For the duration of the study, the subjects' use of the Internet was recorded. For the purposes of this study, depression and loneliness were measured independently, and each subject was rated on a subjective scale. In measuring depression, the responses were plotted on a scale of 0 to 3, with 0 being the least depressed and 3 being the most depressed. Loneliness was plotted on a scale of 1 to 5.

By the end of the study, the researchers found that one hour a week on the Internet led, on average, to an increase of .03, or 1 percent, on the depression scale, a loss of 2.7 members of the subject's social circle, which averaged 66 people, and an increase of .02, or four-tenths of 1 percent, on the loneliness scale.

The subjects exhibited wide variations in all three measured effects, and while the net effects were not large, they were statistically significant in demonstrating deterioration of social and psychological life, Kraut said.

Based on these data, the researchers hypothesize that relationships maintained over long distances without face-to-face contact ultimately do not provide the kind of support and reciprocity that typically contribute to a sense of psychological security and happiness, like being available to baby-sit in a pinch for a friend, or to grab a cup of coffee.

"Our hypothesis is there are more cases where you're building shallow relationships, leading to an overall decline in feeling of connection to other people," Kraut said.

The study tracked the behavior of 169 participants in the Pittsburgh area who were selected from four schools and community groups. Half the group was measured through two years of Internet use, and the other half for one year. The findings will be published this week by The American Psychologist, the peer-reviewed monthly journal of the American Psychological Association.

Because the study participants were not randomly selected, it is unclear how the findings apply to the general population. It is also conceivable that some unmeasured factor caused simultaneous increases in use of the Internet and decline in normal levels of social involvement. Moreover, the effect of Internet use varied depending on an individual's life patterns and type of use. Researchers said that people who were isolated because of their geography or work shifts might have benefited socially from Internet use.

Even so, several social scientists familiar with the study vouched for its credibility and predicted that the findings would probably touch off a national debate over how public policy on the Internet should evolve and how the technology itself might be shaped to yield more beneficial effects.

"They did an extremely careful scientific study, and it's not a result that's easily ignored," said Tora Bikson, a senior scientist at Rand, the research institution. Based in part on previous studies that focused on how local communities like Santa Monica, Calif., used computer networks to enhance civic participation, Rand has recommended that the federal government provide e-mail access to all Americans.

"It's not clear what the underlying psychological explanation is," Ms. Bikson said of the study. "Is it because people give up day-to-day contact and then find themselves depressed? Or are they exposed to the broader world of Internet and then wonder, 'What am I doing here in Pittsburgh?' Maybe your comparison standard changes. I'd like to see this replicated on a larger scale. Then I'd really worry."

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