CFG Research Papers - Academia.edu (original) (raw)

Humans regularly produce new utterances that are understood by other members of the same language community1. Linguistic
theories account for this ability through the use of syntactic
rules (or generative grammars) that describe the acceptable
structure of utterances2. The recursive, hierarchical embedding
of language units (for example, words or phrases within shorter
sentences) that is part of the ability to construct new utterances
minimally requires a ‘context-free’ grammar2,3 that is more complex than the ‘finite-state’ grammars thought sufficient to specify the structure of all non-human communication signals. Recent hypotheses make the central claim that the capacity for syntactic recursion forms the computational core of a uniquely human language faculty4,5.Here we show that European starlings (Sturnus vulgaris) accurately recognize acoustic patterns defined by a recursive, self-embedding, context-free grammar. They are also able to classify new patterns defined by the grammar and reliably exclude agrammatical patterns. Thus, the capacity to classify sequences from recursive, centre-embedded grammars is not uniquely human. This finding opens a new range of complex syntactic processing mechanisms to physiological investigation.