Christine Riley, a psychologist at Intel Corp., the giant chip manufacturer that was among the sponsors of the study, said she was surprised by the results but did not consider the research definitive.

"For us, the point is there was really no information on this before," Ms. Riley said. "But it's important to remember this is not about the technology, per se; it's about how it is used. It really points to the need for considering social factors in terms of how you design applications and services for technology."

The Carnegie Mellon team -- which included Sara Kiesler, a social psychologist who helped pioneer the study of human interaction over computer networks; Tridas Mukophadhyay, a professor at the graduate business school who has examined computer mediated communication in the workplace; and William Scherlis, a research scientist in computer science -- stressed that the negative effects of Internet use that they found were not inevitable.

For example, the main focus of Internet use in schools has been gathering information and getting in touch with people from far-away places. But the research suggests that maintaining social ties with people in close physical proximity could be more psychologically healthy.

"More intense development and deployment of services that support pre-existing communities and strong relationships should be encouraged," the researchers write in their forthcoming article. "Government efforts to wire the nation's schools, for example, should consider online homework sessions for students rather than just online reference works."

At a time when Internet use is expanding rapidly -- nearly 70 million adult Americans are on line, according to Nielsen Media Research -- social critics say the technology could exacerbate the fragmentation of U.S. society or help to fuse it, depending on how it is used.

"There are two things the Internet can turn out to be, and we don't know yet which it's going to be," said Robert Putnam, a political scientist at Harvard University whose forthcoming book, "Bowling Alone," which is to be published next year by Simon & Schuster, chronicles the alienation of Americans from each other since the 1960s. "The fact that I'm able to communicate daily with my collaborators in Germany and Japan makes me more efficient, but there are a lot of things it can't do, like bring me chicken soup."

Putnam added, "The question is how can you push computer mediated communication in a direction that would make it more community friendly."

Perhaps paradoxically, several participants in the Internet study expressed surprise when they were informed of the study's conclusions by a reporter.

"For me it's been the opposite of depression; it's been a way of being connected," said Rabbi Alvin Berkun, who used the Internet for a few hours a week to read The Jerusalem Post and communicate with other rabbis across the country.

But Berkun said his wife did not share his enthusiasm for the medium. "She does sometimes resent when I go and hook up," he said, adding after a pause, "I guess I am away from where my family is while I'm on the computer." Another possibility is that the natural human preference for face-to-face communication may provide a self-correcting mechanism to the technology that tries to cross it.

The rabbi's daughter, Rebecca, 17, said she had spent a fair amount of time in teen-age chat rooms at the beginning of the survey in 1995.

"I can see how people would get depressed," Ms. Berkun said. "When we first got it, I would be on for an hour a day or more. But I found it was the same type of people, the same type of things being said. It got kind of old."

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