Excerpt from the NYT review:
For Carr, the analogy is obvious: The modern mind is like the fictional computer. "I can feel it too," he writes. "Over the last few years, I've had an uncomfortable sense that someone, or something, has been tinkering with my brain, remapping the neural circuitry, reprogramming the memory." While HAL was silenced by its human users, Carr argues that we are sabotaging ourselves, trading away the seriousness of sustained attention for the frantic superficiality of the Internet. As Carr first observed in his much discussed 2008 article in The Atlantic, "Is Google Making Us Stupid?," the mere existence of the online world has made it much harder (at least for him) to engage with difficult texts and complex ideas. "Once I was a scuba diver in a sea of words," Carr writes, with typical eloquence. "Now I zip along the surface like a guy on a Jet Ski."
This is a measured manifesto. Even as Carr bemoans his vanishing attention span, he's careful to note the usefulness of the Internet, which provides us with access to a near infinitude of information. We might be consigned to the intellectual shallows, but these shallows are as wide as a vast ocean.
Nevertheless, Carr insists that the negative side effects of the Internet outweigh its efficiencies. Consider, for instance, the search engine, which Carr believes has fragmented our knowledge. "We don't see the forest when we search the Web," he writes. "We don't even see the trees. We see twigs and leaves." One of Carr's most convincing pieces of evidence comes from a 2008 study that reviewed 34 million academic articles published between 1945 and 2005. While the digitization of journals made it far easier to find this information, it also coincided with a narrowing of citations, with scholars citing fewer previous articles and focusing more heavily on recent publications. Why is it that in a world in which everything is available we all end up reading the same thing?