TY - JOUR TI - Morphological blind-alley developments as a theoretical challenge to both usage-based and nativist acquisition models AU - Dressler, W.U. AU - Christofidou, A. AU - Gagarina, N. AU - Korecky-Kröll, K. AU - Kilani-Schoch, M. JO - Italian Journal of Linguistics PY - 2020 VL - 31 TODO - 2 SP - 107-140 PB - Pacini Editore S.p.A. SN - null TODO - 10.26346/1120-2726-138 TODO - null TODO - In this paper we want to challenge two leading acquisitionist approaches or model types, namely usage-based and nativist models, and argue in favour of a constructivist model of autopoiesis. Our area of investigation is morphology in its major components inflection, derivation and compounding. The data are longitudinal production data of everyday mother-child interactions. First, we formulate a general challenge to usage-based approaches. We then sketch our general account in terms of Natural Morphology and claim that this account cannot be transformed into, or be substituted by, an existing nativist account based on published claims about Universal Grammar. We end by discussing in detail the nine phenomena observed in early Greek, German, French and Russian acquisition data and give an account in terms of self-organisation and Natural Morphology. © 2019 Pacini Editore S.p.A.. All rights reserved. ER -