Not very many years ago, it was common for language researchers and
theorists to argue that language development was somehow special and
separate from other aspects of development. It was a period when the "1
ittle 1 inguist" view of language development was common, and much
discussion was devoted to develop- mental "linguistic universals," in
contrast to more broadly defined cognitive universals. It seemed to me
at the time (and still does) that such views reflected more their
promulgators' ignorance of those aspects of cognitive development most
likely to provide illuminating parallels with language development than
they did the true developmental state of affairs. Coming from a
neo-Piagetian frame of reference, it seemed to me that there were
striking parallels be- tween the development of children's language
comprehension abilities and the cognitive developmental changes
occurring contemporaneously, largely during the period Piaget
characterized as the preoperational stage. And, though more difficult to
see even now, there appeared also to be developmentally earlier
parallels during the sensory-motor stage.