Researchers said even young kids can override direct requests in deciding the best way to help someone else achieve their goals.
They observed examples of such "paternalistic helping" in children who, in one example from the study, chose to give a fully functional cup when asked for a broken one to pour liquid.
"Our study forces kids to show what their abilities are and shows that kids are actually able to override obvious goals and go for that thing that actually helps the person," said study lead author Alia Martin from the Yale University.
They then asked the kids to hand over certain objects after stating one of four goals: pouring water, writing a note, putting the note on a wall and making a phone call.
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More than two thirds of the time, when researchers requested a dysfunctional object, the child handed over the functional one instead, the report said.
Researchers then asked children to give them objects that would ultimately be thrown out.
They found that the subjects were equally likely to give functional and dysfunctional objects.