Cal Newport writes:

When I published my book “Deep Work” 10 years ago, I argued that email and instant messages were degrading our ability to concentrate on hard mental tasks. I recommended putting aside long stretches of time for uninterrupted thinking and treating this cognitive activity like a skill that you can improve through practice. The term “deep work” quickly entered the vernacular, and I started to hear people and companies use it without even realizing its source.

But the problems I focused on in “Deep Work,” and in my writing since, have been getting steadily worse. In 2016 my main concern was helping people find enough free time for deep work. Today I think we’re rapidly losing the ability to think deeply at all, regardless of how much space we can find in our schedules for these efforts.

The data backs up this claim. Research from Gloria Mark, a professor of informatics at the University of California, Irvine, indicates that our attention spans are about one-third as long as they were in 2004, with the biggest drops happening around 2012. Long-running surveys reveal that the share of U.S. adults who struggle with basic reading or math has risen markedly over the past decade, while the percentage of 18-year-olds who report difficulty thinking and concentrating jumped in the same period. A Financial Times article about these findings proposed a shocking but relevant question: “Have humans passed peak brain power?”

Many of these declines in cognitive skills became notable starting in the mid-2010s, exactly the period when smartphones became ubiquitous and the digital attention economy exploded in size. An increasing amount of research implies that this timing is no coincidence. A meta-analysis released last fall showed that consuming short-form video content, as delivered by apps like TikTok and Instagram, is associated with poorer cognition and reduced attention, and the results of a clever experiment from 2023 found that the mere presence of participants’ smartphones in a room significantly reduced their ability to concentrate.

The growth of A.I. has brought new cognitive concerns. A study from January, based on surveys and interviews with more than 600 participants, revealed a “significant negative correlation between frequent A.I. tool usage and critical thinking abilities.” Another recent study, which tracked the brain activity of research subjects who were writing with the help of large language models, found that “brain connectivity systematically scaled down with the amount of external support.” [Continue reading…]