Simulating the Referential Properties of Dutch, German, and English Root Infinitives in MOSAIC

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Abstract
Children learning many languages go through an optional infinitive (OI) stage in which they produce nonfinite verb forms in contexts in which a finite verb form is required (e.g., “That go there” instead of “That goes there”). MOSAIC (Model of Syntax Acquisition in Children) is a computational model of language learning that successfully simulates the developmental patterning of the OI phenomenon in English, Dutch, German, and Spanish ( Freudenthal, Pine, Aguado-Orea, & Gobet, 2007 Freudenthal, D. , Pine, J. M. , Aguado-Orea, J. and Gobet, F. 2007. Modelling the developmental patterning of finiteness marking in English, Dutch, German and Spanish using MOSAIC. Cognitive Science, 31: 311–341. [PubMed], [Web of Science ®] [Google Scholar] ). In the present study, MOSAIC is applied to the simulation of certain subtle but theoretically important phenomena in the cross-linguistic patterning of the OI phenomenon that are typically assumed to require a more complex formal analysis. MOSAIC is shown to successfully simulate (a) the Modal Reference Effect, the finding that Dutch and German children tend to use root infinitives (RIs) in modal contexts; (b) the Eventivity Constraint, the finding that Dutch and German RIs refer predominantly to actions rather than static situations; and (c) the absence or reduced size of these effects in English. These results provide strong support for input-driven explanations of the Modal Reference Effect as well as MOSAIC's mechanism for producing RIs, and the wider claim that it is possible to explain key aspects of children's early multiword speech in terms of the interaction between a resource-limited distributional learning mechanism and the surface properties of the language to which children are exposed.

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