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study showing that students who were given access to the Internet during class and were encouraged to use it during lectures did not process what the speaker said as well as students who did not have Internet access. When students were tested after class lectures, those who did not have Internet access performed better than those who did.

These and other studies show that multi-tasking "prevents people from getting a deeper understanding of information," Greenfield said.

Children are clearly spending more time on the Internet. In a study of 2,032 representative 8- to 18-year-olds, the Kaiser Family Foundation found that nearly half used the Internet on a typical day in 2004, up from just under a quarter in 1999. The average time these children spent online on a typical day rose to one hour and 41 minutes in 2004, from 46 minutes in 1999.

“Learning is not to be found on a printout,” David McCullough, the Pulitzer Prize-winning biographer, said in a commencement address at Boston College in May. “It’s not on call at the touch of the finger. Learning is acquired mainly from books, and most readily from great books.”

Critics of reading on the Internet say they see no evidence that increased Web activity improves reading achievement. “What we are losing in this country and presumably around the world is the sustained, focused, linear attention developed by reading,” said Mr. Gioia of the N.E.A. “I would believe people who tell me that the Internet develops reading if I did not see such a universal decline in reading ability and reading comprehension on virtually all tests.”

Literacy specialists are just beginning to investigate how reading on the Internet affects reading skills. A recent study of more than 700 low-income, mostly Hispanic and black sixth through 10th graders in Detroit found that those students read more on the Web than in any other medium, though they also read books. The only kind of reading that related to higher academic performance was frequent novel reading, which predicted better grades in English class and higher overall grade point averages.

Elizabeth Birr Moje, a professor at the University of Michigan who led the study, said novel reading was similar to what schools demand already. But on the Internet, she said, students are developing new reading skills that are neither taught nor evaluated in school.

“Reading a book, and taking the time to ruminate and make inferences and engage the imaginational processing, is more cognitively enriching, without doubt, than the short little bits that you might get if you’re into the 30-second digital mode,” said Ken Pugh, a cognitive neuroscientist at Yale who has studied brain scans of children reading.

In one study, Donald J. Leu, who researches literacy and technology at the University of Connecticut, asked 48 students to look at a spoof Web site (http://zapatopi.net/treeoctopus/) about a mythical species known as the “Pacific Northwest tree octopus.” Nearly 90 percent of them missed the joke and deemed the site a reliable source.