This paper outlines a proposal to cover four very early stages for the acquisition of negation systems in natural languages. It emphasizes the formal linguistic devices as the major variables that determine the various language-specific developmental sequences. (CHK)

In one experiment, children from 5 to 10 years of age played with puppets and responded to questions concerning the acquisition of one particular linguistic structure by children; in another series of experiments, both children and adults responded to questions regarding nonsense words in differentiating contexts--the focus of the discussion…

This work is an English translation of the author's classic "Kindersprache, Aphasie und allgemeine Lautgesetze," first published in 1941. It is considered the most representative and comprehensive of the author's phonological writings, dealing not only with phonological typology but related problems of language acquisition and phonemic regression…