Stating that the most pressing and puzzling scientific questions are questions about properties, not about change, the authors examine Piaget's and other theories of human development. Disputes the constructivist view that the initial cognitive state is one of emptiness, showing that from birth, humans react to certain stimuli in specific ways,…

Argues that evolution of the phonological systems of natural languages and the typology of distinctive features is based on perceptual discontinuities of the auditory system. It is suggested that neonates rely on these innate sensitivities for acquisition of sound systems and that some phonological variation in early child phonology results from…

The literature on the effects of congenital blindness on infants' development of motor functions and concepts of object permanence is reviewed. The article questions the idea that infants must first develop an object concept before sound clues alone will elicit reaching. Possible interventions to redress the effects of congenital blindness on…

It has been 20 years since Bever's (1982) and Strauss and Stavy's (1982) books on U-shaped functions in human development were published. The three target articles in this issue describe several old and new U-shaped functions and new theoretical explanations for their existence. In this article, the authors will comment on two aspects of U-shaped…

Discusses early detection of hearing impairment in Japan with particular reference to the system used in Tokushima Prefecture. Suggests that a required screening of all children at 18 months of age resulted in 2 developments: (1) all the hard-of-hearing children were identified; and (2) public health nurses became more alert to hearing impairment…

Gives an overview of the present school system in Japan, focusing on early intervention for hearing impairments, auditory compensation devices, and instruction in auditory training. Suggests that recent developments in hearing aid technology have resulted in substantial improvements in the identification and rehabilitation of hearing-impaired…

Presents an overview of hearing aid fitting procedures and auditory rehabilitation for hearing-impaired children in Japan. Reviews issues of audiological management in Japanese schools and discusses two kinds of simplified auditory tests. Finally, highlights several controversial issues surrounding different perspectives and methods of education…