Is structural priming a possible mechanism of language change in heritage language grammars? Some evidence from accusative clitic doubling in Spanish

The language of heritage speakers is characterized by variability and structural innovations compared to the baseline grammar of first-generation immigrants. Although many factors contribute to these differences, this study considers structural priming with structures that do not exist in the majority language as a potential mechanism for language change. The linguistic focus is accusative clitic doubling, which exists in some Spanish varieties, but which is unacceptable in others. Our research examined how flexible heritage speakers' grammars are compared to baseline speakers, and to what extent heritage speakers adopt structures attested in the diachronic development and in other varieties of their heritage language. In two studies, we tested the acceptability of accusative clitic doubling and primed accusative clitic doubling in oral production. Results showed that heritage speakers of Spanish are somewhat accepting of innovative structures and more sensitive to structural priming compared to baseline speakers, who are generally not.