Priming Center-Embedded Object and Extraposed Subject Relative Clauses in Persian Language Production: Searching for Persistence of Hierarchical Configuration.

Substantial evidence suggests that priming can co-occur at different syntactic and nonsyntactic levels. In this study, we further explore two loci of priming concerned with hierarchical configuration and thematic information using relative clause (RC) constructions. In a comprehension-to-production task, Persian speakers (42 adults and 42 children) described pictures after hearing extraposed subject or center-embedded object RCs containing the same or different verbs. We ask whether priming the object RC mitigates the computational cost of center-embedding and thus increases the subsequent production of this infrequent structure. We also measured persistence effects associated with the assignment of emphasis to thematic roles, examining whether a particular portrayal of an event is captured and reproduced (e.g., foregrounding the patient). Although this study could not establish any significant priming effects in the production of the center-embedded object RC, we observed that adults used this construction more in the same verbs condition. The overall results instead revealed strong evidence for thematic emphasis persistence, such that patient-emphasis object relatives further elicited functionally equivalent RC constructions. We discuss priming of hierarchical configuration as a candidate locus and explain the activation of functional information from the speaker's perspective.