The Internet is an interruption system. It seizes our attention only to scramble it. There’s the problem of hypertext and the many different kinds of media coming at us simultaneously. Every time we shift our attention, the brain has to reorient itself, further taxing our mental resources. Many studies have shown that switching between just two tasks can add substantially to our cognitive load, impeding our thinking and increasing the likelihood that we’ll overlook or misinterpret important information.
On the Internet, where we generally juggle several tasks, the switching costs pile ever higher. We willingly accept the loss of concentration and focus, the fragmentation of our attention, and the thinning of our thoughts in return for the wealth of compelling, or at least diverting, information we receive.