The Tale of Two Lexicons: Decomposing Complexity across a Distributed Lexicon

Abstract The notion of complexity is evasive and often left to intuition, yet it is often invoked when studying heritage language grammars. In this article, we propose a first pass at decomposing the notion of complexity into smaller components in a formal grammatical model. In particular, we argue that a distributed model of the lexicon (i.e., one that assumes that principles that generate both words and phrases are one and the same) allows us to identify three components: syntactic features, the hierarchical organization of features, and the mapping between syntactic features and their exponents. Based on grammatical gender in different language pairs, in particular the heritage language American Norwegian (AmNo), we illustrate how this distributed model can account for developments in heritage language grammars whereby the grammatical gender system is considered to have become less complex. More generally, the article demonstrates that a distributed architecture is better suited empirically and theoretically as a heuristic to understand complexity effects in heritage grammars and beyond.