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Office of Neuroscience Research > WUSTL Neuroscience News > Infants know what we like best, study finds

Infants know what we like best, study finds



From the WashU Newsroom... 

Behind the chubby cheeks and bright eyes of babies as young as 8 months lies the smoothly whirring mind of a social statistician, logging our every move and making odds on what a person is most likely to do next, suggests new research in the journal Infancy.

“Even before they can talk, babies are keeping close track of what’s going on in front of them and looking for patterns of activity that may suggest preferences,” said study co-author Lori Markson, associate professor of psychological and brain sciences in Arts & Sciences and director of the Cognition & Development Lab at Washington University in St. Louis. “Make the same choice three or four times in a row, and babies as young as 8 months come to view that consistent behavior as a preference.”

The findings demonstrated that infants look for consistent patterns of behavior and make judgments about people’s preferences based on simple probabilities calculated from observed events and actions.

Co-led by Yuyan Luo, an associate professor of psychological sciences at the University of Missouri-Columbia, the study may shed light on how infants and young children learn about people’s preferences for a certain kind of food, toy or activity. It also might explain why kids always seem to want the toy that someone else is playing with.

“Consistency seems to be an important factor for infants in helping them sort out what’s happening in the world around them,” Markson said. “Our findings suggest that, if a person does something different even a single time, it undoes the notion of someone having a clear preference and changes an infant’s expectations for that individual’s behavior. In other words, if you break the routine, all bets are off in terms of what they expect from you.”

The findings confirmed that infants as young as 8 months already are developing the ability to see the world through someone else’s eyes, to sense what another person may or may not know, think or believe about a situation.

Because babies can’t tell us what they’re thinking, researchers had previously speculated that the ability to see life from someone else’s perspective did not develop until about 4  years of age. But more recent research over the past decade gets around this spoken-language barrier by relying on a proven premise — that babies spend much more time looking at events they consider to be new and unusual.

In this study, Markson and Luo conducted a series of experiments to track how infant “looking times” changed when an actor made an unexpected choice between one of two stuffed-animal toys displayed before the infant on a small puppet stage.

They corroborated these findings using a similar experiment that tracked whether infants, when asked to give a toy to the actor, would reach more often for the toy consistently chosen by the actor in previous trials, thus implying that the infant understood the actor’s preference.

The experiments were conducted on a sample of 60 healthy, full-term infants with an even split of males and females ranging in age from 7 to 9  months and an average age of 8 1/2 months.

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