Kanngiesser, P., Gjersoe, N., & Hood, B. M. (2010). The effect of creative labor on property-ownership transfer by preschool children and adults. Psychological Science : A Journal of the American Psychological Society / APS, 21(9), 1236–1241.
Another important study by Kanngiesser.
Let me first paste the abstract:
“We investigated whether preschool children and adults believe that ownership of one person’s property is transferred to a second person following the second person’s investment of creative labor in that property. In our study, an experimenter and a participant borrowed modeling-clay objects from each other to mold into new objects. Participants were more likely to transfer ownership to the second individual after he or she invested creative labor in the object than after any other manipulations (holding the object, making small changes to it). This effect was significantly stronger in preschool children than in adults. Duration of manipulation had no effect on property-ownership transfer. Changes in the object’s identity acted only as a secondary cue for children. We conclude that ownership is transferred after an investment of creative labor and that determining property ownership may be an intuitive process that emerges in early childhood.”
First reflection: even though from our theoretical point of view we like to distinguish between things like “creation”, “discovery” or “transformation though the investment of labor”, maybe these are not too different from each other from the point of view of the child. That is, in all these cases, there is an agent that develops a purposeful and laborious activity on the object that is transformed as a result; and that is transformed into something that is either beautiful, or useful, or has value in some way. So children (and humans in general) understand that value is created through an agent’s activity. (This is Locke’s thesis, and it’s also part of our common sense). Once you think about it in this terms, it makes sense that children don’ pay attention to things like “duration of possession” or minor manipulations of the object; they don’t follow such mechanistic criteria, they look at transformations that make sense.
This paper, therefore, does not belong to the topic of “ownership transfer” but to the topic of “ownership claims”, in my opinion. If you take the duck and make an ashtray, you might say that the ownership of the play dough was transferred. But you can also say that you destroyed the duck and created an ashtray. You are the owner of the object you created (ownership principle).
“When asked to justify their property ownership decisions, 3-year-olds never mentioned creative labor, whereas 4-year-olds justified ownership transfers with explicit reference to creative investment. Moreover, we found that for children, the main component of creative labor was the invested effort, and the secondary component of creative labor was changing an object’s identity.” “We found that this transfer overruled an established bias to assign ownership to the individual who first possessed an object.”
“We found that children transferred ownership more frequently after making small changes to another person’s object than after possessing the same object, a result suggesting that children’s ownership judgments may even be finely calibrated to the amount of effort invested in an object.”
Creative labor has an effect on ownership judgments in adults, but the effect is less pronounced in adults than in children.