The origins of grammaticalization in the verbalization of experience

The origins of language change, particularly grammatical change, appear to be unobservable. But the first step in language change, innovation, can be observed in the production of synchronic variation in sound change. The same can be done for morphosyntactic change such as grammaticalization by comparing alternative verbalizations of the same experience in a controlled situation. Examples of innovation in lexical semantic change and grammaticalization are examined using the twenty parallel English narratives of the Pear Stories. Morphosyntactic variation is pervasive in the Pear Stories narratives and the alternative verbalizations show that morphosyntactic change is drawn from a pool of synchronic variation. These results disconfirm the traditional theory of morphosyntactic change, in which innovation is rare and special mechanisms are required to produce it. Instead, grammaticalization, and language change in general, originates in the variation inherent in the verbalization of experience.