Syntactic change in contact is generally explained as a result of cognitive, structural/typological, or sociolinguistic factors. However, the relative weight of these factors in shaping the outputs of contact is yet to be assessed. In this paper, we propose a microcontact approach to the study of change in contact, focusing on microsyntactic points of variation across multiple language pairs that are structurally very close. We show that this approach makes it possible to more accurately identify some of the factors that are involved in change. By considering three case studies centered on the syntax of subjects, objects, and indexicals, we show that the outputs of syntactic change in microcontact diverge from what is expected under otherwise solid generalizations (avoidance of indeterminacy, avoidance of silence, the Interface Hypothesis, a tendency towards simplification, and the general stability of the indexical domain) regarding change in contact. Microcontact offers a finer-grained point of observation, allowing us to go beyond broader typological assumptions and to focus on the link between structure and cognition. The results of our case studies demonstrate that the outputs of change in contact are an interplay between cognitive and structural factors (see also Muysken 2013 for additional processing considerations), and that the micro-variational dimension is crucial in drawing a precise picture of heritage language syntax.

The aim of this contribution is to discuss three possible theoretical interpretations of grammaticalised structures in present-day Italo-Romance varieties. In particular, we discuss and analyse three diachronic case studies in relation to the generative view of grammaticalisation. The first case-study revolves around the expression of future tense and modality. This is discussed in the light of the assumption according to which grammaticalised elements result from merging elements in higher positions than their original merge positions within the lexical domain, giving rise to the upward directionality of the grammaticalisation process within the clause (Roberts, Ian G. and Anna Roussou, 2003, Syntactic change: A minimalist approach to grammaticalization. Cambridge: Cambridge University Press). The second case study challenges this view, by discussing irrealis complementisers as a case of a downward pathway of grammaticalization at the CP level. For our third case study, namely the development of (discontinuous) demonstrative structures from Latin to Romance, the rich Italo-Romance empirical evidence is analysed through the lens of a parametric account (Longobardi, Giuseppe, Cristina Guardiano, Giuseppina Silvestri, Alessio Boattini, and Andrea Ceolin, 2013, Toward a syntactic phylogeny of modern Indo-European languages, Journal of Historical Linguistics 3(1), 122-152), in order to capture the role of the relevant semantic and syntactic features within the fine-grained architecture of the DP. It will be observed that the diachronic development of some functional categories in (Italo-)Romance results from cyclic pathways of grammaticalisation, as the same category might cyclically change from more synthetic to more analytic, and vice-versa. Moreover, it will also be shown how the two theoretical approaches adopted, i.e. the cartographic model (adopted in Roberts, Ian G. and Anna Roussou, 2003. Syntactic change: A minimalist approach to grammaticalization, Cambridge: Cambridge University Press), and the parametric accounts (Longobardi, Giuseppe, Cristina Guardiano, Giuseppina Silvestri, Alessio Boattini and Andrea Ceolin, 2013, Toward a syntactic phylogeny of modern Indo-European languages, Journal of Historical Linguistics 3(1), 122-152), are able to provide a principled explanation of the structural correlates of grammaticalisation at the sentential, clausal and nominal level of investigation.

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