In this episode we explore prevalence induced concept change with psychologist David Levari.

In a nutshell, when we set out to change the world by reducing examples of something we have deemed problematic, and we succeed, a host of psychological phenomena can mask our progress and make those problems seem intractable — as if we are only treading water when, in fact, we’ve created the change we set out to make.

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When you think about your future health, career, finances, and even longevity — you imagine a rosy, hopeful future. For everyone else, though, you tend to be far more realistic.

In other words, if you are a smoker, everyone else is going to get cancer. You’ll probably be in the that lucky portion who smokes into your 90s, or so you think. Similarly, the odds of success for a new restaurant change depending on who starts that venture. If its you, the odds are pretty good. If it is someone else, you see the odds as pretty bad.

In this episode we sit down with psychology legend Richard Petty to discuss the Elaboration Likelihood Model, a theory he developed with psychologist John Cacioppo in the 1980s that unified the study of attitude change and persuasion and has since become one of the most robust models for explaining how and why some messages change people’s minds, some don’t, as well as what makes some stick and others fade in influence over time.

Dinner parties used to be where you avoided politics. Now talking about politics at dinner parties is the norm.

Years ago, we avoided politics because we assumed the people at our table had diverse political identities, and we didn’t want to introduce a topic that might lead to an argument. Today, we assume our guests share a single identity, after all, why else would we have invited them?

Something has changed in the United States, and for many of us, it’s only at Thanksgiving dinner, a gathering where we don’t get to sort ourselves by political tribe, that we must face people who see the world differently than ourselves.

In 1990, psychologist Walter Michel’s and his team released a landmark study into delayed gratification.

They offered kids a single marshmallow now, or two marshmallows later if they could resist temptation for 20 minutes. They found that the children who could wait were more likely to be successful later in life. They had higher test scores on the SAT, lower divorce rates, higher incomes, lower body mass indexes, and fewer behavioral problems as adults.

Today, if you go to YouTube and search for “The Marshmallow Test” you will find thousands of videos in which parents test their children to see if they can wait for the marshmallow. It’s understandable, because throughout the early 2000s, a slew of TED talks, popular books, and viral articles suggested that you could use the test to portend your child’s chances at reaching their life goals — and its fun and easy and you can eat all the extra marshmallows.

The marshmallow test is now one of the most well-known studies in all of psychology, right up there with the Milgram shock experiments and the Stanford prison experiment, but a new replication suggests we’ve been learning the wrong lesson from its findings for decades.