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You’re on the checkout page when something appears in your shopping basket that you didn’t put there — say you’re buying a laptop, but insurance sneaks in, too, unless you uncheck a box.

Or you think you’re signing up for a one-time deal or even a free trial, but you’ve unintentionally committed to a subscription with recurring fees.

Maybe your relaxed online browsing session takes on an air of urgency because a countdown timer tells you that a hot deal is about to expire, or the site gives you an “almost out of stock” warning.

Perhaps you succumb to a fear of missing out after reading testimonials (of unknown origin) or seeing periodic messages that someone else (who might not be real) just bought the item you’re considering.

Not all of these “nudges” are flat-out deceptive. But all are instances of dark patterns, or website designs meant to steer, coerce or deceive people into making unintended or potentially disadvantageous decisions.

Dark patterns have been a topic of discussion among techies, behavioral scientists and marketers since 2010, when British cognitive scientist Harry Brignull coined the term. His website, darkpatterns.org

, serves as an information clearinghouse and a dark pattern Hall of Shame.

15 ways to get snookered

A new study by Princeton University researchers documents how ubiquitous dark patterns can be and explains why we fall for them.

Using a web crawler, the Princeton researchers investigated more than 11,000 shopping websites. They found 1,841 dark patterns on more than 11% of the sites (i.e., more than 1,200 of them). The researchers identified 15 patterns in seven broad categories, including sneaking, urgency and misdirection.

The more popular the website, the more likely it was to feature dark patterns. The most egregious examples, deemed “deceptive” by the researchers, were relatively rare: only 234 instances on 183 websites.

The authors note, however, that their limited study — for example, they analyzed only text (no images) and only on retail sites — no doubt understates the prevalence of dark patterns.

Why these tricks work

We fall for the trickery because of innate cognitive biases. We might go ahead with a transaction even after a previously undisclosed charge gets added at the last minute because of a bias known as the sunk-cost fallacy — the feeling that we’ve invested too much time, energy or money to turn back.

And something known as the framing effect makes “confirm shaming” a common pattern for some sites. You’ve seen it when a shopping site promises a discount in exchange for your email address. If you don’t want to give it out, you’re forced to click on something like, “No thanks, I like paying full price.”

Once aware of dark patterns, we tend to adapt. Some 65% of British consumers in a recent survey pegged instances of dark patterns on a hotel booking site as the sales pressure they are.

But the frontiers keep expanding. You’ll find dark patterns on mobile apps, video games and social media platforms, too.

Congress has taken notice: A bill introduced in the Senate in April would empower the Federal Trade Commission to crack down on dark patterns.

“My bigger concern is how dark patterns play out in other contexts,” said Colin Gray, an assistant professor in the computer graphics technology department at Purdue University.

“There’s a whole new range of deceptive practices that could be present in non-screen-based dark patterns,” he said, such as in smart-home speakers and other devices.

The best defense is to cultivate your inner skeptic when it comes to shopping online, and read — yes, actually read — user agreements, Gray said. “Realize that not everyone is acting with good intent, even companies that we respect.”

© 2019 The Kiplinger Washington Editors, Inc. Distributed by Tribune Content Agency, LLC.