An English-speaking boy produced 121 lexical innovations and 98 over-regularizations between 30 and 56 months and during a subsequent period, 63 through 71 months. Both phenomena exhibited an increase and decrease in production, reaching a peak at 3;4. The derivational strategies used to produce lexical innovations demonstrated developmental change from simple to complex strategy use, but the inflectional strategies of over-regularizations did not. Results are discussed in the light of Clark's principles as well as Rule-Use and Connectionist explanations of children's morphological development.
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