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Purpose:  Deficits in the production of novel words, such as in nonword repetition tasks, are one of the early hallmarks of developmental language disorder (DLD). In children with DLD, the production of novel nonwords is characterised by speech sound inaccuracy. The focus of the present study is on the stable organisation of phonological sequences. Specifically, we aimed to identify the persistence of deficits in accuracy and in variability in sound sequencing in novel word production from pre-school to the early school years. Method:  Children with and without DLD produced a set of six nonwords 12 times each, initially collected when children were 4- to 5-years old. Children repeated this task over the course of two years. Analyses included phonetic accuracy as well as network science indices of sound sequence organisation. Result:  Children with DLD were less accurate than their peers with typical language at each timepoint, and their productions were markedly variable, as revealed by network science metrics; these children never converged with their peers with typical language. Conclusion:  The findings suggest a unique deficit in phonological sequence production that persists beyond the pre-school years. These results offer new theoretical and clinical insights into mechanisms that underlie deficits in novel word form learning.

A longitudinal study of the phonological organisation of novel word forms in children with developmental language disorder