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This paper presents a specific take on the relationship between the global and the local in language. In particular, it draws a distinction between the cognitive and the communal plane of language representation and attempts to model the relationship between the two using complexity theory. To operationalise this relationship and examine it with corpus linguistic methods, it proposes a concept of a cognitive corpus, setting it against the more usual idea of a corpus as representing the language of a certain community of speakers. As a case study, the paper compares the properties of chunking at the cognitive and communal planes. The study shows that (1) chunks at the cognitive plane seem to be more fixed than at the communal, (2) their patterning at the communal plane can be seen as emergent from the patterning observable in individual languages, but that (3) there is also similarity in the shape of the patterning across the two planes. These findings suggest that although the processes leading to multi-word unit patterning are different at each of the planes, the similarity in the shape the patterning takes might be regarded as an indication of the fractal structure of language which is a common property of complex adaptive systems. For example, Zipf's law, which is able to model the patterning at each of the planes, can be seen as one of the symptoms of such structure. Since the cognitive and the communal planes of language are in constant interaction with each other, such conceptualisation suggests intriguing implications for ongoing change in English and the role second language users might play in it. [A fractal is] a rough or fragmented geometric shape that can be split into parts, each of which is (at least approximately) a reduced-size copy of the whole.

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