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The nature of the input: Tracing INFL through the Dual Mechanism Model of Language Development

3. Abstract B&R show how, by delimiting (in some way) the child’s ability to build paradigmatic formations (a product of the Computational System (CS) of the Language Faculty) 1 , we can account for the obviously incremental nature of child language development—viz., the universally attested accounts of the absence of Functional categories/Inflectional features observed in early stages of child speech. By extension, and congruent with these insights, we propose an alternative account suggesting that the Dual Mechanism Model [7], though originally slated as an adult morphological process, can be reinterpreted as a more precise and biologically determined mechanism which can guide the CS in such delimited ways, consistent with the attested the noninflectional stage-1 found in the study. It is natural that the focus of inquiry here should be held on regular INFL-affix formations, since they constitute the core elements open to a DMM analysis. While the models herein are biased towards regular formations, irregular formations are similarly taken in the model to be products of movement and so are equally open to much of the same analyses presented in the paper. Though, there could be an observable disparity in the early data amongst delayed onsets of (i) (bound) INFL-morphemes relating to (non-root) features and early onsets of (ii) (free) Functional items related to (word) categories. In fact this shows up in my data with the early appearance of Determiners in the otherwise Non-INFL stage. We