"Our findings show that 13-month-olds can make sense of social situations using their understanding about others' minds and social evaluation skills," said psychological scientists and study authors You-jung Choi and Yuyan Luo of the University of Missouri.
"The research is innovative in that we show that infants are able to construe social situations from different participants' perspectives," they said.
The researchers were interested in how information, or lack thereof, can affect our social interactions with others.
They brought 48 infants, who were around 1 year old, into the lab for their experiment. The infant sat on his or her parent's lap, facing a little stage where hand puppets would appear.
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Then, the infants were presented with a particular social scenario. In one, the infants saw a third puppet, C, approach and get deliberately knocked down by B, as A looked on from the side.
In another scenario, B knocked down C, but A wasn't present. And in a third scenario, C was accidentally knocked down as A looked on.
Choi and Luo wanted to know how the infants would respond to subsequent interactions between A and B, given what they had seen.
So, if A was a witness to the deliberate hit, the infants seemed to expect A to shun B. They spent more time looking at the puppets when A was "friendly" with B after the hit (wiggling and swaying together) than when A ignored B, suggesting that the friendly interaction was an unexpected turn of events.
"This to us indicates infants have strong feelings about how people should deal with a character who hits others: even his or her acquaintance or 'friend' should do something about it," researchers said.
When the hit was an accident, the infants spent about the same time looking at the puppets in the two outcomes - they seemed to respond to the friendly outcome and unfriendly outcome as equally reasonable.
According to Choi and Luo, these results suggest that young children are developing skills that enable them to assess social situations and make relevant social judgments earlier than many would assume.