Targeting an audience of monkeys

Specifics of the ad, thought to be the first aimed at nonhumans, are under wraps, but the concept is familiar: Sex sells. Or, in this case, racy images of Capuchin monkeys sell.

If the monkeys are swayed by the campaign - a big if - it could help explain why people’s preferences are influenced so easily. We may simply be hardwired to succumb to the allure of attractive people hawking luxury cars and fancy perfumes.

“I think one of the worries is that if we’re really built to process information in this way, it’s going to be harder to override those processes than we think,’’ said Laurie Santos, an associate professor of psychology at Yale who is leading the project.

For years, researchers have been testing whether elements of complex human cognitive abilities, from language to altruism, are shared by other animals, and in many instances they have found we are less distinct than once thought. Santos and others are interested in the evolutionary origins of a less admirable set of traits - the biases in our thinking that can lead us to make bad decisions about money, such as overestimating the value of objects, or poorly assessing risk.

The biases could be biologically ancient, predating the human use of money, said Michael Platt, director of the Center for Cognitive Neuroscience at Duke University, “or there’s something deep and strange about this monetary currency that leads to a whole host of irrational biases, because our brains are not equipped to deal with money.’’ Like Santos, Platt hopes to plumb aspects of human behavior by showing ads to monkeys.

Santos began the work years ago, by setting up a Capuchin monkey marketplace in her lab at Yale. In collaboration with economist Keith Chen, she taught monkeys to use metal discs as currency to purchase apple slices, grapes, or gelatin cubes. The monkeys acted much like human shoppers, the researchers reported, taking advantage of sales and trying to avoid losses.

Then, the researchers conducted experiments to see whether the monkeys made the same kinds of irrational economic decisions that people often do.