningful calls. Also, we suggest that birdsongs, particularly when incorporating calls, may represent unrecognized examples of compositionality in animal communication. Finally, we outline future research directions to uncover the development, neural mechanisms and evolution of compositionality.
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