What Is Happening in Children’s Brains When They Are Playing Pretend?

Our brains are active while we learn, work, and even play! We wanted to find out what parts of the brain kids use when they play with dolls. Because pretend play with dolls might involve imagining how other people act and feel, we thought that the areas of the brain used for thinking about other people might be particularly important during doll play. If this is true, do kids use these parts of the brain in all types of pretend play or is there something special about playing with dolls? Are the brain regions that are important for thinking about other people used in the same way when playing with an iPad vs. with dolls? Do kids use the social parts of their brains when playing pretend on their own, or only with a friend? Let us talk about what we found!

Our brains are active while we learn, work, and even play! We wanted to find out what parts of the brain kids use when they play with dolls. Because pretend play with dolls might involve imagining how other people act and feel, we thought that the areas of the brain used for thinking about other people might be particularly important during doll play. If this is true, do kids use these parts of the brain in all types of pretend play or is there something special about playing with dolls? Are the brain regions that are important for thinking about other people used in the same way when playing with an iPad vs. with dolls? Do kids use the social parts of their brains when playing pretend on their own, or only with a friend? Let us talk about what we found! Figure   Figure The posterior superior temporal sulcus (pSTS) is the area of the brain that is associated with developing social understanding and empathy.

WHEN YOU THINK OF PLAY, WHAT DO YOU THINK OF?
Play can take many di erent forms: fantasy or pretend play, games with rules, word play, construction play, or all of them combined into one. Play is simply something children find fun. One of the most common forms of play is pretend play, in which we create a playful,

PRETEND PLAY
Play in which we create a playful version of our own reality, for fun. imaginary version of our world for fun. Pretend play is really common when children play with toys, particularly dolls. Doll play is particularly exciting because you can still have fun whether you play alone or with someone else. Some research has shown that pretend play with others is useful for improving our social skills. In other words, while the play is not "real" to us nor our friend, it does allow us to practice real social skills, like recognizing when our friend is pretending, and practicing how to respond to the various emotional reactions of another person. Some other experiments have found that pretend play allows children to explore their own feelings and emotions, and to learn about EMPATHY The ability to feel or understand the experiences of another person.
empathy [ ]. Empathy is the ability to "put yourself in someone else's shoes," to understand how they might be feeling in a certain situation. For example, you might understand that your friend probably feels sad when someone takes his or her favorite toy away. Empathy is very important when it comes to understanding others' feelings and desires, and it is the first step toward helping other people feel better.
To learn more about empathy, you can read this Frontiers for Young Minds article.
Past research has found that there is a particular area of the brain that is especially important in helping us to know when to show empathy. That brain area is the posterior superior temporal sulcus POSTERIOR

SUPERIOR TEMPORAL SULCUS (PSTS)
A part of the brain associated with developing social understanding and empathy.
(pSTS) (Figure ) and, in our study, we collected data from this brain region to see what happened during pretend play [ , ]. Our study was unique because we studied children who were either playing with a play-partner (joint play) or alone (solo play), to see if playing with a partner a ects a child's ability to gain and use various social skills. To investigate these questions, we decided to measure children's brain activity during live, natural play. Think of this as having a live recording of what is happening in your brain while you are playing.  Figure To study the brain using fNIRS, a stretchy cap with light sources and detectors is placed on the child's head. The cap shines near-infrared light into the brain to see which parts are active while the child is playing. fNIRS recording is a safe, pain-free process. The yellow arcs in the picture show where the light travels through the brain.

HOW DID WE STUDY THE BRAIN DURING PRETEND PLAY?
To see which areas of the brain were active during pretend play, we used a technique called functional near-infrared spectroscopy FUNCTIONAL

NEAR-INFRARED SPECTROSCOPY (FNIRS)
A technique that uses near-infrared light to measure blood flow in the brain. Regions that are active need more blood.
(fNIRS). Researchers put a special stretchy cap on the children they are studying. By shining a special kind of light, called near-infrared light, through the skin, bone, and brain, this cap can detect which parts of the brain are being used ( Figure ). Although this may sound scary, near-infrared light is much like the other types of light that we experience in our daily lives and is perfectly safe and painless. As this light passes through the head, some of it is absorbed by the blood flowing through the brain. When our brains are active, they require oxygen from the bloodstream. So, the harder a particular area of the brain is working, the more oxygenated blood will be sent to that area and the more light will be absorbed there. Because the fNIRS cap measures how much light comes back out of the brain, the areas with less light shining through them are the most active. To learn more about fNIRS, see this article. fNIRS was a good technique to choose for our study, because it does not require the person being studied to hold still for brain activity to be measured. This was helpful, because it allowed us to see what was happening in the brain as kids moved around to talk and play with toys, the way they normally would [ ].
We hoped to answer three main questions with our research. First, we wanted to know whether the pSTS was active during pretend play. If so, would the pSTS be more active when the child was playing pretend alone vs. with someone else? Last, we wondered whether the type of toy being used during pretend play influences which brain areas are activated.

HOW DID WE ANSWER OUR QUESTIONS?
We invited children between and years old to participate in our study. We were able to collect full fNIRS data from of the participants. Each participant was asked to play two types of games: tablet games and doll games. We had two di erent tablet games (a city-building game and a hair-dressing game), and four di erent sets of dolls: a family set, a careers set, a house set, and an animals set.
Each segment involved min of rule-free, creative, play. Between segments, we showed participants a -s video containing pictures of vegetables, as a reset before the next play segment ( Figure A). During the joint doll and joint tablet segments, the children were given dolls or a tablet game to play with, and the experimenter was allowed to play with them. During the solo doll and solo tablet segments, the experimenter just observed while the children played on their own. kids.frontiersin.org December | Volume | Article | WHAT DID WE FIND?
As we mentioned earlier, the pSTS is associated with developing social understanding and empathy. In this case, social understanding refers to the way we can build relationships with other people by noticing and responding to their social cues, like expressions, body language, and tone of voice. In our study, we wanted to see if the pSTS was active when kids were playing pretend with someone else and/or when they were playing pretend alone. We saw that the pSTS was activated during all types of pretend play. We also wanted to see if play with dolls activated the pSTS region more than play with a tablet. On average, pretend play with the dolls was associated with greater activation of the pSTS than pretend play with the tablet. Our results also showed that when children are playing with someone else, the pSTS is activated to a very similar degree, regardless of whether they are playing with dolls or with a tablet. However, during solo play, there was greater activation of the pSTS when children were playing with dolls as opposed to a tablet ( Figure B). We found these results for both boys and girls, and across all the ages we assessed.

WHY IS THIS IMPORTANT?
fNIRS brain imaging confirmed our hypothesis that an area of the brain known to play a role in social understanding and empathy, the pSTS, was active during pretend play. Interestingly, we saw that the pSTS was not only active when kids were playing pretend with someone else, but also when they were playing pretend on their own! This is an intriguing new finding, because it suggests that playing pretend with friends may not be the only way for children to further develop their capacity for empathy and social understanding. However, we also found that the type of toy children play with on their own a ects how much the pSTS is activated. The pSTS was more activated during solo play with dolls than during solo play with a tablet. Our finding that solo doll play, rather than solo tablet play, activates the pSTS more suggests that dolls are better suited to help children develop these social skills than are imaginative, open-ended tablet games.
These results are important because they suggest that playing with dolls by ourselves is one way we can practice important social skills like empathy. However, there is still a lot of research that needs to be done into why certain types of toys activate the pSTS more than others. Maybe you can be the future researcher who helps us figure it out!
. Using light to understand how the brain works in the classroom. Front Young Minds. : . doi: . /frym. .

CONFLICT OF INTEREST:
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
Funding for this project was provided by Mattel Inc ® ; through partnership with Oxy Insight Ltd. Mattel and Oxy Insight funded the equipment and some personnel for this project and were involved in initial discussions regarding the study design. Neither Mattel or Oxy Insight had final say in the study design nor played a direct role in the collection or analysis of the data; interpretation of the results; or writing of the manuscript.
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