Amanda Montell casts a wide net in her new essay collection. Maybe too wide.

(One Signal)

Every generation has its own crisis, the linguist and podcaster Amanda Montell writes. In the 1960s and ’70s, young Americans organized against “physical tyrannies” such as voter suppression and workplace discrimination. But times have changed.

The 21st century brought a shift in our attention from external threats to internal ones, Montell says. Rates of anxiety and depression among U.S. teens and adults have spiked. Loneliness is a public health threat. We’re glued to our phones, alienated from loved ones and surrounded by misinformation.

People everywhere, Montell writes, are facing a crisis of the mind.

From this grim landscape emerges “The Age of Magical Overthinking: Notes on Modern Irrationality,” Montell’s third book and a sweeping look at mental health, behavioral science, misinformation and online culture in the 2020s. In it, she argues that the ills of the internet era are best explained by looking back on humanity’s history, when our minds developed shortcuts to improve our odds of survival. Those shortcuts are called cognitive biases, and they may lead us to do strange things like fall for a conspiracy theory or accept mental health advice from an untrained influencer.

Montell leads us through an engaging roundup of “21st century derangement,” from celebrity worship to tradwife discourse, examining how cognitive biases may contribute. But by positioning her work as a response to America’s broad struggle with mental health, Montell promises more than she delivers. Rather than focusing on a tour of our shared cognitive glitches, she juggles meta-commentary on such vast topics as the modern mind and the internet, dropping balls along the way.

The book opens with an account of Montell’s struggles with anxiety and overwhelm, as well as the steps she took to feel better. “My most cinematic attempt at mental rehab involved picking herbs on a farm in Sicily under a light-pollution-free sky,” she writes.

Eventually, she had an aha moment: The same cognitive biases she encountered while researching toxic social groups for her second book, “Cultish,” could explain why the internet age felt like a “mass head trip.” Glutted with more information in a day than we can ever hope to process, we fall back on mental habits developed when humans were simpler creatures, Montell writes. For example, social media celebrity worship could be fueled by the “halo effect,” where we assume a person with one good quality (writing hit pop songs) has other good qualities (a perfectly tuned moral compass). Or perhaps we spend hours comparing ourselves with other people on Instagram because the “zero-sum bias” has convinced us that life is a game of winners and losers.

Amanda Montell. (Kaitlyn Mikayla)

Montell backs up her connections in many instances with nods to evolutionary biology. For early humans, it made sense to attach ourselves to the strongest and most powerful, so now we glom onto Taylor Swift or Charli XCX. Resources like mates and status were limited in ancient human communities, Montell notes, so it’s natural that we view hot people on Instagram as immediate threats to our survival.

Montell finds examples of cognitive bias in internet culture flash points, such as the millennial obsession with New Age therapy-speak. Faced with big problems, such as anxiety or depression, our minds seek big explanations, such as childhood trauma or a scarcity mind-set, rather than examining all the smaller problems at play.

In other spots, she shares stories from her own life. In her late 20s, she struggled to end an abusive relationship, terrified that giving up meant she’d wasted years of her life — a classic “sunk cost fallacy.” Humans are social creatures, Montell notes, afraid of inviting scrutiny by admitting mistakes.

“My hope is for these chapters to make some sense of the senseless,” Montell says early on. “To crack open a window in our minds, and let a warm breeze in.” And indeed, in some moments, her sharp descriptions of behavioral foibles and her talent for cutting through doublespeak clear room for hope: Maybe noticing our warped thinking will make its effects less painful. Maybe our generational “crisis” is a story of not-enough-neurons encountering too-many-terabytes.

When confidence in Montell’s analysis wavers, it’s because the targets are too broad, the claims imprecise. For instance, we’re never quite sure of the shape of the national mental health crisis she repeatedly references. Early on, she draws a distinction between Americans’ current mental health struggles and 20th-century battles against bodily oppression. This neat separation doesn’t reflect reality — “The Age of Magical Overthinking” was published after Dobbs v. Jackson Women’s Health Organization and during ongoing fights for voter access, health care and the right to protest. It also doesn’t reflect what science has shown about illnesses like depression, which are often tied up with a person’s physical and political well-being. Ultimately, we’re left with the sense that Montell’s crisis of the mind begins and ends with the vague feelings of anxiety and dread many people feel after scrolling on social media apps.

Montell implies that the breakdown of Americans’ mental health began after 2000, brought on by internet access and introspection. Conflating “the internet” with social media, she draws loose connections between online scrolling and mental turmoil, making no reference to the complicated science around how social media use affects our brains. Some studies have found bumps in anxiety and depression associated with social media use, but more recent meta-analyses call their methods and findings into question. To date, researchers have found no consistent causal link between spending time on social apps and experiencing symptoms of depression and anxiety.

Of course, future research may uncover new ways to measure how social media use or other online activities affect the mental health of different populations. Perhaps we should rely on a different measure altogether, like qualitative research into young people and their families. Rather than critique the existing science or offer an alternative lens, Montell picks two studies that support her thesis and hand-waves at the dire state of things.

Finally, although Montell says cognitive biases affect everyone, she aims her jabs at the safest of targets: “Disney adults,” “male girlbosses,” “Facebook-addicted Karens.” Readers hoping for fresh or counterintuitive takes on internet culture — and its heroes and villains — may walk away disappointed.

Montell says from the jump that her analysis of 2020s malaise is “not a system of thought,” likening her work instead to a Buddhist koan — meant to be pondered, not understood. That’s fine, and “The Age of Magical Overthinking” ultimately features interesting topics, fun research and vivid stories. But in Montell’s effort to critique the spirit of our times, she asks imprecise questions and offers unsatisfactory answers.

Tatum Hunter is a consumer technology reporter at The Washington Post based in San Francisco. Her work focuses on health, privacy and relationships in the internet era.

The Age of Magical Overthinking

Notes on Modern Irrationality

By Amanda Montell

Atria/One Signal. 272 pp. $28.