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Research on how children respond to media and on the nature of media effects still is most extensive with regard to the effects of television viewing on children's development. There rarely is one universal effect of media use, but specific aspects of such use may predict positive or negative outcomes in at least some children and teenagers. Recent surveys of time spent with various media suggest that television remains the dominant medium, beginning very early in childhood and extending through adolescence. Total media consumption and total television viewing by children and youth have changed little over the last several years, suggesting a source of stability in effects on development.

At the same time, the pace of change in media availability, in the functions of media, and in the portability of media far outstrips that of research into media effects. Patterns of media consumption reflect increasing specialization, as children and teenagers show more frequent use of cable channels and selectively recorded programs. The increased presence of media in children's bedrooms, greater storage capability of media devices, and extensive use of wireless technology and cellular telephone functions have provided children and teenagers with greater access to media; this access has been accompanied by a sharp increase in media multitasking. Despite numerous studies of the effects of television on children's development, what we know about media effects in general and effects of television in particular must be viewed as subject to change as technologies and the power and functions of media in children's lives continue to evolve.

Effects on Cognitive Development, Education, and Achievement

Concerns about television's potential harm to children's thinking and school achievement and hopes for its potential educational benefits have existed virtually since the medium's introduction. There are several bases for worries about risks to cognitive development and education. One hypothesis is that extensive early exposure to electronic media may affect brain development in infants and toddlers, leading to adverse effects on cognitive development. Although some studies report negative associations between the total amount of very early exposure to television and measures of language and attentional abilities, effects of some content can be positive, and no specific evidence of effects on early brain development has been produced.

A second explanation for potential negative effects is founded on a distinction between foreground and background television. The former refers to programming produced for young children and often selected by them or their parents for intentional viewing, whereas the latter consists of programming produced for a general audience, which serves as a backdrop for children's other activities. Background television may constitute the bulk of television exposure among infants and toddlers, a situation even more the case before the advent of television programs (e.g., Teletubbies) and videos (e.g., Baby Einstein) designed specifically for this youngest age group. Whereas the question remains open as to whether foreground television can be used productively with a very young audience, there is growing evidence that background television is disruptive to toddlers' play behavior and social interaction and that an early rearing environment characterized by more background noise is associated with poorer cognitive development. Television as a major component of background noise is a common phenomenon for very young children who live in households where television is left on most of the time, and according to a Kaiser Foundation study, this situation may exist in nearly half of U.S. households.

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